Photon counting linear array readout circuit and method in adaptive detection mode

Abstract

The invention discloses a photon counting linear array readout circuit and method in an adaptive detection mode. The photon counting linear array readout circuit comprises a synchronization module and a pixel array formed by a plurality of pixel units. Each pixel unit comprises an APD detector, an interface circuit, a counter, a storage device and a dead time adjustable circuit. The dead time adjustable circuit is used for generating a reset signal for enabling the interface circuit to reset according to the received standard pulse voltage counting signal state after a delay time, and generating a control signal to adjust delay time of the next frame according to a count value, that is, the count value of the current frame, of pixels within current exposure time, and according to the judged count value of the current frame. The photon counting linear array readout circuit and method can judge light intensity to automatically adjust the dead time, thereby improving detection efficiency; and through coordination with the sensor, the photon counting linear array readout circuit and method in the adaptive detection mode can be reasonably applied to a large-array readout circuit system, thereby realizing imaging application.

Description

technical field [0001] The invention relates to a photon counting linear array readout circuit and method in an adaptive detection mode, and belongs to the technical field of photon counting imaging. Background technique [0002] Photon counting imaging technology uses photodiodes with single-photon detection sensitivity to obtain the two-dimensional distribution of weak light signals through high-precision sampling and inversion calculation of the target scene, and then obtain the photon image of the target scene. Due to its high sensitivity, high signal-to-noise ratio, and good time stability, photon counting detection has a wide range of applications in many fields such as lidar, spectroscopy, and quantum key distribution. The avalanche photodiode (APD) solid-state single-photon detector is a solid-state device that utilizes the ionization effect of the collision of semiconductor carriers in the strong electric field region to excite a large avalanche current. When the r...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a photon counting linear array readout circuit and method in an adaptive detection mode, and solve the problem that the dead time in the existing photon counting circuit cannot be automatically adjusted, which will cause system The detection accuracy decline affects the imaging quality. The dead time automatic adjustment circuit technology can reduce the light intensity wide dynamic range distribution and cause the missing count and miscount under certain conditions.

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