Model F70L-M High Accury Single-axis Fiber Optic Gyroscope With
0.05 °/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 Shape and Installation Dimensions
The bottom of the shell is a tangential square with a shape size
70mm × 70mm ×32mm. Four 4.2 mounting holes are distributed at the
four corners of the tangential square with a pitch of (62 ±0.1 mm)
× 62 ±0.1 mm. The bottom of the shell is a gyro mounting plane with
a flatness less than 0.01.
1.4 Weight
≤300g
1.5 Performance parameter
| Index name | Index requirements | Remarks |
Range of measured angular rate
(°/s) | ±300 | |
Scale Factor Non-linearity at
fixed temperature
(ppm) | ≤50 | |
Asymmetry of Scaling Factor at Room Temperature
(ppm) | ≤50 | |
Scale Factor Repeatability at
fixed temperature
(ppm) | ≤50 | |
Scale Factor Repeatability at
full temperature range from －40℃till 60℃ (ppm) | ≤150 | |
Bias Drift at fixed temperature
(10s,1σ,°/h) | ≤0.05 | |
Bias Drift Repeatability at
fixed temperature
(1σ,°/h) | ≤0.5 | |
Bias Drift Repeatability at full
temperature range from －40℃ till 60℃
(1σ,°/h) | ≤0.5 | Fixed-point constant
temperature test |
Bias Drift at full temperature range from
－40℃ till 60℃
(100s,1σ,°/h) | ≤1 | Off line compensation |
| Random Walk(°/√h) | ≤0.008 | |
Warm up time
(min) | 0 | |
| Random vibration(°/h) | 5g | |
| Shock(°/h) | ≤0.1 | Zero deviation before and after impact |
| Resolving power | ≤0.5 | |
Zero deviation change before and after vibration
(°/h) | ≤0.5 | |
| Zero bias sensitivity(°/h/GS) | ＜0.5 | |
| Storage tmperature | －55℃~70℃ | |
| Operating temperature | －40℃~65℃ | |
1.6 Mechanical and Electrical Interface
1.6.1 Mechanical Interface
The product installation surface is a fixed surface for external
installation,and the installation screw is M4.
1.6.2 Power Supply Requirements
| ＋5V | －5V |
| Voltage | 4.75V-5.25V | －4.75V-5.25V |
| Ripple | 20mV | 20mV |
| Current | 1.5A | 0.6A |
1.6.3 Electrical Interface
F70L-M uses J30-21ZK socket of Guihang Electric Appliance to
connect with the outside(J30-21TJ is used for the corresponding
acquisition line)
| Pin number | Signal name | Explain |
| 8,10 | main board ＋5V | Gyroscope
power supply |
| 6,7 | main board ±5v land |
| 13,14 | main board －5V |
| 16 | T＋ | RS422 HAIR |
| 19 | T－ |
| 17 | R＋ | RS422 collection |
| 18 | R－ |
