Ex. PGS 1083
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`
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`

`
`United States Patent [I9]
`Pearson
`United States Patent
`
`[191
`
`[ 75 ]
`
`Pearson
`[54} NON-ROTATING DEPTH CONTROLLER
`PARA VANE FOR SEISMIC CABLES
`[54] NON-ROTATING DEPTH CONTROLLER
`Inventor: Raymond H. Pearson, Richardson,
`PARAVANE FOR SEISMIC CABLES
`Tex.
`Inventor: Raymond H. Pearson, Richardson,
`[75]
`[73) Assignee: Whitehall Electronics,
`Tex.
`Richardson, Tex.
`[73] Assignee: Whitehall Electronics,
`Jan. 25, 1972
`[22] Filed:
`Richardson, Tex.
`[21} Appl. No.: 220,592
`[22]
`Filed:
`Jan. 25, 1972
`
`[56]
`
`[2]] Appl. No.: 220,592
`[52) U.S. Cl. .................. .. ............... ... ....... 114/235 B
`Int. Cl. ............................. .......... ..... B63b 21/00
`[ 5 l]
`[52] U.S. Cl.............................................. 114/235 B
`[58] Field of Search ......... ........ . 114/235 B; 340/7 R
`[51]
`................ B63!) 21/00
`[58] Field of Search .................. 114/235 B; 340/7 R
`References Cited
`References Cited
`[56]
`UNITED STATES PATENTS
`UNITED STATES PATENTS
`8/1972 Smith .............................. 114/235 B
`3,680,520
`8/1972
`Smith .............................. 114/235 B
`3,680,520
`3,375,800
`4!1968 Cole et al... ..................... 114/235 B
`4/1968 Cole et al........................ 114/235 B
`3,375 .800
`Primary Examiner-Milton Buchler
`Primary Examiner——Milton Buchler
`Assistant Examiner-Stuart M. Goldstein
`Assistant Examiner—Stuart M. Goldstein
`Attorney-Thomas B. Van Poole et al.
`Attorney——Thomas B. Van Poole et al.
`
`3,774,570
`[II]
`[45] Nov. 27, 1973
`[111
`3,774,570
`
`[57]
`
`[451 Nov. 27, 1973
`ABSTRACT
`
`A non-rotating depth controller paravane for seismic
`[57]
`ABSTRACT
`cable streamers wherein the paravane includes a body
`having a central bore extending the length thereof
`A non-rotating depth controller paravane for seismic
`through which the seismic cable extends with the
`cable streamers wherein the paravane includes a body
`paravane latched in non-rotatable relation to the seis(cid:173)
`having a central bore extending the length thereof
`mic cable. The paravane includes three or more pivot(cid:173)
`through which the seismic cable extends with the
`ally mounted diving planes, four being shown in the
`paravane latched in non-rotatable relation to the seis-
`mic cable. The paravane includes three or more pivot-
`illustrated example, and electronic circuitry and servo
`ally mounted diving planes, four being shown in the
`means for sensing differences between a command sig(cid:173)
`illustrated example, and electronic circuitry and servo
`nal and a depth indicating signal derived from a pres(cid:173)
`means for sensing differences between a command sig-
`sure transducer on the paravane and activating the
`nal and a depth indicating signal derived from a pres-
`servo system to position the diving planes to cause the
`sure transducer on the paravane and activating the
`paravane to climb or dive regardless of its orientation
`servo system to position the diving planes to cause the
`about the roll axis and without movement of the para(cid:173)
`paravane to climb or dive regardless of its orientation
`vane in yaw. Gravity sensing potentiometers vary the
`about the roll axis and without movement of the para-
`control signals to the servo system to activate the div(cid:173)
`vane in yaw. Gravity sensing potentiometers vary the
`ing planes in this manner regardless of the orientation
`control signals to the servo system to activate the div-
`of the paravane about the roll axis.
`·
`ing planes in this manner regardless of the orientation
`of the paravane about the roll axis.
`
`13 Claims, 15 Drawing Figures
`13 Claims, 15 Drawing Figures
`
`-=-------=--.2
`
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`PATENTED NOV 271973
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`1
`2
`NON-ROTATING DEPTH CONTROLLER
`as needed to cause the depth controller to maintain a
`3,774,570
`PARA VANE FOR SEISMIC CABLES
`desired depth or to cause it to climb or go deeper in re(cid:173)
`1
`2
`sponse to command signals.
`BACKGROUND AND OBJECTS OF THE
`NON-ROTATING DEPTH CONTROLLER
`as needed to cause the depth controller to maintain a
`Another object of the present invention is the provi-
`PARAVANE FOR SEISMIC CABLES
`INVENTION
`desired depth or to cause it to climb or go deeper in re-
`5 sion of a depth controller for seismic cables or stream(cid:173)
`sponse to command signals.
`BACKGROUND AND OBJECTS OF THE
`The present invention relates in general to marine
`ers as described in either of the two preceding para(cid:173)
`Another object of the present invention is the provi-
`INVENTION
`seismic cable systems having means for maintaining the
`graphs, together with transformer means for communi(cid:173)
`sion of a depth controller for seismic cables or stream-
`seismic cable or seismic streamer at a pre-determined
`cating with the seismic cable and means for providing
`The present invention relates in general to marine
`ers as described in either of the two preceding para-
`depth, and more particularly to a paravane structure
`pressure transducer readout to the towing vessel to per(cid:173)
`seismic cable systems having means for maintaining the
`graphs, together with transfonner means for communi-
`adapted to be non-rotatably linked to the seismic cable 10
`mit monitoring of the towing depth.
`seismic cable or seismic streamer at a pre-determined
`cating with the seismic cable and means for providing
`streamer at a plurality of regular intervals to maintain
`Other objects, advantages and capabilities of the
`depth, and more particularly to a paravane structure
`pressure transducer readout to the towing vessel to per-
`the streamer at a selected depth and which responds to
`adapted to be non-rotatably linked to the seismic cable
`present invention will become apparent from ·the fol(cid:173)
`mit monitoring of the towing depth.
`streamer at a plurality of regular intervals to maintain
`depth command signals from the towing vessel to regu(cid:173)
`Other objects, advantages and capabilities of the
`lowing detailed description, taken in conjunction with
`the streamer at a selected depth and which responds to
`late the streamer depth notwithstanding rotation or
`present invention will become apparent from the fol-
`the accompanying drawings illustrating preferred em(cid:173)
`depth command signals from the towing vessel to regu-
`lowing detailed description, taken in conjunction with
`twisting of the cable and the paravanes linked thereto. 15
`bodiments of the invention.
`late the streamer depth notwithstanding rotation or
`the accompanying drawings illustrating preferred em-
`Heretofore, various systems have been devised for
`I5
`bodiments of the invention.
`twisting of the cable and the paravanes linked thereto.
`BRIEF DESCRIPTION OF THE FIGURES
`maintaining the hydrophones or transducers in a seis-
`Heretofore, various systems have been devised for
`BRIEF DESCRIPTION OF THE FIGURES
`FIG. 1 is a side elevation view of the paravane depth
`mic cable or streamer at selected depths when used in
`maintaining the hydrophones or transducers in a seis-
`controller for a seismic cable or streamer, constructed
`marine seismic operations. In general, the seismic cable
`mic cable or streamer at selected depths when used in
`FIG. 1 is a side elevation view of the paravane depth.
`or streamer may constitute a seismic detector cable 20 in accordance with the present invention;
`controller for a seismic cable or streamer, constructed
`marine seismic operations. In general, the seismic cable
`constructed substantially as disclosed in U.S. Pat. No.
`FIG. 2 is a front elevation view of the paravane depth
`or streamer may constitute a seismic detector cable
`in accordance with the present invention;
`_
`2,465,699 issued Mar. 29, 1949 to Leroy C. Paslay. A
`controller;
`constructed substantially as disclosed in U.S. Pat. No.
`FIG. 2 is a front elevation view of the paravane depth
`controller;
`2,465,699 issued Mar. 29, 1949 to Leroy C. Paslay. A
`FIG. 3 is a longitudinal section view of the depth con-
`marine seismic detector cable may in many cases be a
`marine seismic detector cable may in many cases be a
`FIG. 3 is a longitudinal section view of the depth con-
`troller taken along the line 3-3. of FIG. 2;
`mile or more in length, and the efficiency of the seismic
`mile or more in length, and the efficiency of the seismic
`troller taken along the line 3-3,01‘ FIG. 2;
`survey is affected to a large degree by the ability to 25
`FIG. 4 is a top plane view showing the two halves of
`25
`survey is affected to a large degree by the ability to
`FIG. 4 is a top plane view showing the two halves of
`maintain the various hydrophones along the length of
`the paravane opened away from each other about their
`maintain the various hydrophones along the length of
`the paravane opened away from each other about their
`the cable at the same pre-determined depth.
`interconnecting hinge;
`interconnecting hinge;
`the cable at the same pre—detennined depth.
`FIG. 5 is a vertical transverse section view taken
`Efforts have been made to maintain the cable at a se-
`FIG. 5 is a vertical transverse section view taken
`Efforts have been made to maintain the cable at a se-
`along the line 5-5 of FIG. 3, with the diving planes re-
`lected pre-determined depth in the water, while the
`along the line 5-5 of FIG. 3, with the diving planes’ re-
`lected pre—detennined depth in the water, while the
`cable is being towed by the surveying vessel, by using 30 moved from their control shafts;
`moved from their control shafts;
`cable is being towed by the surveying vessel, by using
`a plurality of weights associated with the cable at
`FIG. 6 is a front view, to enlarged scale, of the sealed
`a plurality of weights associated with the cable at
`FIG. 6 is a front view, to enlarged scale, of the sealed
`spaced intervals to make the cable negatively buoyant
`cylinder which houses the electronics and servo mo-
`spaced intervals to make the cable negatively buoyant
`cylinder which houses the electronics and servo mo-
`and by associating flotation means with the cable to as-
`and by associating flotation means with the cable to as-
`tors, with certain internal components indicated in bro-
`tors, with certain internal components indicated in bro-
`ken lines;
`sist in maintaining the cable at the desired depth. More
`sist in maintaining the cable at the desired depth. More
`ken lines;
`recently, paravane structures such as that disclosed in.
`FIG. 7 is a longitudinal section view through the
`recently, paravane structures such as that disclosed in 35
`FIG. 7 is a longitudinal section view through the
`U.S. Pat. No. 3,375,800 to Jimmy R. Cole et al. or the
`sealed cylinder, taken along the line 7-7 of—FlG. 6;
`U.S. Pat. No. 3,375,800 to Jimmy R. Cole et al. or the
`sealed cylinder, taken along the line 7-7 of FIG. 6;
`type disclosed in U.S. Pat. No. 3,412,704 to Buller et
`FIG. 8 is a schematic diagram of the electrical cir-
`type disclosed in U.S. Pat. No. 3,412,704 to Buller et
`FIG. 8 is a schematic diagram of the electrical cir-
`al., have been proposed for regulating the depth of the
`cuitry of the depth controller paravane;
`al., have been proposed for regulating the depth of the
`cuitry of the depth controller paravane;
`seismic cable. Such depth controllers have been rotat-
`FIG. 9 is a section View of one of the gear box units
`seismic cable. Such depth controllers have been rotat-
`FIG. 9 is a section view of one of the gear box units
`ably secured to the cable by bearing means and have
`directly connected to the control shafts of the diving
`ably secured to the cable by bearing means and have 40 directly connected to the control shafts of the diving
`planes;
`_
`employed two diving planes, which are regulated in
`employed two diving planes, which are regulated in
`planes;
`preselected relation to pressure responsive devices in
`FIG. 10 is a side elevation of the connected pair of
`preselected relation to pressure responsive devices in
`FIG. 10 is a side elevation of the connected pair of
`the wall of the paravane to maintain a desired depth.
`gravity actuated potentiometers;
`-
`the wall of the paravane to maintain a desired depth.
`gravity actuated potentiometers; .
`FIGS. 11, 12, 13 and 14 are rear views of the depth
`Such prior art depth controllers, employing two diving
`45
`controller paravane in four different possible positions,
`planes, must always be positioned so that the two diving
`Such prior art depth controllers, employing two diving
`FIGS. 11, 12, 13 and 14 are rear views of the depth
`planes, must always be positioned so that the two diving 45 controller paravane in four different possible positions,
`with flie gravity actuated potentiometers schematically
`planes are horizontal, which is insured by the weighted,
`indicated thereon; and
`rotatable construction disclosed in such prior patents.
`with the gravity actuated potentiometers schematically
`planes are horizontal, which is insured by the weighted,
`It has been found highly desirable to provide non-
`FIG. 15 is a schematic diagram of part of the electri-
`rotatable construction disclosed in such prior patents.
`indicated thereon; and
`cal circuitry for a modified fonn of the depth control-
`rotatable depth controllers which are not alined in any
`It has been found highly desirable to provide non-
`FIG. 15 is a schematic diagram of part of the electri-
`ler.
`particular plane, as the seismic streamer cable twists
`rotatable depth controllers which are not alined in any
`cal circuitry for a modified form of the depth control-
`under tension and each depth controller may be af-
`particular plane, as the seismic streamer cable twists 50 Ier.
`DETAILED DESCRIPTION OF PREFERRED
`fected by the twisting of the streamer cable to cause the
`EMBODIMENTS
`under tension and each depth controller may be af-
`depth controllers to operate in different planes.
`DETAILED DESCRIPTION OF PREFERRED
`fected by the twisting of the streamer cable to cause the
`An object of the present invention, therefore, is the
`Referring to the drawings, wherein like reference I
`EMBODIMENTS
`depth controllers to operate in different planes.
`characters designate corresponding parts throughout
`provision of a paravane type depth controller for use
`with seismic cables or streamers, wherein the paravane
`the several figures, and particularly to FIGS. 1 through
`Referring to the drawings, wherein like reference
`An object of the present invention, therefore, is the
`7, there is illustrated a paravane 15 which is non-
`depth controller employs three or more diving planes
`characters designate corresponding parts throughout
`provision of a paravane type depth controller for use
`rotatably secured about a seismic cable or streamer in-
`which are regulated by servo systems carried in the
`the several figures, and particularly to FIGS. 1 through
`with seismic cables or streamers, wherein the paravane
`dicated at 16 in FIG. 3. The paravane 15 has a central,
`paravane and subject to command signals from the
`7, there is illustrated a para vane 15 which is non(cid:173)
`depth controller employs three or more diving planes
`axial bore 17 through which the seismic cable or
`towing vessel, and wherein the paravane is non-
`rotatably secured about a seismic cable or streamer in-
`which are regulated by servo systems carried in the
`streamer I6 is received, and is provided with bushings
`rotatably secured to the cable to maintain the adjacent
`60 dicated at 16 in FIG. 3. The paravane 15 has a central,
`paravane and subject to command signals from the
`18 within the bore near the leading and trailing ends
`portion of the cable at a preselected depth.
`axial bore 17 through which the seismic cable or
`towing vessel, and wherein the paravane is non(cid:173)
`thereof. As is more clearly illustrated in FIG. 3, a spe-
`Another object of the present invention is the provi-
`streamer 16 is received, and is provided with bushings
`rotatably secured to the cable to maintain the adjacent
`cial spacer 19 is incorporated into the streamer cable,
`sion of a depth controller paravane to maintain a seis-
`18 within the bore near the leading and trailing ends
`which is of slightly enlarged diameter relative to the di-
`portion of the cable at a preselected depth.
`mic cable or streamer at a desired depth, wherein the
`ameter of the cable to correspond closely to the diame-
`depth controller has three or more diving planes and
`thereof. As is more clearly illustrated in FIG. 3, a spe(cid:173)
`Another object of the present invention is the provi(cid:173)
`ter of the bore 17 and includes a socket for receiving
`control means to provide vertical or horizontal thrusts
`cial spacer 19 is incorporated into the streamer cable,
`sion of a depth controller paravane to maintain a seis- 65
`which is of slightly enlarged diameter relative to the di-
`mic cable or streamer at a desired depth, wherein the
`ameter of the cable to correspond closely to the diame(cid:173)
`depth controller has three or more diving planes and
`ter of the bore 17 and includes a socket for receiving
`control means to provide vertical or horizontal thrusts
`
`55
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`

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`3,774,570
`
`4
`3
`31 is properly positioned in the compartment 228' by
`a pin 20 projecting inwardly into the bore to provide
`3,774,570
`the tow point for the depth controller and retain the
`the pin 20 and the springs 32.
`3
`4
`The electrical and electronic circuitry incorporated
`depth controller in non-rotating relation to the cable.
`31 is properly positioned in the compartment 22B’ by
`in the sealed cylinder assembly 31 will be more clearly
`The spacer 19 also mounts the primaries of two trans(cid:173)
`a pin 20 projecting inwardly into the bore to provide
`the tow point for the depth controller and retain the
`the pin 20 and the springs 32.
`understood by reference to the schematic diagram of
`formers and the secondary of another transformer as 5
`The electrical and electronic circuitry incorporated
`depth controller in non-rotating relation to the cable.
`FIG. 8. As there shown, the AC supply conducted
`later described.
`in the sealed cylinder assembly 31 will be more clearly
`The spacer 19 also mounts the primaries of two trans-
`through the leads of the cable 16 to the transformer pri(cid:173)
`The paravane 15 includes a torpedo-like hull or body
`formers and the secondary of another transformer as
`understood by reference to the schematic diagram of
`mary 26-P is transformed to a suitable voltage level and
`21 formed preferably of a pair of axially spaced inner
`later described.
`FIG. 8. As there shown, the AC supply conducted
`applied by the secondary 26-S to the battery charge 34
`cylindrical wall portions 17A concentric with the hull
`The paravane 15 includes a torpedo-like hull or body
`through the leads of the cable 16 to the transformer pri-
`formred of a conventional rectifier/regulator circuit.
`axis and forming the axial bore 17, and an outer wall I 0
`mary 26-P is transformed to a suitable voltage level and
`21 formed preferably of a pair of axially spaced inner
`The battery charger 34 is connected to two battery
`21A which tapers inwardly at the leading and trailing
`applied by the secondary 26-S to the battery charge 34
`cylindrical wall portions 17A concentric with the hull
`packs, indicated generally at 35 and 36, consisting for
`formred of a conventional rectifier/regulator circuit.
`ends to join the inner wall portions 17 A. The hull is
`axis and forming the axial bore 17, and an outer wall
`The battery charger 34 is connected to two battery
`example of seven batteries each with their mid points
`21A which tapers inwardly at the leading and trailing
`preferably built in two halves, indicated generally at
`connected to a common ground. These battery packs
`packs, indicated generally at 35 and 36, consisting for
`ends to join the inner wall portions 17A. The hull is
`22A and 228, joined together along one edge by a
`example of seven batteries each with their mid points
`35 and 36 may be conveniently arranged in the form of
`preferably built in two halves, indicated generally at
`piano hinge 23 and a plurality of conventional latches 1 5
`connected to a common ground. These battery packs
`22A and 22B, joined together along one edge by a
`a center battery and six circumferentially spaced bat-
`24, to facilitate installation of the depth controller on
`35 and 36 may be conveniently arranged in the form of
`piano hinge 23 and a plurality of conventional latches
`teries contacting and located in a cylindrical path about
`the seismic cable or streamer. The hull sections 22A
`a center battery and six circumferentially spaced bat-
`24, to facilitate installation of the depth controller on
`the center battery, producing generally cylindrical,
`and 228, and the bushings 18, may be made of vacuum
`the seismic cable or streamer. The hull sections 22A
`teries contacting and located in a cylindrical path about
`seven battery packs as indicated at 35 and 36 in FIG.
`formed plastic material, or of metal, and are arranged
`the center battery, producing generally cylindrical,
`and 22B, and the bushings 18, may be made of vacuum
`20 7 located within the cylinder 31. The battery packs 35
`seven battery packs as indicated at 35 and 36 in FIG.
`to define an elongated compartment 228' in the hull
`formed plastic material, or of metal, and are arranged
`and 36 provide the power to operate the electronic and
`7 located within the cylinder 31. The battery packs 35
`section 228 and a shorter compartment 22A' in the
`to define an elongated compartment 22B’ in the hull
`servo systems, and provide the advantage that should
`and 36 provide the power to operate the electronic and
`hull section 22A which registers with the forwardmost
`section 22B and a shorter compartment 22A’ in the
`the AC supply signal to the transformer 26 become in-
`servo systems, and provide the advantage that should
`hull section 22A which registers with the forwardmost
`portion of the compartment 228'.
`the AC supply signal to the transformer 26 become in-
`termittant, the depth controller would not be adversely
`portion of the compartment 22B’.
`The special spacer 19 incorporated in the streamer 25
`tennittant, the depth controller would not be adversely
`affected. As an alternative, the circuit may be powered
`The special spacer 19 incorporated in the streamer
`cable, as previously mentioned, includes the primary
`affected. As an alternative, the circuit may be powered
`by using a suitable power supply in place of the batter(cid:173)
`cable, as previously mentioned, includes the primary
`windings and primary core section 26-P of transformer
`by using a suitable power supply in place of the batter-
`ies and charger, consisting of a rectifier/regulator cir(cid:173)
`windings and primary core section 26-P of transformer
`26, the primary winding and primary core section 27-P
`ies and charger, consisting of a rectifier/regulator cir-
`26, the primary winding and primary core section 27-P
`cuit having two outputs.
`of transformer 27, and the secondary winding and sec(cid:173)
`cuit having two outputs.
`of transformer 27, and the secondary winding and sec-
`A pressure transducer 37 is provided in the cylinder
`A pressure transducer 37 is provided in the cylinder
`ondary core section 28-S of transformer 28. The leads
`ondary core section 28-S of transformer 28. The leads
`30 assembly 31 for the purpose of indicating the depth at
`assembly 31 for the purpose of indicating the depth at
`from the transformer primary 26-P extends through the
`from the transformer primary 26-P extends through the
`which the controller is operating at any given instant.
`which the controller is operating at any given instant.
`cable and connect to the AC power source in the tow-
`cable and connect to the AC power source in the tow-
`The pressure transducer 37 in the illustrated embodi(cid:173)
`The pressure transducer 37 in the illustrated embodi-
`ing vessel to provide an AC power supply to the depth
`ing vessel to provide an AC power supply to the depth
`ment is of the potentiometric type having an electrical
`ment is of the potentiometric type having an electrical
`controller circuit, and the leads from the transformer
`controller circuit, and the leads from the transformer
`resistance element 37R and a slider 373 coupled to a
`resistance element 37R and a slider 37S coupled to a
`primary 27-P extend through the cable and connect to
`primary 27-P extend through the cable and connect to 35
`diaphragm 37D exposed thorugh an opening in the wall
`diaphragm 37D exposed thorugh an opening in the wall
`a suitable command signal transmitter or generator in
`a suitable command signal transmitter or generator in
`of the cylinder 31 to the hydrostatic pressure of the
`of the cylinder 31 to the hydrostatic pressure of the
`the towing vessel to provide the command signal input
`the towing vessel to provide the command signal input
`water body in which the controller is operating. Of
`water body in which the controller is operating. Of
`to the depth controller. The leads from the transfonner
`course other types of pressure transducers can be used
`to the depth controller. The leads from the transformer
`course other types of pressure transducers can be used
`secondary 28-S extend through the cable 16 to a con-
`if desired. One side of the electrical resistance element
`secondary 28-S extend through the cable 16 to a con(cid:173)
`if desired. One side of the electrical resistance element
`ventional depth readout device on the towing vessel for
`37R is connected to common ground, while the other
`ventional depth readout device on the towing vessel for 40
`the purpose of monitoring the depth of the controller.
`37R is connected to common ground, while the other
`side is connected to the battery pack 35. Thus a voltage
`the purpose of monitoring the depth of the controller.
`The spaces within the hull 21 other than the compart-
`side is connected to the battery pack 35. Thus a voltage
`output appears on the slider 375 which is proportional
`The spaces within the hull 21 other than the compart(cid:173)
`ments 22A’ and 22B’ are preferably filled with a suit-
`output appears on the slider 37S which is proportional
`to the hydrostatic pressure acting on the diaphragm
`able closed cell foam material, indicated at 21F to
`ments 22A' and 228' are preferably filled with a suit(cid:173)
`37D. The voltage thus obtained on the slider 375 is
`to the hydrostatic pressure acting on the diaphragm
`cause the complete depth controller to have nearly
`able closed cell foam material, indicated at 21F to
`connected to a voltage controlled oscillator 38 of an
`37D. The voltage thus obtained on the slider 37S is
`neutral buoyancy. Sealed gear boxes having a construc-
`cause the complete depth controller to have nearly 45
`ordinary and conventional
`type, whose output fre-
`connected to a voltage controlled oscillator 38 of an
`tion as later described, indicated by the reference char-
`neutral buoyancy. Sealed gear boxes having a construc(cid:173)
`quency is proportional to the voltage on the slider 378.
`ordinary and conventional type, whose output fre-
`acters 29-X1, 29-X2, 29-Y1 and 29-Y2 are mounted
`The output of the voltage controlled oscillator 38 con-
`tion as later described, indicated by the reference char(cid:173)
`quency is proportional to the voltage on the slider 37S.
`on the outer wall 21A of the hull in the compartment
`nects to the primary 28-P of the transformer 28, so that
`acters 29-X1, 29-X2, 29-Y1 and 29-Y2 are mounted
`The output of the voltage controlled oscillator 38 con(cid:173)
`22A’ and the forward portion of the compartment 22B’
`a signal representing the output of the voltage con-
`on the outer wall 21A of the hull in the compartment
`nects to the primary 28-P of the transformer 28, so that
`at positions spaced 90° apart to control diving planes
`trolled oscillator 38 signifying the depth of the control-
`50 a signal representing the output of the voltage con(cid:173)
`22A' and the forward portion of the compartment 228'
`ler is carried from the second 28-S of the transformer
`30-X1, 30-X2, 30-Y 1, and 30-Y2 projecting outwardly
`at positions spaced 90° apart to control diving planes
`trolled oscillator 38 signifying the depth of the control(cid:173)
`from the hull 21 along radial axes perpendicular to the
`28 through the cable 16 to the towing vessel to operate
`30-X1, 30-X2, 30-Y1, and 30-Y2 projecting outwardly
`cable axis. The electronics for the depth controller and
`ler is carried from the second 28-S of the transformer
`the depth readout device and indicate the depth of the
`from the hull 21 along radial axes perpendicular to the
`the servo motors for driving the gear boxes controlling
`28 through the cable 16 to the towing vessel to operate
`controller. This eliminates the need for separate depth
`transducers in the streamer cable, which has been com-
`the diving planes are housed in a sealed cylinder 31 lo-
`cable axis. The electronics for the depth controller and
`the depth readout device and indicate the depth of the
`the servo motors for driving the gear boxes controlling 55
`cated in the compartment 22B’, having curved spring
`monly practiced.
`controller. This eliminates the need for separate depth
`arms 32 which support the sealed cylinder assembly 31
`The depth signifying voltage at the slider 37S is also
`the diving planes are housed in a sealed cylinder 31 lo(cid:173)
`transducers in the streamer cable, which has been com-
`within the compartment 22B’ and, together with the
`applied through an isolating resistor R1 and across re-
`cated in the compartment 228', having curved spring
`monly practiced.
`guide pin 20, insure that the cylinder assembly 31 is in
`sistor R2 to one input of a differential operational am-
`arms 32 which support the sealed cylinder assembly 31
`The depth signifying voltage at the slider 37S is also
`a preselected position in its compartment. The sealed
`plifier 39. A depth command signal coming from the
`within the compartment 228' and, together with the
`applied through an isolating resistor R 1 and across re(cid:173)
`towing vessel is connected to the primary 27-P of the
`cylinder assembly 31 contains the secondary windings
`guide pin 20, insure that the cylinder assembly 31 is in
`and core sections 26-S and 27-S of transformers 26 and
`sistor R2 to one input of a differential operational am(cid:173)
`transfonner 27 whose secondary is connected to the
`a preselected position in its compartment. The sealed
`plifier 39. A depth command signal coming from the
`input of a demodulator 40 which may be of an ordinary
`27 and the primary windings and cor section 28-P of
`cylinder assembly 31 contains the secondary windings
`transformer 28. located so as to mate with their corre-
`towing vessel is connected to the primary 27-P of the
`FM discriminator type if the depth command signal is
`an FM signal. Other types of modulation, and suitable
`and core sections 26-S and 27-S of transformers 26 and
`sponding primary and
`secondary core
`sections
`transformer 27 whose secondary is connected to the
`mounted in the spacer 19 when the cylinder assembly
`demodulators, may be employed if desired, the main
`27 and the primary windings and cor section 28-P of 65
`input of a demodulator 40 which may be of an ordinary
`transformer 28, located so as to mate with their corre(cid:173)
`FM discriminator type if the depth command signal is
`sponding primary and
`secondary core sections
`an FM signal. Other types of modulation, and suitable
`mounted i