| Summary: | 碩士 === 中華大學 === 電機工程研究所 === 86 === Most of the current inspections of objects use the digital image processing method. The use of optical system and optical signal processing can offer significant advantages over the digital image processing. These advantages include high-speed analog multiplication, parallel processing capability, and close to the real time processing when large numbers of data are to be processed. The purpse of this paper is to construct an incoherent optical correlator system for the inspection of shape deflection of objects by using the optical signal processing method. Besides, the computer simulation will also be included for the comparisons between the simulated and experimental results.
The incoherent optical correlator consist of an imaging lense, an LCD and an integrating lense, which offers advantages including simple construction, small size and less weighy. The experimental method in this paper consisted of the pattern moving method and the object moving method. By comparing the experimental results with simulated results, the average experimental error in pattern moving meihod was 5.67% and the average experiment error in the object moving method was 11.75%, which had shown that the experimental results by both the moving methods are in good agreements with simulated results.The simulations used the digital image processing method and tood 40 minutes for a complete calculation of inspection of one object. The measurement time of experiment in pattern moving method is 0.75 times that of simulation and the measurement time of experiment in object moving method is 6.04×10-3 times that of simulation. Therefore, the incoherent optical correlatior system has shown the capability of fast inspection for the shape deflections of objects.
In this paper, the incoherent optical correlator system has shown a practical technique for the inspection of teh deflected direction and the actual deflection of objects by a correction factor. Therefore, the results of this research work have had contributions of great value to further research and industrial application in the fast inspections of objects.
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