The application of image processing in the measurement for three-light-axis parallelity of laser ranger

Yang Wang; Qianqian Wang

doi:10.1117/12.806597

27 January 2009 The application of image processing in the measurement for three-light-axis parallelity of laser ranger

Yang Wang, Qianqian Wang

Proceedings Volume 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments; 71561R (2009) https://doi.org/10.1117/12.806597
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

When laser ranger is transported or used in field operations, the transmitting axis, receiving axis and aiming axis may be not parallel. The nonparallelism of the three-light-axis will affect the range-measuring ability or make laser ranger not be operated exactly. So testing and adjusting the three-light-axis parallelity in the production and maintenance of laser ranger is important to ensure using laser ranger reliably. The paper proposes a new measurement method using digital image processing based on the comparison of some common measurement methods for the three-light-axis parallelity. It uses large aperture off-axis paraboloid reflector to get the images of laser spot and white light cross line, and then process the images on LabVIEW platform. The center of white light cross line can be achieved by the matching arithmetic in LABVIEW DLL. And the center of laser spot can be achieved by gradation transformation, binarization and area filter in turn. The software system can set CCD, detect the off-axis paraboloid reflector, measure the parallelity of transmitting axis and aiming axis and control the attenuation device. The hardware system selects SAA7111A, a programmable vedio decoding chip, to perform A/D conversion. FIFO (first-in first-out) is selected as buffer.USB bus is used to transmit data to PC. The three-light-axis parallelity can be achieved according to the position bias between them. The device based on this method has been already used. The application proves this method has high precision, speediness and automatization.

Citation Download Citation

Yang Wang and Qianqian Wang "The application of image processing in the measurement for three-light-axis parallelity of laser ranger", Proc. SPIE 7156, 2008 International Conference on Optical Instruments and Technology: Optical Systems and Optoelectronic Instruments, 71561R (27 January 2009); https://doi.org/10.1117/12.806597

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KEYWORDS

Image processing

Laser processing

Image acquisition

Digital image processing

CCD cameras

LabVIEW

Mirrors

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