A vibration compensation method for frequency scanning interferometric absolute ranging system
A technology of frequency scanning interference and ranging system, which is applied in the field of vibration compensation of frequency scanning interference absolute ranging system, can solve the problems of widening distance spectrum and large measurement error, and achieve the advantages of light weight, convenient integration and low hardware cost Effect
Active Publication Date: 2022-07-08
TIANJIN UNIV
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[0003] But in actual measurement, with the existence of the Doppler effect caused by vibration, the distance spectrum will widen, which will cause the measurement error to be more than 1000 times larger than the actual change of optical path difference
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[0053] In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:
[0054] The invention proposes a vibration compensation method using a single-frequency laser, an acousto-optic modulator and the original frequency scanning interference absolute ranging system, and its feasibility is verified through theoretical derivation.
[0055] The frequency scanning interferometric absolute ranging system device used in the present invention is as follows figure 2 As shown, including a single-frequency laser 1 and a tunable laser 22, the single-frequency laser 1 is divided into A and B through the first beam splitter 2, and the tunable laser 22 is divided into a second beam splitter 21. The C and D paths, the A, B, and C paths enter the measurement interference system 15 , and the D path enters the auxiliary interference system 16...
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The invention discloses a vibration compensation method for a frequency scanning interference absolute ranging system. A single-frequency laser and two acousto-optic modulators are used to generate a beat frequency signal with Doppler frequency shift information. The optical path also generates measurement beat signals containing Doppler information, and processing the two measurement beat signals can eliminate the influence of vibration on the frequency scanning interferometric absolute ranging system. Compared with the dual tunable laser measurement system, the invention reduces the hardware cost and device complexity. At the same time, the single frequency laser is smaller in volume and quality than the tunable laser, and is easier to integrate and use in the field. The dual tunable laser also The same frequency modulation speed is required, which is almost impossible at present, because the tunable laser generally has the phenomenon of frequency modulation nonlinearity, and the present invention uses a single frequency laser to avoid this problem well.
Description
technical field [0001] The invention relates to the field of frequency scanning interferometric absolute ranging, in particular to a vibration compensation method of a frequency scanning interferometric absolute ranging system. Background technique [0002] The absolute distance measurement system can be used for distance measurement up to tens of meters with relative uncertainty less than 3ppm, which is of great significance in the field of measurement. Absolute distance measurement systems can improve the manufacturing efficiency and precision of large assemblies in areas such as aircraft construction, automotive engineering and modern windmill blade production. Current absolute distance measurement systems are generally based on three different optical methods: time-of-flight method, synthetic wavelength method, and frequency-sweeping interferometry. Frequency scanning interferometric absolute ranging technology is a ranging method that can quickly measure the surface in...
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IPC IPC(8): G01S17/32G01S7/481
CPCG01S7/4817G01S17/34
Inventor 张福民李雅婷曲兴华
Owner TIANJIN UNIV