Model XB185D 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 overall installation size
and installation method
1.3 Overall dimensions
Single gyroscope configuration: 98mm×98mm×34mm
1.3.1 Iinstallation method
The gyro is fixed with 4 M5 screws and metal support.
1.4 Weight
| Weight | Note |
| 480g±20g | The weight of the product includes the cables,
connectors and other accessories attached to the
gyroscope |
1.5 Technical parameters
| Parameter name | Ⅰ | Ⅱ | NOTE |
Scale factor asymmetry
(ppm) | ≤50 | ≤50 | |
| Scale factor nonlinearity(ppm) | ≤50 | ≤50 | |
Scale factor Repeatability at full
temperature range from ﹣40℃ till 60℃
(ppm,1σ) | ≤50 | ≤50 | |
Temperature scale factor polar deviation
(ppm) | ≤100 | ≤200 | After the compensation |
Absolute value of zero deviation
(°/h) | ≤10 | ≤10 | Deduction to speed |
Bias Drift at fixed temperature
(°/h,10s,1σ) | ≤0.05 | ≤0.05 | Constant temperature at a fixed point in the total
temperature range |
| Zero bias repeatability(°/h,1σ) | ≤0.05 | ≤0.05 | Constant temperature at a fixed point in the total
temperature range |
Zero bias temperature sensitivity
(°/h/℃) | ≤0.01 | ≤0.01 | The total temperature range |
Zero bias sensitivity
(°/h/Gs) | ≤0.02 | ≤0.02 | |
Warm up time
(min) | ≤1 | ≤3 | The time from power on to the gyro output
performance meeting the target requirements |
Range of measured angular rate
(°/s) | ≥±400 | ≥±260 | |
The threshoid value
(°/h) | ≤0.05 | ≤0.05 | |
Resolution
(°/h) | ≤0.05 | ≤0.05 | |
Random Walk
(°/h½) | ≤0.01 | ≤0.01 | |
Input shaft misalignment Angle
(') | ≤60 | ≤60 | |
Misalignment Angle is not repeatable
(",1σ) | ≤20 | ≤20 | Constant temperature test |
Bandwidth
(Hz) | ≥200 | ≥200 | |
Output delay time
(μs) | ≤500 | ≤500 | |
The random vibration is zero deviation
(°/h) | ≤0.1 | ≤0.1 | |
Zero deciation before and after impact
(°/h) | ≤0.1 | ≤0.1 | |
Parameter stabilization time
(month) | ≥18 | ≥18 | |
1.6 Mechanical and electrical interfaces
1.6.1 Mechanical interface
Product shell bottom as the cutting Angle square, cutting Angle of
the square corners of uniform four Φ 5.2 installation
hole, hole spacing (80 ± 0.1 mm) x (80 ± 0.1 mm); The bottom
surface of the shell is the mounting plane of the gyro, the
flatness is 0.01.
1.6.2 Electrical interface
XB185D gyro signal output connector adopts J30-21TJ socket of
guihang electric appliance (corresponding acquisition
line is J30-21ZK). Socket pin signal definition:
| Pin number | Signal name | Physical meaning |
| 1,12 | The main board ＋5V | Gyro motherboaed power supply |
| 13,14 | The main board ±5V(Ground wire) |
| 4,15 | The main board －5V |
| 6,16 | The light source ＋5V(Ground wire) | Gyro power supply |
| 7,17 | The light source ＋5V |
| 2 | (Reserved external synchronization
signal) | TTL level(reserved) |
| 3,5 | NC | Standby |
| 8,18 | T＋ | RS422 hair |
| 9,19 | T－ |
| 10,20 | R＋ | RS422 receiver(differential synchronous
signal) |
| 11,21 | R－ |
