Modeling and analysis of dialyte-lens auto-focusing technology for theodolite

Lin-tao Wu; Yan-feng Qiao; Deng-Ke Wu; Sheng Cai

doi:10.1117/12.806990

2 February 2009 Modeling and analysis of dialyte-lens auto-focusing technology for theodolite

Lin-tao Wu, Yan-feng Qiao, Deng-Ke Wu, Sheng Cai

Proceedings Volume 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications; 71602E (2009) https://doi.org/10.1117/12.806990
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

In order to realize real-time auto-focusing for theodolite, lens-apart method was designed with the corresponding math model built and analyzed. An Object beam splitted after the first image surface of the theodolite traveled through two dialyte lens and then was imaged on CCD. The distance between two spots when exactly focused was set as the calibration value, and the relationship between defocus distance and spot offset was given. The influence of tracking center shift and divergence angle etc. on focusing accuracy was analyzed. Compared with the traditional focusing method, this scheme has a higher accuracy, faster calculation, higher tolerance for environment temperature and a simpler construction. The experiment result exhibited a resolution higher than 0.056mm, which shows a bright engineering application prospect for this method.

Citation Download Citation

Lin-tao Wu, Yan-feng Qiao, Deng-Ke Wu, and Sheng Cai "Modeling and analysis of dialyte-lens auto-focusing technology for theodolite", Proc. SPIE 7160, 2008 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Applications, 71602E (2 February 2009); https://doi.org/10.1117/12.806990

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KEYWORDS

Charge-coupled devices

CCD image sensors

Error analysis

Image processing

Mirrors

Stray light

Calibration

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