Share Email Print
cover

Proceedings Paper • new

Range walk error correction and modeling on Pseudo-random photon counting system
Author(s): Shanshan Shen; Qian Chen; Weiji He
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Signal to noise ratio and depth accuracy are modeled for the pseudo-random ranging system with two random processes. The theoretical results, developed herein, capture the effects of code length and signal energy fluctuation are shown to agree with Monte Carlo simulation measurements. First, the SNR is developed as a function of the code length. Using Geiger-mode avalanche photodiodes (GMAPDs), longer code length is proven to reduce the noise effect and improve SNR. Second, the Cramer–Rao lower bound on range accuracy is derived to justify that longer code length can bring better range accuracy. Combined with the SNR model and CRLB model, it is manifested that the range accuracy can be improved by increasing the code length to reduce the noise-induced error. Third, the Cramer–Rao lower bound on range accuracy is shown to converge to the previously published theories and introduce the Gauss range walk model to range accuracy. Experimental tests also converge to the presented boundary model in this paper. It has been proven that depth error caused by the fluctuation of the number of detected photon counts in the laser echo pulse leads to the depth drift of Time Point Spread Function (TPSF). Finally, numerical fitting function is used to determine the relationship between the depth error and the photon counting ratio. Depth error due to different echo energy is calibrated so that the corrected depth accuracy is improved to 1cm.

Paper Details

Date Published: 1 August 2017
PDF: 13 pages
Proc. SPIE 10339, Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers, 1033922 (1 August 2017); doi: 10.1117/12.2270162
Show Author Affiliations
Shanshan Shen, Nanjing Univ. of Science and Technology (China)
Jiangsu Key Lab. of Spectral Imaging and Intelligence Sense (China)
Qian Chen, Jiangsu Key Lab. of Spectral Imaging and Intelligence Sense (China)
Weiji He, Jiangsu Key Lab. of Spectral Imaging and Intelligence Sense (China)


Published in SPIE Proceedings Vol. 10339:
Pacific Rim Laser Damage 2017: Optical Materials for High-Power Lasers
Jianda Shao; Takahisa Jitsuno; Wolfgang Rudolph, Editor(s)

© SPIE. Terms of Use
Back to Top