Single-photon-array-based gating type diffuse reflection winding-angle imaging system and method

Abstract

The invention discloses a single-photon-array-based gating type diffuse reflection winding-angle imaging system and method. The system is composed of a laser emitter, a scanning galvanometer system, an intermediate reflecting surface, a distance gating module, a micro lens group, an SPAD array detector, a time-dependent photon counter and a digital processing unit. Laser emitted by the laser emitter is reflected by the surface of the intermediate reflecting surface, the surface of a hidden target, and the intermediate reflecting surface successively and then the reflected laser passes by the distance gating module; the laser is collected by the SPAD array detector; and the time-dependent photon counter is triggered. A time photon counting histogram is obtained according to the photon number and photon arrival time obtained by statistics by the time-dependent photon counter. And then the digital processing unit processes a plurality of time photon counting histograms according to a time sequential order to complete three-dimensional reconstruction of the hidden target object.

Description

Technical field [0001] The invention relates to a gated diffuse reflection round angle imaging system and method, in particular to a gated diffuse reflection round angle imaging system and method based on a single photon array. Background technique [0002] In the process of detecting and imaging hidden targets around the angle, the energy of the received light echo signal is extremely weak due to multiple diffuse reflections, usually to only a few photons, even single photons. Single photon is no longer continuous light, and the energy of single photon is very small. The photocurrent produced is lower than the noise of conventional photodetectors at room temperature. Therefore, to detect this extremely weak photon echo signal, special detection means are required . Photon counting using single-photon detectors for photon detection is an important low-light signal detection technology. It is used in long-range laser ranging, underwater target detection, atmospheric pollution mea...

AI Technical Summary

Problems solved by technology

The existing research on imaging around angles mostly uses streak cameras and iCCD (intensified Charge-Coupled Device) cameras as detectors, but streak cameras and iCCD cameras are very expensive and cannot be used in practical operations, and the detection range is small, and the data collected too long

Using a photoelectric hybrid device as a detector reduces the cost of experimental equipment, but the time resolution and spatial resolution that this device can provide are very low

In summary, the current angle-around imaging technology has great limitations in terms of high cost and imaging accuracy.

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