Clayson, C. H.

Southampton (e-Prints Soton)

1F7L6 ^ Institute of 0 Oceanographic Sciences Deacon Laboratory INTERNAL DOCUMENT No. 351 Sonic Buoy - Buoy Heading Sensor handbook C H Clayson 1995 Natural Environment Research Council INSTITUTE OF OCEANOGRiLPHIC SCIENCES DEACON LABORATORY INTERNAL DOCUMENT No. 351 Sonic Buoy - Buoy Heading Sensor handbook C H Clayson 1995 Wormley Godalrning Surrey GU8SUB UK Tel +44-(0)428 684141 Telex 858833 OCEANS G Telefax +44-(0)428 683066 D O C U M E N T D A T A SHEET CLAYSON, C H DATE 1995 "ZTTLE Sonic Buoy - Buoy Heading Sensor handbook. Institute of Oceanographic Sciences Deacon Laboratory, Internal Document, No. 351, 19pp, (Unpublished manuscript) The Buoy Heading Sensor was designed to provide a continuous measure of the orientation of the Sonic Buoy; this was required for referring the sonic and provane anemometer data to magnetic North. This document describes in detail the design of the Buoy Heading Sensor; it is intended to serve the combined purposes of documenting the design and acting as a guide to operating and testing the sensor. Institute of Oceanographic Sciences Deacon Laboratory Wormley, Godalming Sur rey GU8 SUB. UK. Telephone Wormley (0428) 684141 TeVer 858833 OCEANS G. Director: Colin Summerhayes DSc Facsimile (0428) 683066 Copies of this report are available from: The Library, PRICE Index -5-1. Introducdom g 2. Functional Description 7 3. Hardware 7 3.1 General 7 3.2 Circuit Descriptions 8 3.2.1 COMPl Board 8 3.2.2 COMP2 Board 8 3.2.3 COMP3 Board 8 4. Wiring 9 5. Operational 10 6. SpeciSeation 11 6.1 Supplies 11 6.2 Power Consumption 11 6.3 Analogue Output 11 6.4 Digital Output 11 7. Acknowledgements 11 Appendix A Hardware 12 A1 Parts Lists 12 A. 2 Assembly Details 14 A3 Circuit Diagram COMPl 15 A4 Circuit Diagram COMP2 16 AS Circuit Diagram COMP3 17 A6 Printed Circuit Boards COMPl and COMP2 18 A. 7 Printed Circuit Board C0MP3 19 -7-SONIC BUOY COMPASS 1. Introdoetlon The compass unit is required to give a buoy heading reference for the ultrasonic and mechanical anemometers. The ultrasonic anemometer requires an analogue signal for input to its analogue input #1; the Multimet meteorological logging system, used to log the Young AQ anemometer, requires a digital heading reference input so that the standard software can be used, to give correct averaging of the wind direction. 2. FumcUenml Demai^tlon The unit incorporates a Digicourse Model 225 digital 8 bit magnetic compass, with gray code output. This device has internal gimbaUing and the housing is, therefore, "strapped-down" to the buoy huU. The electronics added by lOSDL performs the following functions: a) strobes the compass LED source at intervals of, nominally, 1 second, sampling the heading at this rate b) latches the (buffered) photo transistor outputs (gray code) c) opto-isolates the latched gray code for use by the Multimet system d) decodes the latched gray code to binary code and e) converts the binary code (range 0 to 255) to an equivalent analogue output signal in the range +2.048Vto +4.088V, for connection to the Sonic anemometer analogue input #1. These Amotions are implemented by 3 circuit cards, connected by flexible strip wiring. 3. Hardware 3.1 General The compass is mounted in a 100 mm diameter tube with end cap containing 3 Lemo connectors. The compass system is powered by a + 12V supply, with the exception of the opto-isolator ou^uts, which are powered by the Multimet +5V supply 3.2 Circuit Descriptions 3.2.1 COMPl Board This board includes the LED drive circuit, the photo transistor buffers and latches. The sampling frequency (1 Hz) TRIGGER signal, from board COMP3, triggers a D-type flip-flop (part of IC2) which is connected to produce a 4.2 mS output pulse. This pulse drives the LED via the FET TRl with a nominal current of 25 mA. The other half of IC2 is used to generate a 3.8 mS pulse, whose complement is differentiated and inverted to give an ~ lOuS clock for the latches IC4 and ICS, occurring 0.4 mS before the end of the LED drive pulse. The inverted LED drive pulse is differentiated and inverted to give an ~ lOuS WW signal (normally high). This is used to load the digital to analogue converter o n GOMP3 about 0.4 mS after the data have been latched into IC4 and 5. A 220 |Jp capacitor, C8, trickle charged via R6, is used to supply the LED current pulse, smoothing the average consumption of the system. The charge taken from C8 during the LED pulse amounts to 105 jicoulombs, resulting in a droop of about 0.5V Part of ICl and all of ICS (Schmitt trigger input inverting buffers) are used to buffer the photo transistor outputs. The buffered 8 bit gray code is then latched into IC4 and ICS as described above. 3.2.2 COMP2 Board This board includes an 8 bit Gray code to binary converter and opto-isolators for the 8 bit parallel binary output used by Multitmet. The circuit is straightforward, using exclusive-OR gates to perform the gray to binary decoding. The opto-isolator inputs are driven at approximately 2 mA and have a Schmitt trigger output circuit supplied by the Multimet +5V SLpply (PLUSb and GRNDb). 3.2.3 COMP3 Board This board includes an RC oscillator/divider, IC16, with selectable output frequency in the range 1 to 128 Hz (1 Hz is used in this application) and a digital to analogue converter circuit. The latter uses a 12 bit AD754S converter, together with a REF-02 voltage reference and two 308 operational amplifiers for current to voltage conversion and level shifting. The D-A analogue ground is held at the +5V reference, whilst the D-A Vref is connected to OV. The non-inverting input to IG19 is held at the +5V reference voltage, so that its output ranges from +5V to +9.98V over the full digital range of 0 to 4080 (16*255 since the 8 bit input is applied to the 8 most significant bits). IC20 is configured to give an output range of +2.048V to +4.088V over the full digital range of 0 to 4080. -9-4. Wiring The wiring is simple, the boards being daisy-chained together using flexible jumper cable. Connections are made to the housing bulkhead connectors and to the compass DEj plug PLl from Molex connectors SK6 and SK8 on the boards. Junker Arom PCB COMPl, PL3 to PCB COMP2, PL4 Pin Function 1 +12V 2 OV 3 WR/ 4 GRAYS 5 GRAY? 6 GRAY6 7 GRAYS 8 GRAY4 9 GRAY3 10 GRAY2 11 GRAYl 12 TRIGGER 13-15 N/G CB COMP2, PLS to PCB COMP3, PL7 Pin Function 1 + 12V 2 OV 3 WR/ 4 BINS 5 BIN? 6 BIN6 7 BINS 8 BIN4 9 BIN3 10 BIN2 11 BINl 12 TRIGGER 13-15 N/C m COMPl, SK2 to Compass, PLl SKZPin PLlPm Function 1 1 OV 2 2 BITS 3 3 N/C 4 4 LED 5 5 BITS 6 6 Brr4 7 7 N/C 8 8 BIT? 9 9 +12V 10 10 BIT2 11 11 BITG 12 12 BITl 13 13 BFTS 14 14 ANODE - 1 0 -Note that, although the wiring is pin for pin, the nature of EDC DEL connectors requires interleaving of the ribbon cable connection wires 1-7 and 8-14, i.e. the order of the wires entering the Dtti connector clamp is 14, 1, 13, 2, 12, 3, 11, 4, 10, 5, 9, 6, 8, 7. Lemo 3 Lemo 2 Lemo 1 Figure 1. l id Connectors, showing North index mark Connections from COMP2, SK6 to Lemo 3 SKGPin Lemo 3 Pin Function 1 10 PLUSb (opto-isolator +ve supply I/P) 2 9 GRNDb (opto-isolator ground) 3 8 Isolated GRAYS 4 7 Isolated GRAY? 5 6 Isolated GRAYS 6 5 Isolated GRAYS 7 4 Isolated GRAY4 8 3 Isolated GRAY3 9 2 Isolated GRAY2 10 1 Isolated GRAYl Connections from COMP3, SK8 to Lemos 1 and 2 SKSPin Lemo 1 Pin Lemo 2 Pin Function 1 2 + 12V 2 1 OV 3 2 AN-O/P 4 1 OV 5. Operatloxwl The unit requires no special attention, other than in ensuring its correct alignment relative to the buoy. - 1 1 -6. Specification 6.1 Supplies The compass uses a single + 12V supply, with a consumption of approximately 4.5 mA, 6.2 Power Consumption The power consumption is approximately 54 mW. 6.3 Analogue Oulput The analogue output ranges from +2.048V to +4.088V as the compass is rotated 358.6° clockwise (looking down on its top) from an initial orientation with its N index mark pointing to magnetic North. 6.4 Digital Output The digital output is an 8 bit gray code which, when decoded to binary, ranges from 0 to 255 as the compass is rotated as above. 7. Ackno«l*dgeznemtB The development of this equipment was part funded by DRA Portland. The writer also wishes to acknowledge the important contributions made by the OTDD Met Team, Design Office, Production Office and Workshop towards its development. j^pendix A Haidwar* - 1 2 -A. 1 Parts Lists Mechanical Details 1 ogIOS/CSS97 Detail 83 1 ogIOS/CSS97 Detail 84 1 ogIOS/CSS97 Detan 85 4 off IOS/C5597 Detail 87 8 ogIOS/CSS97 Detail 88 Compass Housing Body Compass Housing Cap Compass Housing Base Compass Bolt Compass Spacer Assorted Fasteners 8 off 12 mm x M4 hex grub screws 4 off 15 mm x M4 C/H Screws Lemo Connectors logERA3E303CNL 1 offERA3E302CNL 1 offERA3E310CNL Lemo 1 Lemo 2 Lemo 3 Bulkhead Series 3, 3 way connector Bulkhead Series 3, 2 way connector Bulkhead Series 3, 10 way connector (part numbers given below are for supplier FEC = FameU Electronic Components Ltd.) COMPl PCB loffPCB PC Board to artwork COMPIART G&B Electronic Designs Ltd. lofflSLINK PL3 Flexstrip Jumper, 15 way, 101.6 mm FEC 151-961 1 offCCEA#220MF C8 Capacitor Electrolytic, 16V FEC 106-004 2offCD40106 ICl, IC3 CMOS Schmitt I/P Invertor FEC CD40106BCN loffCD4013 IC2 CMOS Dual D-Flip Flop FEC CD4013BCN 2oaCD4042 IC4, IC5 CMOSOuadD-Latch FEC CD4042BCN 2 off CFKC2#100PF C6, C7 Capacitor FKC2 loffCFKC2#SOT C2 Capacitor MKS2, nom ISn, 63V FEC 143-675 1 offCFKC2#SOT C4 Capacitor Ceramic X7R,nom33n, lOOV FEC 108-948 1 offCMKS2#SOT C3 Capacitor Ceramic X7R,nom33n, lOOV FEC 108-948 2offCMKS2#SOT C5 Capacitor Ceramic X7R, nom 22n, lOOV FEC 108-947 1 offCrANT#10pF CI Capacitor Tantalum, lOn, 16V FEC .227-766 1 offiDcie PL2 IDC Transition Connector 14 Way FEC 469-221 Associated Parts 14way ribbon cable 14 way DIL Plug FEC 297-318 FEC 145-061 1 offPATCH PATCH/1 Wire link 4offRMFW25#100K Rl, R2, R3, R4 Resistor 100k Metal FSm FECMFR4 lOOK 1 offRMFW25#270R RS Resistor 100k Metal pom FECMFR4 270R 1 offRMFW2S#4K7 R6 Resistor 100k Metal Film FECMFR4 4K7 1 offVNlOKM TRl MOSFET FECVNIOKM -13-COMP2PCB 1 ogPCB 1 og ISLINK 2ogCD4030 BoEHl ILIB 1 ofEMOLEXlO Associated Part 1 ogRP8C#4K7 COMP3PCB logPCB 1 ogAD7545 1 ogCD4060 2oaGFKC2#lN5F 3oECFKC2#33PF 1 ogCTANT#10MF 1 oEDIPSWaNO 2 ogIM308N 1 ogMOIZX4 Associated Parts 1 ogREF-02GP 4ogRMFW2S#10K 2 ogRMFW2S#SK0 1 ofFRMFW25#68R 1 ogRPOTVTM#10K PLS ICG, IC7 ICIO, IC11,IC12, IC13, IC14, ICIS, IC8, IC9 PL6 R7A-H IC17 IC16 C12, C13 C10,C11,C9 C14 SWl-8 IC19, IC20 PL8 IC18 R11,R13, R14,R9 RIO, R12 R8 RVl Printed Circuit Board to artwork COMP2JWr Hexstrip Jumper Cable, IS way, 101.6 mm CMOS Ouad 21/P Exclusive-OR Molex Connector, 90°,10 way Crimp Connector 10 way Crimp terminals SEi Resistor Array, Bourns 4609X-101 4K7 Printed Circuit Board to artwork COMP3 JWT D-A Converter CMOS Oscillator/Divider Capacitor EKC2 InS Capacitor Ceramic NPO Capacitor Tantalum, lOn. 16V DIL Switch 8 single Throw Operational Amplifier Molex Connector, 90°, 4 way Crimp Connector 4 way Crimp terminals Voltage Reference 5V Resistor 100k Metal m n Resistor 100k Metal Rim Resistor 100k Metal Rhn Multi Turn Cermet Trimmer G&B Electronic Designs Ltd. FEC lSl-961 FEC FEC 146-697 FEC 143-131 FEC 143-116 FEC 148-803 G&B Electronic Designs Ltd. FECAD7S45KN FEC CD4060BCN FEC 147-666 FEC 498-SS5 FEC .227-766 FEC 422-666 FECLM308AN FEC 146-693 FEC 143-128 FEC 143-116 FEC J%EP02CP FECIVIFR410K FECMFR4 5K0 FECMFR4 68R FEC 237-S16 A, 2 Assembly Details -14-END CAP WITH LEMOs m m COMPl COMPZ C0MP3 Compass Bolt Figures. General Assembly Schematic The compass unit and PCBs are mounted on the lower end cap, using spacers. Sufficient cable length is allowed between the SK6 and SK8 connectors and the Lemo connectors in the upper end cap to allow the lower end cap assembly to be withdrawn from the housing. CDif0106 COW 106 TRIGGER f-O " ' r CLK 3 RES Q\ IC2 COW 106 SET D CLK RES ro Q 8 a\ IC2 »ijS< X IBBK -C=H R2 r CDWIBG ICl BITB-BIT7-SIT6-ORIVE -C3-VN10KM HS BITB • LED • BIT5-]TR BIT3 • BITk • BIT7 - B I T l -UO BITZ BITB B I T ! • BITS • B IT3-pg % J ANODE Nam W«SP8» L> PL2 BIT2-B I T l -CDWiBG IC l COW 106 IC l CDW10G U 4401130 I— - ^ » J IC3 CD4010G I t 3 COkOlBG IC3 CDW9106 IC3 COk010P IC3 CD4010G WR/ IC3 01 D2 03 Dk. POL CLK ai an g 02 g H2\ 8 113 Q3\ Qif aif\ GRAYB GRAY? GRAYB GRAYS ICk +12V Ql Dt ni\ 02 g 02 03 3 82 \ OkK 8 03 POL U3\ CLK Ok Ok\ GRAYV GRAYS GRAYZ GRAYl ICS PL3 SHEET 1 OF 3 ISSUE REV. I DATE lB-BB-91 CJ I 8 INSTITUTE OF OCEANOGRAPHIC SCIENCES. DEACON LABORATORY.BROOK RQAD.WQRMLEY. GODALMING.SURREY.GU8 SUB.ENGLAND. FILENAME COMPl.DGM SONIC BUOY - DIGICOURSE COMPASS INTERFACE (BD 1) icu I 8 INSTITUTE OF OCEANOGRAPHIC SCIENCES. DEACON LABORATORY. BROOK ROAD. kCRMLEY. GODALMING. SURREY CUB SUB. ENGLAND FILENAME SONIC BUOY - DIGICOURSE COMPASS INTERFACE (BD. 2) SHEET ISSUE DATE tn +iev WR/ TRIGGER PL 7 MR FS DB RTC 013 O B U M / DBI0 C S / DBS DBB V r a f DB7 i n DBS ^ Rfb DBS DBM. Q OUT < Agnd DB3 0 8 2 DBl DB0 I C 1 7 +12V 0V AN-O/P IC20 N/C N/C V I n 9 N/C TEMP U_ Vout ^ GND W T R I M -D •s 8 CO I C I B swi-a INSTITUTE OF OCEANOGRAPHIC SCIENCES. DEACON LABORATORY.BROOK ROAD.WORMLEY. GODALMING.SURREY,GUB SUB .ENGLAND -FILENAME CDMP3.DGM SONIC BUOY - DIGICOURSE COMPASS INTERFACE (BD. 3 SHEET ISSUE DATE 2 OF 3 REV. 1 1 B - 0 E - 3 1 cr> a PLV g|@ # # # # # # # # # # # # # # 1 R7A-H > i # # # # # # # # # 1 IC12 ' IC13 ICG IC15 IC17 lPl9 IC7 ICIG IC18 MMET GRAY C0MP2.AUT %EV1. 2 2 - 5 - 9 1 PL5 |# # # # # # # * # # # * # # # ! % # * r # ici^ COMPl.AUT REV.l 2 3 - 5 - 9 1 ^ k — 5 # # #' # 1 % g — 5 <_) 0 # 1 W—5 # # # * * # # # CM fZ e # # # # # ro CM U ( J to 0 1 8 a 8 IC17 # # # * # # # IC19 C13 C12 E 3 w m cn no -F # # # # # # # # # # # # # # # ed/IOO P-[Goa pa)i:pd z v - 6 1 -Brook Road, Wormley, Godalming Surrey, GU8 SUB, United Kingdom Telephone + 44 (0) 428-684141 Facsimile + 44 (0) 428-683066 Telex 858833 OCEANS G j Natural Environment Research Council 

Sonic buoy - buoy heading sensor handbook

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