Application

What Performance is the FOG sensor in FOG North Finder

FOG North Seeker Applied in Coal Mining

1.Application Products

ER-FNS-03 Low Cost 3 Axis FOG North Seeker

2.1 Triaxial Fiber Optic Gyro

2.1.1 Performance Indicators

Table 1 Performance requirements of fiber optic gyroscope

NoIndicatorValue
1Operating temperature (℃)-45~+75
2Start time τ (s)≤5
3Dynamic range (° / s)≥±400
4Zero-bias stability (1σ,/h) (100s Standard Deviation)≤0.3
5Zero bias repeatability (1σ,/h)≤0.3
6Random walk coefficient (°/ √h)≤0.03
7Non-linearity of scale factor (ppm)≤100
8Asymmetry of the scale factor (ppm)≤100
9Repeatability of scale factor (ppm)≤100
10Extreme temperature scale factor (ppm)≤200
11Bandwidth (Hz)≥200

2.1.2 Interface Protocol

Table 2 FOG interface communication protocol

 Data frameOutput DataEditionFirst edition
 Frame description 
ContentTypesAsynchronous serial data frame
 sourceFiber Optic Gyro
 Standards compliantRS-422; baud rate 614400bits / s; 1bit start bit, 8bit data bit without parity, 1bit stop bit
 Update rate400Hz
ElementSignal nameSignal description
1

Head of

Gyro data

0xEB
2 0x90
3Gyro Data4-byte 32-bit signed integer, character 3 is the lowest 8 bits, and character 6 is the highest 8 bits. Negative data are in two’s complement form. The scale factor is: 1
4Gyro Data

4-byte 32-bit signed integer, character 3 is the lowest 8 bits, and character 6 is the highest 8 bits. Negative data are in two’s complement form. The scale factor is: 1

5Gyro Data

4-byte 32-bit signed integer, character 3 is the lowest 8 bits, and character 6 is the highest 8 bits. Negative data are in two’s complement form. The scale factor is: 1

6Gyro Data

4-byte 32-bit signed integer, character 3 is the lowest 8 bits, and character 6 is the highest 8 bits. Negative data are in two’s complement form. The scale factor is: 1

7ReservationFill in 00;
8ReservationFill in 00;
9ReservationFill in 00;
10ReservationFill in 00;
11ReservationFill in 00;
12ReservationFill in 00;
13ReservationFill in 00;
14ReservationFill in 00;
15Temp/conditionTemperature calculation formula: output according to standard 18B20, the negative number of data is in two’s complement form. The scale factor is: 1/16 (the output code value is multiplied by the scale factor to obtain the temperature in Celsius)
16 Status: 0 ~ 3, update period: 1ms
1715,16 data descriptionState 0: gyro temperature; 1: reserved; 2: reserved; 3: working state
18Cycle countThe value of each packet of data is increased by 1, and after 255, the next packet of data is 0;;
19ChecksumAfter accumulating characters from 3 to 18, take the lower 8 bits as the checksum

2.1.3 Power Supply

Power supply type: + 5V -5V GND

Power quality: ± 5%, ripple 20mv

Power (3 way):

Transient: + 5V: 5.0W; -5V: 2.0W

Steady state: + 5V: 3.0W; -5V: 1.5W

More Technical Questions

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