Model F3X50B High Accury There-axis Fiber Optic Gyroscope With 0.5
°/hr Bias Drift
1. Product Introduction
1.1 Working Principle and Function
This product is an inertial angular rate sensor based on the
principle of Sagnac effect, which is used to measure the angular
rate movement of the carrier around the sensitive axis of this
sensor. This unit takes the fiber optic coil as the angular rate
sensitive unit and the closed-loop detection circuit as the basis.
Two beams from a laser are injected into the same fibre but in
opposite directions. Due to the Sagnac effect, the beam travelling
against the rotation experiences a slightly shorter path delay than
the other beam. The resulting differential phase shift is measured
through interferometry, thus translating one component of the
angular velocity into a shift of the interference pattern which is
measured photometrically.
Beam splitting optics launches light from a laser diode into two
waves propagating in the clockwise and anticlockwise directions
through a coil consisting of many turns of optical fibre. The
strength of the Sagnac effect is dependent on the effective area of
the closed optical path: this is not simply the geometric area of
the loop but is enhanced by the number of turns in the coil.
This product is an inertial sensor composed of optical system,
corresponding power supply and data processing circuit. It can
provide three-axis angle increment information.
1.2 Configuration
The product is mainly composed of the following components:
a) Optical part: light source, coupler, Y modulator, fiber coil,
detector;
b) Circuit part: processor board, light source board and
preamplifier;
c) Structural part: body, cover, etc.
1.3 Size
Outward dimension: Φ(79.5 ± 0.1) mm × (79.5 ± 0.1) mm × (49.8 ±
0.1) mm,
Mounting size: (73.0 ± 0.1) mm ×( 73.0 ± 0.1) mm,
1.4 Weight
500g ± 30g
1.5 Performance
| Item | | Remarks |
range
(°/s) | ±500 | |
Scale factor Non-linearity at
fixed temperature
(ppm) | ≤50 | |
Scale factor repeatability at
fixed temp
(ppm) | ≤100 | |
| Start-up time(s) | ≤2 | |
| Standby time(s) | ≤30 | |
Bias drift at fixed temp
(10s,1σ,°/h) | ≤0.5 | |
Bias drift repeatability
(1σ,°/h) | ≤0.5 | |
Bias drift at full temp
(10s,1σ,°/h) | ≤1 | |
| Random walk(°/√h) | ≤0.1 | |
Misalignment angle of input
shaft(＇) | ≤20 | Full temperature range |
| Threshold(°/h) | ≤0.5 | |
| Resolution | ≤0.5 | |
Bias magnetic sensitivity
(°/h/GS) | ＜0.5 | |
| Bandwidth(HZ) | ≥200 | Design assurance |
| Output delay time(μs) | ≤1000 | |
Average values of bias before,
duing and after vibration
(°/h) | ≤1 | |
Bias after vibration difference
from vibration before(°/h) | ≤0.3 | |
1.6 Mechanical and electrical interfaces
1.6.1 Mechanical interface
Four M3 Screws of the mounting side.
1.6.2 Power Supply and Power Consumption
| Voltage | Voltage range | Ripple(RMS) | Current |
| +5V | ±5% | ≤50mV | ＞3.00A(start-up) |
| ＞1.00A(working) |
Power consumption: working status ＜5W at room temperature, ＜8W at
full temp
Start-up status: ≤ 10W
1.6.3 Electrical Connection Interface
FIG 3 Definition of connector (Model J30J-25ZKP3)
| Serial number | Signal | Contact number | Remarks |
| 1 | +5V | 1,2 | Gyroscope power supply |
| 2 | GND | 3,15 |
| 3 | TX+ | 10,22 | RS422TX |
| 4 | TX- | 11,23 |
| 5 | TR+ | 12,24 | RS422 RX |
| 6 | TR- | 13,25 |
