System and method for detecting lock-in threshold of double-longitudinal-mode laser gyroscope under tunable frequency

A technology of laser gyroscope and threshold value detection, which is applied to Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, measuring devices, etc., can solve problems such as gyroscope out-of-lock area and gyroscope lockout threshold reading error, and avoid The effect of misjudgment

Active Publication Date: 2018-07-20
XIAN UNIV OF TECH
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Problems solved by technology

[0003] At present, the detection method of laser gyroscope locking threshold is generally aimed at single longitudinal mode laser gyroscope. This judgment method has the problem of pulse number fluctuation caused by circuit noi

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  • System and method for detecting lock-in threshold of double-longitudinal-mode laser gyroscope under tunable frequency
  • System and method for detecting lock-in threshold of double-longitudinal-mode laser gyroscope under tunable frequency
  • System and method for detecting lock-in threshold of double-longitudinal-mode laser gyroscope under tunable frequency

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[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention is a dual longitudinal mode laser gyro frequency tunable blocking threshold detection system, such as figure 1 As shown, it includes a ring laser. The ring laser consists of a symmetrical upper half-cavity ring laser 1 and a lower half-cavity ring laser 2. The distance between the upper half-cavity ring laser 1 and the lower half-cavity ring laser 2 is 0.30m~ 0.42m, and both the upper half-cavity ring laser 1 and the lower half-cavity ring laser 2 are fixed on the guide rail, and two corners of the lower half-cavity ring laser 2 away from the upper half-cavity ring laser 1 are respectively provided with laser beams capable of emitting laser beams. The first light-combining prism 3 and the second light-combining prism 18 are sequentially provided with a beam splitter 4 and an F-P frequency sweep cavity 5 along the ho...

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Abstract

The invention discloses a system and a method for detecting a lock-in threshold of a double-longitudinal-mode laser gyroscope under tunable frequency. The system comprises a ring laser, wherein lightcombining prisms are arranged at two corners of the ring laser respectively; a beam splitter and a reflector are arranged respectively in the horizontal positions of laser beams emitted by the first light combining prism; a photodetector, a first FPGA and a double-longitudinal-mode state controller are arranged respectively in the horizontal positions of laser beams reflected by the beam splitter;a double-optical-window photodetector, a second FPGA and a first computer controller are arranged respectively in the horizontal positions of laser beams reflected by the reflector; the ring laser isconnected with a digital test base, a rate turn table and a second computer controller through wires. The detection method comprises the following steps: firstly, working frequency of a ring resonantcavity is stabilized, then the rate turn table is started, when the ring laser is locked in, a synthesized Lissajous figure is observed on the first computer controller, and the lock-in threshold ofthe laser gyroscope is read out; according to the system, the detection process is simple, processing is fast, and an assembly result is accurate.

Description

technical field [0001] The invention belongs to the technical field of precision detection equipment, and in particular relates to a dual longitudinal mode laser gyro frequency-tunable blocking threshold detection system and detection method. Background technique [0002] Laser gyro is an ideal device for strapdown inertial navigation systems, and plays an important role in the fields of missile guidance, aircraft flight control, and aerospace remote sensing satellite attitude control. The laser gyro will be in a locked state during work. In this state, all the information reflecting the rotation of the gyro relative to the inertial space will be lost, and the gyro will fail. [0003] At present, the detection method of laser gyroscope locking threshold is generally aimed at single longitudinal mode laser gyroscope. This judgment method has the problem of pulse number fluctuation caused by circuit noise, which causes the problem of reading error of gyroscope locking threshol...

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Application Information

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IPC IPC(8): G01C25/00G01C19/66
CPCG01C19/662G01C25/005
Inventor 刘健宁焦明星邢俊红刘芸
Owner XIAN UNIV OF TECH
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