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Experimental Study on Laser Ranging with Time-Correlated Single Photon Counting Techniques

Author: WangZuoJi
Tutor: ChenDeYing
School: Harbin Institute of Technology
Course: Physical Electronics
Keywords: Time-correlated single photon counting Signal-to-noise ratio Photomultiplier tube Laser Ranging Measurement accuracy
CLC: TN247
Type: Master's thesis
Year: 2011
Downloads: 186
Quote: 0
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Abstract


Time-correlated single photon counting (TCSPC) is an effective means of detecting the single-photon signal, able to give a photon is detected by the time the photon distribution function over time, and set up in the signal period. Time-correlated single photon counting technique is widely used in the field of biological research, fluorescence lifetime measurement, laser imaging radar. TCSPC technology, first introduced the basic principles of the technology and system solutions; TCSPC characteristics of the amplifier to test the performance analysis; TCSPC technology used in laser ranging. The impact of the detector signal-to-noise ratio in the time-correlated single photon counting technique, but the researchers did not made a detailed study of this. Described in the literature abroad, the detector performance analysis. Photomultiplier dark count and total number of analysis of the relationship with the supply voltage variation, verify that a curve having a flat area, by comparison with the corresponding SNR proved flat region can make the best SNR, and The detector is in steady-state operation; according to the principle of photomultiplier tube and photon statistical distribution, the distribution of the amplitude of the output pulse of the photomultiplier tube, proved by experiments that point of view, and a photomultiplier tube output signal pulse amplitude the law of value distribution, further study found that dark counts are mainly concentrated in the region of low amplitude, photon counting in the area of ??high amplitude peak. Thus, to prove that the optimum operating voltage in to select count - vs.Discharge the flat region, the optimal discrimination level for the total number of troughs of the amplitude distribution curve point. In view of the time-dependent single-photon counting technique with high time resolution accuracy and sensitivity, so the technology used in laser ranging. Most of the commercialization of short-range laser rangefinder measurement accuracy of the order of meters, and rarely seen in the country applied this technique in laser ranging. In this paper, the short-range laser ranging based research, time - digital converter (time measurement unit) as the time interval measurement unit. Through research, Laiyi Da select the algorithm and the median filter and the methods used for data processing, which is helpful in reducing the error of the measurement results, to improve the measurement accuracy. In addition, through the detection efficiency of the experimental maximum measurement distance, measure the distance from the target size. 5m and 7m short distance experiment, to obtain a good experimental results. According to the experimental results and theoretical analysis obtained the system in the short-distance ranging minimum measurement accuracy can reach centimeter, pulse energy can be used for micro-focus middleweight laser as a light source for miniaturized laser rangefinder lay the foundation.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Optical detection techniques
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