Investigation of range accuracy of gain-modulated laser range imaging

Chen-fei Jin; Zi-tong Song; Si-qi Zhang; Tian-yuan Qiao; Yuan Zhao; Li-ying Tan

doi:10.1117/12.2034755

19 September 2013 Investigation of range accuracy of gain-modulated laser range imaging

Chen-fei Jin, Zi-tong Song, Si-qi Zhang, Tian-yuan Qiao, Yuan Zhao, Li-ying Tan

Proceedings Volume 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications; 890524 (2013) https://doi.org/10.1117/12.2034755
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

A gain-modulated laser range imaging technology is generalized and its range accuracy is deduced. Theoretical results indicate that the range accuracy is proportional to the ratio of gain function to the derivative of the gain function and inverse proportional to output SNR. A gain-modulated laser range imaging system is established in our laboratory. It consists of a pulsed laser which is capable of generating laser pulses with a pulse width of 10ns and a center wavelength of 532 nm, and a receiver which is a digital 256×256 CCD sensor coupled to a GEN II intensifier with a 10nm bandwidth optical filter. Image intensifier is electronically driven and can be set to three modulated gain or constant gain. A range image of the target can be extracted by processing an intensity image with modulated gain and an intensity image with constant gain. Some indoor experiments are performed with sinusoidal, linear and exponential gain functions. The range images of the targets from 52 m to 58 m is taken and analyzed. Experimental results demonstrate the range accuracy with both sinusoidal and linear gain function depends on the relative range but one with exponential gain function independent of relative range. Specially, in the exponential gain function case the relatively small time constant can contribute to relatively high range accuracy.

Citation Download Citation

Chen-fei Jin, Zi-tong Song, Si-qi Zhang, Tian-yuan Qiao, Yuan Zhao, and Li-ying Tan "Investigation of range accuracy of gain-modulated laser range imaging", Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 890524 (19 September 2013); https://doi.org/10.1117/12.2034755

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KEYWORDS

Range imaging

Cameras

Modulation

Signal to noise ratio

Receivers

Image intensifiers

Laser applications

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