A micro-Doppler vibration measurement system and method based on a two-way acousto-optic frequency comb
A technology of vibration measurement and frequency comb, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of reducing detection bandwidth requirements and limiting application range, and achieves the effect of ensuring adaptability and reducing bandwidth requirements
Active Publication Date: 2022-03-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
Due to the directionality of the Doppler frequency shift, the traditional acousto-optic frequency comb can only reduce the detection bandwidth requirements for the measurement of targets moving in a certain direction, which greatly limits its practical application range
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[0022]The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and an embodiment of micro-Doppler vibration measurement of a moving target based on a pulse-injected bidirectional acousto-optic frequency comb in the 1530nm band.
[0023] The main devices adopted in the present invention are described as follows:
[0024] 1. Seed laser 1: a frequency-stabilized distributed feedback laser diode with a central wavelength of 1529.55nm (FRL-15DCWD-A81-19600-C, FITEL), fiber-coupled output.
[0025] 2. The first optical fiber coupler 2, the second optical fiber coupler 4, and the third optical fiber coupler 14: produced by RUIK Company, the splitting ratios are 90:10, 50:50, and 50:50, respectively.
[0026] 3. Fiber delay line 5: PM1550 polarization maintaining fiber about 1 km long.
[0027] 4. Narrowband filter 7, circulator 12, and optical collimator 13: manufactured by RUIK, the narrowband filter bandwidth is 10...
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The invention discloses a micro-Doppler vibration measurement system and method based on a two-way acousto-optic frequency comb. The system first modulates a seed laser and then injects it into a frequency-shifting loop. The frequency-shifting loop includes an optical fiber delay line, an optical amplifier, and a narrow-band filter. And the special frequency shift configuration and its driver that can shift frequency forward or reverse, and finally output the pulsed bidirectional acousto-optic frequency comb, and then output to the detection target after passing through the optical amplifier, circulator and optical collimator; the target echo signal The fiber coupler is combined with the single-frequency seed laser to obtain multi-heterodyne beat frequency signals, so as to realize the micro-Doppler vibration measurement of moving targets. The advantage of the present invention is that the intermediate frequency signal containing the micro-Doppler vibration information of the high-speed moving target can be obtained under a relatively low detection bandwidth, so as to accurately invert the vibration characteristics of the high-speed moving target.
Description
technical field [0001] The invention relates to Doppler vibration measurement and generation technology of acousto-optic frequency comb, in particular to a micro-Doppler vibration measurement system and method based on two-way acousto-optic frequency comb. Background technique [0002] Laser Doppler vibration detection technology is a non-contact, high-resolution, high-precision vibration detection technology based on the Doppler effect. This technology has been widely used in the fields of aerospace, biomedicine, precision machining and ultrasonic testing. The basic principle is to use the Doppler effect of the echo signal of the vibrating target to invert the vibration characteristics of the target in the laser irradiation direction. In actual measurement, it is often necessary to measure a moving target, which will cause the micro-Doppler signal of the target vibration to be superimposed on the Doppler frequency shift signal of the macro-motion of the target. At this ti...
Claims
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 陈滔陈新孔伟乐文杰尹路舒嵘
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI