Fast adaptive laser ranging system and method based on silicon photomultiplier

By designing an aperture and signal processing module in the laser ranging system, combined with a temperature-compensated power supply module, the problems of insufficient utilization of the silicon photomultiplier tube detection surface and the influence of background light were solved, achieving adaptive adjustment and high-sensitivity ranging.

CN116299508BActive Publication Date: 2026-07-24NANJING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202310201799.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-03
Publication Date
2026-07-24
Estimated Expiration
2043-03-03

AI Technical Summary

Technical Problem

Existing laser ranging systems fail to fully utilize the detection surface of silicon photomultiplier tubes and are susceptible to background light, making it impossible to adjust the threshold voltage in real time.

Method used

The aperture is designed so that its opening is located on the focal plane and has the same area as the focal plane. By calculating the distance between the photosensitive surface and the aperture, the echo signal covers the receiving surface of the silicon photomultiplier tube. At the same time, a signal processing module measures the output voltage in real time and adjusts the threshold voltage through a comparator. Combined with a power supply module with temperature compensation function, the silicon photomultiplier tube is stabilized.

Benefits of technology

It achieves adaptive adjustment when the background light changes, making full use of the characteristics of silicon photomultiplier tubes, and improving the sensitivity and accuracy of the ranging system.

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Abstract

The application discloses a kind of fast adaptive laser ranging system and method based on silicon photomultiplier, data processing module start timing control circuit, drive pulse laser transmitter generates laser, and is shaped by transmitting lens assembly, irradiates to measured object, time digital conversion module synchronous start timing;Echo light signal is received by receiving lens assembly and is evenly distributed in silicon photomultiplier receiving surface by diaphragm, carries out photoelectric conversion, and then signal is amplified by amplifying circuit;Signal processing module measures background light intensity in real time as threshold voltage output to comparator, is shaped and discriminated by comparator, obtains effective signal and is transmitted to time digital conversion module while ending timing;By comparing the time delay between start timing signal and end timing signal, the target distance position is obtained.The application can sufficiently reduce the influence of background light, quickly collect distance information, and keep the overvoltage of silicon photomultiplier constant by automatic voltage adjustment.
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