A data processing method based on tracking light spot for the laser differential confocal component parameters measurement system

Rongjun Shao; Lirong Qiu; Jiamiao Yang; Weiqian Zhao; Xin Zhang

doi:10.1117/12.2034881

23 December 2013 A data processing method based on tracking light spot for the laser differential confocal component parameters measurement system

Rongjun Shao, Lirong Qiu, Jiamiao Yang, Weiqian Zhao, Xin Zhang

Author Affiliations +

Proceedings Volume 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing; 90430L (2013) https://doi.org/10.1117/12.2034881
Event: International Conference on Optical Instruments and Technology (OIT2013), 2013, Beijing, China

Abstract

We have proposed the component parameters measuring method based on the differential confocal focusing theory. In order to improve the positioning precision of the laser differential confocal component parameters measurement system (LDDCPMS), the paper provides a data processing method based on tracking light spot. To reduce the error caused by the light point moving in collecting the axial intensity signal, the image centroiding algorithm is used to find and track the center of Airy disk of the images collected by the laser differential confocal system. For weakening the influence of higher harmonic noises during the measurement, Gaussian filter is used to process the axial intensity signal. Ultimately the zero point corresponding to the focus of the objective in a differential confocal system is achieved by linear fitting for the differential confocal axial intensity data. Preliminary experiments indicate that the method based on tracking light spot can accurately collect the axial intensity response signal of the virtual pinhole, and improve the anti-interference ability of system. Thus it improves the system positioning accuracy.

Citation Download Citation

Rongjun Shao, Lirong Qiu, Jiamiao Yang, Weiqian Zhao, and Xin Zhang "A data processing method based on tracking light spot for the laser differential confocal component parameters measurement system", Proc. SPIE 9043, 2013 International Conference on Optical Instruments and Technology: Optoelectronic Devices and Optical Signal Processing, 90430L (23 December 2013); https://doi.org/10.1117/12.2034881

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