Model F3X122MI High Accury There-axis Fiber Optic Gyroscope With 0.5 °/hr Bias Drift

1.Product Brief

1.1 Working Principle and Function of Products

This product is a three-axis angular rate inertial sensor, which consists of three single-axis fiber optic gyroscopes with a single light source and electronic circuit.

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.

1.2 Configuration

1.2.1 Components

Optical part: light source (three Fogs use one single light source), fiber coils, coupler, phase modulator, optical-to-

electrical converter

Circuit part: preamplifier, AD convertor, digital signal processor, DA convertor, output interface and light source control

unit.

1.2.2 Outline size: 122 mm×103 mm×71mm

1.2.3 Weight:1050 ± 50g

1.3 Performance

Range of measured angular rate(º/s): ±1201

Bias(º/h): -3 ~ +3

Bias drift(10s,1σ)(º/h): ≤0.5

Bias repeatability(1σ)(º/h): ≤0.5

Bias at changing temp(º/h)(-40~+60°C): ≤5

Bias magnetism sensitivity(º/h/Oe): ≤0.5

Scale factor(sp/º/s): 2200 ~ 2600

Scale factor change at full
temperature(-40~+60°C)

(ppm): ≤5000

Scale factor repeatability(1σ)(ppm): ≤200

Scale factor non-linearity(ppm): ≤200

Scale factor asymmetry (ppm): ≤200

Startup time(min): ≤15

Threshold(º/h): ≤0.5

Dead zone(º/h): ≤1.0

Resolution(º/h): ≤0.5

Bandwidth(Hz): ≥100

Output delay time(ms): ≤2

Maximum start-up angular rate(º/s): ±120

Random Walk Coefficient(º/h^1/2): ≤0.05

1.4 Mechanical and electrical connections

1.4.1 Mechanical interface

Four M5 screw holes on the bottom, and two of them are positioning holes

1.4.2 Power consumptionthem are positioning holes

When the product works steadily, the power consumption is less than 7.5W.

1.4.3 Electrical interface

The product uses J30-21TJ 21-core socket to supply power and output data.

Fig 1. Definition for Model J30-21TJ connector