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Four-frequency laser gyro control method

A technology of four-frequency laser gyro and control mirror, which is applied in the direction of Sagnac effect gyroscope, etc., can solve the problems of high magnetic sensitivity, zero bias and zero bias stability, mode hopping, etc., and achieve small magnetic sensitivity and improved Good accuracy and repeatability

Inactive Publication Date: 2011-08-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The early four-frequency laser gyro used the difference in light intensity to control the length of the path to achieve the control of the dispersion effect. Its disadvantages are: 1. It needs two photoelectric detection and amplification circuits. Any asymmetry in the conversion coefficient or bias of the two signals will affect the zero bias. , resulting in zero bias and zero bias stability related to the circuit; second, not specifically selecting the best operating point, resulting in greater magnetic sensitivity; third, not specifically selecting the order of the longitudinal mode, resulting in poor start-up repeatability, at operating temperature Mode hopping may also occur when the range is large

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  • Four-frequency laser gyro control method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] exist figure 1 Among them, the four-frequency laser gyroscope has four oscillation modes located within the optical bandwidth of gain 49, and their frequencies are expressed as f 1 , f 2 , f 3 , f 4 , where modes 1 and 2 constitute a left-handed top, modes 3 and 4 constitute a right-handed top, modes 1 and 4 operate in a clockwise (CW) direction, and modes 2 and 3 operate in an anticlockwise (AW) direction.

[0023] The zero bias of the four-frequency laser gyro can be expressed as

[0024] bias(q, T, B, f d ) = bias 0 (q,T)+k(q,T)(B-B 0 )(f d -f d0 )(1)

[0025] In the formula, q is the order of the longitudinal mode, T is the absolute temperature, B is the magnetic field strength, f d is the working point, B 0 is the best magnetic field, f d0 is the best working point, bias is the total zero bias, bias 0 It is the zero offset whic...

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Abstract

The invention discloses a four-frequency laser gyro control system. The system realizes the control over a path length and a magnetic field according to variation characteristics of difference frequency information output by a four-frequency laser gyro per se along with the path length and the magnetic field to ensure that the four-frequency laser gyro works under a condition that a zero offset of the four-frequency laser gyro has minimum sensitivity to the variation of the magnetic field or a cavity length, and thus, the performance of the four-frequency gyro is improved.

Description

technical field [0001] The invention relates to the control of the four-frequency laser gyroscope, in particular to the automatic digital control for reducing the sensitivity to the change of the magnetic field or the cavity length of the four-frequency laser gyroscope. Background technique [0002] The laser gyroscope has the advantages of large dynamic range, no acceleration effect, simple structure, and small size. It is an ideal component for inertial systems, especially strapdown inertial systems, and has been widely used in military and civilian fields. The principle of the laser gyroscope is the Sagnac effect, and at least one pair of counterpropagating light waves run in its optical resonant cavity. When it rotates around the sensitive axis relative to the inertial space, the frequency of the opposite traveling waves splits to form a beat frequency proportional to the rotation rate, so the rotation information of the laser gyroscope relative to the inertial space can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/66
Inventor 龙兴武王飞汪之国
Owner NAT UNIV OF DEFENSE TECH
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