Testing method of bandwidth and angular resolution of four-frequency differential laser gyroscope
A laser gyro and four-frequency differential technology, which is applied in the field of testing, can solve the problems of high price, difficult control of mechanical vibration bandwidth and resolution, unreliable angular resolution evaluation accuracy of high sampling rate laser gyro, etc.
Active Publication Date: 2020-04-17
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
In a report "Raytheon High resolution angular sensors" published by Raytheon in 1981, it was proposed to use a mechanical vibration table to measure the angular resolution of the four-frequency differential laser gyroscope. Since the high-resolution measurement of the vibration amplitude is inherently difficult, coupled with the The bandwidth and resolution of the mechanical vibration are not easy to control, so the measurement method based on the mechanical vibration table has limited accuracy and is expensive;
[0022] Carrying out Allan variance analysis on the four-frequency differential laser gyroscope test data can theoretically obtain a quantity representing the angular resolution. Unreliable accuracy of angular resolution assessment of
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[0050] The specific embodiment is described in detail below in conjunction with accompanying drawing:
[0051] figure 1 , figure 2 It is a schematic diagram of the mode distribution on the four-frequency differential laser gyro structure and its gain curve. Inflatable and light ducts are processed on the low-expansion cavity 1, and four reflectors 5, 6, 7, 8 are installed on the four corners of the cavity, of which 7 is an output mirror. Two anodes 2, 3 and one cathode 4 are used to provide gain. The reciprocal frequency bias element is realized by the non-planar spatial structure of the low-expansion cavity 1 (the optical path in the low-expansion cavity 1 is processed into a non-planar spatial structure, see reference for details: Dorschner TA.Nonplanar rings for laser gyroscopes[C]Proc SPIE 487:192-202.), provides a bias frequency between gyros I and II of a four-frequency differential laser gyro (gyros I and II are left-handed and right-handed gyros, respectively) to a...
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The invention discloses a four-mode differential laser gyro bandwidth and angular resolution testing method. By magnetically-induced null bias of a four-mode differential laser gyro, a magnetic fieldis applied to the four-mode differential laser gyro through a bandwidth magnetic field generator, output beat frequency pulse is recorded, magnetic field signal types and beat frequency pulse samplingtime are selected according to measurement requirements, and data are processed to obtain bandwidth and resolution ratio. The method has advantages of accuracy, quickness and low cost.
Description
technical field [0001] The invention relates to bandwidth and angular resolution testing of a four-frequency differential laser gyroscope, and belongs to the technical field of testing. Background technique [0002] Laser gyro has the advantages of large dynamic range, no acceleration effect, and simple structure. 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 the laser gyro rotates around the sensitive axis relative to the inertial space, the frequency of the opposite traveling waves is split to form a difference frequency proportional to the rotation rate. Therefore, the rotation information of the laser gyro relative to the inertial space can be obtained by measuring the difference frequency. [0003] Due to the backscatte...
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IPC IPC(8): G01C25/00G01C19/64
CPCG01C19/64G01C25/005
Inventor 汪之国罗晖张燚
Owner NAT UNIV OF DEFENSE TECH