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Moire grating CCD subdivision research

Author: SunMingJie
Tutor: ChangLi
School: Shenyang University of Technology
Course: Detection Technology and Automation
Keywords: Moire grating Linear CCD All phase DFT FPGA
CLC: TP212
Type: Master's thesis
Year: 2012
Downloads: 154
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Abstract


Precision displacement measurement in industrial production plays an important role in the theory of moire grating-based displacement measurement due to its high accuracy and low cost in precision displacement measurement is significant. Moire grating signal is a periodic signal , in order to obtain a higher displacement resolution , the need for raster moire signals subdivision. Current raster moire subdivided in many ways, mainly for two grating cosine output signal , because the actual existence of moire orthogonality error signal , the amplitude fluctuation error , not easy to achieve a constant periodic error , etc. high multiple segments . Therefore, this paper uses the CCD moire grating is collected on the fringe signal segments treatment using all phase DFT algorithm . CCD image sensor image acquisition can get a full cycle of Moire fringe , fringe signal according to the phase difference between two measurements obtained displacement values ??. Collection moire signal amplitude fluctuation signal processing methods can be compensated for one signal can be broken down and identified to achieve , there is no non-constant periodic problems. CCD moire collected for the equivalent analog signal sampling, to striped digital signal processing segment basis , all phase DFT algorithm with phase invariance, spectral leakage is small, and the traditional DFT simulation through contrast , all phase DFT algorithm in the non- whole cycle sampling phase calculation accuracy, the initial phase fringe signals at different values ??of strike in the early phase error is small , there is conducive to the realization of high-precision calculation moire phase . Model design uses TCD1501C linear CCD image sensor , using AD9816 converter for converting the output signal of the CCD . And AD CCD drive timing generated by the FPGA , all phase DFT algorithm is fully implemented within the FPGA , complex values ??into spectral phase values ??using the CORDIC arctangent algorithm , all phase DFT algorithm and the CORDIC algorithm arctangent of delay 26 clock cycles that can be output. Using a grating pitch of 20μm displacement sensor signal 400 can be achieved Moire subdivision , resolution reaches 50nm. System has high integration , high reliability , with a certain application value.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor
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