A first-photon laser imaging system based on photon labeling

Abstract

The invention relates to a photon marking based first photon laser imaging system, which comprises a photon coding system, an 1*N laser array (2), a light path turning element (3), a two-dimensional scanning device (4), a beam focusing element (6), a photon decoding system (7), a 1*N single-photon detector array (8), a multichannel time-correlated single photon counting system (9) and a control and data acquisition system (10). The first photon laser imaging system adopts a photon marking algorithm and a high repetition frequency first photon imaging algorithm, can overcome a problem that the pulse repletion frequency of an existing first photon laser imaging system is limited and difficult to be improved, improves the data acquisition speed of the first photon laser imaging system, and shortens the first photon laser imaging time.

Description

technical field [0001] The invention belongs to the technical fields of optical imaging and photon counting laser imaging, and relates to a first-photon laser imaging system capable of rapid imaging. Background technique [0002] The traditional laser radar adopts a linear detection system. The laser echo pulse contains thousands of photons, and the echo signal is detected from the background noise by a high signal-to-noise ratio. This high laser emission energy limits the laser repetition rate. , data sampling rate and maximum operating distance. In order to solve this problem, lidar is developing towards the direction of low emission energy, high repetition frequency, and high sensitivity detection. At present, the most common one is photon counting laser three-dimensional imaging technology, represented by NASA and MIT Lincoln Laboratory. Repetition frequency, low-energy laser transmitter and high-sensitivity single-photon detector convert the echo waveform detection con...

AI Technical Summary

Problems solved by technology

Once the repetition rate of the laser exceeds this threshold, the time information of the response photons may appear periodic aliasing, so that the reflectivity information and elevation information of the target cannot be retrieved correctly

Moreover, the current first-photon imaging system works under the condition of extremely low echo intensity. When the detector responds to the first photon, the laser needs to emit multiple pulses, and the limitation of the repetition rate often prolongs the data acquisition time of the system, thus It affects the timeliness of system imaging, which is not conducive to its imaging of moving or changing target scenes, and has great limitations in application

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