| Laser Doppler Velocimeter(LDV) is a precise instrument based on the theory of Laser Doppler Effect with no-touch measurement capability,quick responsibility, high precision,wide measurement range,multiple dimension measurement and direction judgement ability. LDV is applied extensively in the field of science research & education and industrial measurement. In this thesis, we researched on the high-precise signal processing in LDV.Due to existing signal processing technology's shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high-precise signal processing technology:firstly,to get power spectrum with Hanning windowed Welch modified periodogram, search its peak value frequency;secondly, to apply zooming analysis via Goertzel algorithm;at last,to get a highly precise doppler frequency with energy centrobaric rectifying algorithm。The simulating result indicated that this technology introduced could get accurate Doppler frequency。Depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. The running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. In a word, the technology improved LDV's performance such as measurement precision,measurement range,dynamic response time。And it will have a wide application foreground. |
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