Model F70M-M-C High Accury Single-axis Fiber Optic Gyroscope With
0.25 °/hr Bias Drift
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.
2. Main Performance and Technical Parameters
2.1 Main Performance
| Index name | Index requirements | Remarks |
Range of measured angular rate
(°/s) | ±400 | |
Scale Factor Non-linearity at
fixed temperature
(ppm) | ≤100 | |
Asymmetry of Scaling Factor at
Room Temperature
(ppm) | ≤100 | |
Scale Factor Repeatability at
fixed temperature
(ppm) | ≤0.25 | |
Scale Factor Repeatability at
full temperature range from －40℃ till 60℃ (ppm) | ≤0.25 | |
Bias Drift at fixed temperature
(10s,1σ,°/h) | ≤0.25 | |
Bias Drift Repeatability at
fixed temperature
(1σ,°/h) | ≤0.03 | |
Bias Drift Repeatability at
full temperature range from －40℃till 60℃
(1σ,°/h) | ≤0.05 | Fixed-point constant
temperature test |
Bias Drift at full temperature
range from －40℃ till 60℃
(100s,1σ,°/h) | ≤0.25 | Off line compensation |
Random Wail
(°/√h) | ≤0.003 | |
Warm up time
(min) | ＜5 | |
Random vibration
(°/h) | ≤0.1 | The difference between
the mean of zero
deviation before and
after vibration |
Shock
(°/h) | ≤0.1 | Zero deviation before
and after vibration |
| Resolving power | ≤0.5 | |
Zero deviation change before and after
vibration (°/h) | ＜0.2 | |
Zero bias sensitivity
(°/h/GS) | ＜0.5 | |
| Storage temperature | －50℃~70℃ | |
| Operating temperature | －40℃~60℃ | |
2.2 Power Supply Requirements
Input voltage:±5V；
Power precision:±5%；
Power Ripple:＜50mV；
Gyroscopic power consumption:≤ 6W.
2.3 Insulation Requirements
Measuring the insulation resistance between individual signals and
shells with 100V Megohmeter at 20 C (room temperature) ≥20 MΩ
2.4 Structural Dimensions
Outline size:70mm×70mm×32mm,tolerance:±0.1mm；
Installation dimension:62 mm×62mm,tolerance:±0.1mm；
Flatness of Product Installation Surface:＜0.1mm
2.5 Weight
＜250g
