A photon counting linear array readout circuit and method with adaptive detection mode
A photon counting and readout circuit technology, applied in the direction of instruments, etc., can solve the problems such as the decline of system detection accuracy, affecting the imaging quality, and the inability to automatically adjust the dead time, so as to achieve the effect of realizing imaging applications and improving detection efficiency.
Active Publication Date: 2019-07-23
SOUTHEAST UNIV
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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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[0026] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0027] Based on APD detector sensing technology and linear array scanning imaging technology, the present invention realizes a complete single photon detection application. On the one hand, it needs to overcome the missing count or miscount under specific conditions caused by the distribution of light intensity and wide dynamic range. On the other hand, It is necessary to design a reasonable sampling control mode and its system architecture for the large exposure time of weak light detection, and consider the matching method of data output and subsequent processors, and invented a photon counting line array readout circuit with adaptive detection mode . Through an in-depth understanding of the basic nature of discrete sampling in the Geiger mode of the APD and the inherent physical root cause of the decrease in counting accuracy, the dead zone time can be automa...
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The invention discloses a photon counting linear array readout circuit and method in an adaptive detection mode, including a synchronization module and a pixel array composed of several pixel units, each pixel unit including an APD detector, an interface circuit, a counter, memory and an adjustable dead time circuit; the adjustable dead time circuit is used to generate a reset signal to reset the interface circuit after a delay time according to the state of the received standard pulse voltage counting signal, and according to the received current exposure time The count value of the pixel is the count value of the current frame, and a control signal is generated according to the determined count value of the current frame to adjust the delay time of the next frame. The invention can automatically adjust the dead zone time by judging the intensity of light, and improves the detection efficiency. Through the cooperation with the sensor, it 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...
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IPC IPC(8): G01J11/00
CPCG01J11/00H04N25/773
Inventor 郑丽霞田江江翁子清张广超吴金孙伟锋
Owner SOUTHEAST UNIV