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Frequency modulation continuous wave ranging technology is widely used in industrial manufacturing. Because the on site working environment are complex, the measured target may have slight vibration. The Doppler frequency shift generated by the vibration leads to the beat frequency signal broaden of the frequency continuous wave ranging system generated by the reference light wave and the measuring light wave superposition, which decreases the measurement accuracy of the ranging system. This paper first analyzes the measurement principle of frequency modulation continuous wave ranging technology and the influence of target vibration to the range measurement accuracy. The analysis results show that the target vibration displacement can magnify the measurement error by dozens of times to hundreds of times. To address the above measurement error by the tiny vibration displacement, this paper proposed the vibration suppresses method on the frequency modulation continuous wave ranging based on the four-wave mixing effect. Firstly, the generation principle of four-wave mixing is introduced. The single-frequency laser is used as the pump light, and the tunable laser is used as the signal light. These two lights are simultaneously incident into the highly nonlinear fiber. The converted light is generated by the third-order parametric process of the nonlinear medium of the fiber. The converted light and the signal light from the tunable laser form a symmetrical light source with a completely opposite scanning direction. When the superimposed upper and lower scanning light are filtered by high-pass filtering, the vibration influence on the measurement signal is suppressed. Secondly the four-wave mixing frequency modulation continuous wave experimental system is built and the single-point measurement stability is verified. Based on the Mach-Zehnder interferometric measurement principle, a four-wave mixing effect frequency modulation continuous wave range measurement system is constructed. The statical target at 6.9m away was measured by this constructed ranging system. The distance of peak to bottom range is reduced from 199.8 μm before vibration suppression to 16μm, which improves more than 12 times. The ranging accuracy comparison experiment in the range of 6m ~ 7.2m was also carried out, and the ranging accuracy is lower than 9.4 μm. Experimental results show that the vibration suppression method based on four-wave mixing effect can effectively improve the measurement accuracy of the frequency modulation continuous wave ranging, which of great significance in the industrial scenes.
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Keywords:
- frequency-modulated continuous wave /
- four-wave mixing /
- vibration suppression /
- doppler shift
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