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The main technical principles that laser gyros need to break through are drift, noise, and blocking thresholds.

Aug 10, 2018


Drift

The drift of the laser gyro shows the instability of the zero offset. The main sources of error are: the refractive index of the resonant optical path has anisotropy, the flow of helium plasma in the laser tube, and the anisotropy of the diffusion of the medium.

 

Noise

The noise of the laser gyro is expressed in the angular velocity measurement. The noise mainly comes from two aspects: one is the spontaneous emission of the laser medium, which is the quantum limit of the noise of the laser gyro. Second, mechanical jitter is the bias frequency technique adopted by most laser gyros. When the jitter motion changes direction, the jitter angular rate is low. In a short time, below the blocking threshold, the input signal will be lost and the output signal phase will be caused. Random variations of the angle.

 

Blocking threshold

The blocking threshold will affect the linearity and stability of the laser gyro scale factor. The blocking threshold depends on the loss in the resonant optical path, mainly the loss of the mirror. The laser gyro is a new navigation instrument developed on the basis of optical interference principle. It becomes the ideal main component of the new generation of strapdown inertial navigation system. The envisaged object is precisely positioned. The quartz flexible pendulum accelerometer is a sensitive component made of fused silica. The flexible pendulum structure is equipped with a feedback amplifier and a temperature sensor for measuring the linear acceleration along one axis of the carrier.

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