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A Passive Laser Gyroscope Based on Phase Sensitive Heterodyne Measurement

A laser gyroscope and passive technology, applied in the field of laser gyroscopes, can solve problems such as backscattering noise, frequency drift in the free spectrum region, etc., to improve the resolution of rotation detection, solve the frequency drift in the free spectrum region, and improve the detection resolution Effect

Active Publication Date: 2022-02-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a passive laser gyroscope based on phase-sensitive heterodyne measurement, the purpose of which is to simultaneously solve the backscattering noise and cavity length drift in the existing passive laser gyroscope The problem of frequency drift in the free spectral region caused by

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  • A Passive Laser Gyroscope Based on Phase Sensitive Heterodyne Measurement
  • A Passive Laser Gyroscope Based on Phase Sensitive Heterodyne Measurement
  • A Passive Laser Gyroscope Based on Phase Sensitive Heterodyne Measurement

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no. 1 example

[0023] The invention provides a passive laser gyroscope based on phase-sensitive heterodyne measurement, figure 1 It is an overall structure diagram of the present invention, mainly consisting of a Sagnac interferometer 100, a balance detection device 200 and a signal extraction device 300; Ring cavity and three injection laser beams 1021, 1022, 1023; the four high reflectivity cavity mirrors 1011, 1012, 1013, 1014 include three input cavity mirrors 1011, 1012, 1013 and one output cavity mirror 1014; the three beam injection Lasers 1021, 1022, and 1023 are respectively injected into the optical ring cavity from three input cavity mirrors 1011, 1012, and 1013, wherein two beams of laser light 1021 and 1022 are injected clockwise along the ring cavity, and one beam of laser light 1023 is injected counterclockwise; The angular frequencies of the three laser beams are ω 1 , ω 2 and ω 3The balance detection device 200 includes a Mach-Zehnder interferometer 201 and a balance dete...

no. 2 example

[0033] like image 3 and Figure 4 As shown, the present embodiment provides a passive laser gyroscope based on phase-sensitive heterodyne measurement, image 3 It is an overall structure diagram of the present invention, mainly consisting of a Sagnac interferometer 100, a balance detection device 200 and a signal extraction device 300; Ring cavity and three injection laser beams 1021, 1022, 1023; the four high reflectivity cavity mirrors 1011, 1012, 1013, 1014 include three input cavity mirrors 1011, 1012, 1013 and one output cavity mirror 1014; the three beam injection Lasers 1021, 1022, 1023 are respectively injected into the optical ring cavity from three input cavity mirrors 1011, 1012, 1013, wherein two beams of laser light 1021 and 1022 are injected counterclockwise along the ring cavity, and one beam of laser light 1023 is injected clockwise; The angular frequencies of the three laser beams are ω 1 , ω 2 and ω 3 ; The balance detection device 200 includes a Mach-Z...

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Abstract

The invention discloses a passive laser gyroscope based on phase-sensitive heterodyne measurement, which includes a Sagnac interferometer, a balance detection device and a signal extraction device; three laser beams are respectively locked to three different longitudinal modes in two directions of the Sagnac interferometer ; The laser transmitted from the Sagnac interferometer enters the balance detection device for beat frequency measurement; the radio frequency electrical signal obtained by the beat frequency measurement is self-demodulated through the signal extraction device to obtain the Sagnac signal, and the rotational angular velocity is determined through this signal. The invention avoids the backscattering noise of the laser gyroscope and the drift noise of the optical cavity length by injecting three laser beams into the passive laser gyroscope, improves the interference signal-to-noise ratio of the laser gyroscope, and improves the measurement stability of the passive laser gyroscope at the same time, and obtains better rotation measurement resolution.

Description

technical field [0001] The invention belongs to the field of laser gyroscopes, and more specifically relates to a passive laser gyroscope based on phase-sensitive heterodyne measurement. Background technique [0002] Laser gyroscopes are used in inertial navigation, geophysics, fundamental physics and other fields due to their excellent rotational rate measurement performance. Over the past 40 years, laser gyroscopes have become one of the most important instruments in the fields of inertial navigation and precision rotation measurement. Due to its high resolution, good stability, and wide dynamic range, it is favored by researchers in scientific research and industry. The working principle of the laser gyroscope is based on the Sagnac effect proposed by the French scientist Sagnac in 1913, that is, in an optical ring cavity, if the system rotates in the plane of light propagation, the light propagating clockwise and the light propagating counterclockwise The actual optica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
CPCG01C19/72G01C19/721
Inventor 李宗阳张洁柳奎冯晓华陆泽晃
Owner HUAZHONG UNIV OF SCI & TECH
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