Low Bias Low Cost 3-Axis Inertial Optical Fiber Gyro Sensor for Navigation
This product is an inertial angular rate sensor based on the optical Sagnac effect, which is used to measure the angular rate of the carrier along the sensitive axis of the product. An angular rate sensing unit of the product is an optical fiber ring, a digital closed loop detection circuit is adopted to extract the optical path difference of clockwise and counterclockwise propagation light caused by external physical angular rate and sensed by the optical fiber ring, and meanwhile, a voltage signal converted from an optical path difference signal is subjected to closed loop feedback and control, so that the modulation and demodulation of the signal are realized, and the purpose of high-precision angular rate signal detection is achieved.
This product consists of an optical angular velocity sensing unit and a signal detection unit, and provides information of three-axis angular increment and internal temperature.
The products are mainly suitable for high-precision inertial navigation systems, positioning and orientation systems and other applications.
The main components of the product are as follows:
- The optical path unit comprise an erbium fiber light source, an optical fib ring, an integrated optical phase modulator, an optical fiber coupler and a photodetector;
- The circuit unit comprises a light source driving circuit and a detection and control signal circuit board;
- Gyroscope structural parts.
Performance Characteristics
| Serial number | Test item | Unit | Technical requirements |
| 1 | Measuring range | º/s | ±300 |
| 2 | Zero bias stability at room temperature (100s smoothing, 1σ) | º/h | ≤0.01 |
| 3 | Zero-bias repeatability | º/h | ≤0.01 |
| 4 | Random walk coefficient | º/h1/2 | ≤0.001 |
| 5 | Scale factor repeatability | ppm | ≤100 |
| 6 | Operating temperature | ℃ | -40~+60 |
| 7 | Storage temperature | ℃ | -50~+70 |
| 8 | Supply voltage | V | +5V |
| 9 | Bandwidth | Hz | >200 |
| 10 | Steady-state power consumption | W | ≤7 |
| 11 | Start time | min | 1 |
| 12 | Startup instantaneous power consumption | W | ≤ 10 (within 3s after power on)
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Pin definition
| Point number | Definition | Comment |
| 1,9 | +5V | Power supply input |
| 2,10 | GND | Power ground |
| 8 | SEL+ | Gyroscope gating power supply, connected to high level + 5V |
| 15 | SEL- | Gyro gating signal |
| 6 | TXD+ | Gyro differential output positive |
| 14 | TXD+ | Gyro differential output negative |
| 3,4,5,7,11,12,13 | —— | Reserved |
| Gyro gating power is externally connected with + 5V, and the gating signal is TTL level. |
Dimensions
Overall dimension of circuit box (mm): (96 ± 0.1) × (96 ± 0.1) × (32.9 ± 0.1) (L × W × H);
Dimension of optical fiber sensing unit (mm): Ф92 × 27;
Installation dimension of circuit box (mm): (88 ± 0.1) × (84 ± 0.1) (L × W), Φ4mm × 4;
Installation dimension of optical fiber sensing unit:
Such asFig. 2 Schematic diagram of installation of sensing unitAs shown.
30G three axes fiber gyro triaxial gyro 3 axes opt...
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Low Bias Low Cost 3 Axis Inertial Optical Fiber Gyro Sensor For Navigation Images
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