High dynamic range imaging method based on superconducting nanowire detector

Abstract

The invention discloses a high dynamic range imaging method based on a superconducting nanowire detector. The high dynamic range imaging method comprises a flux estimation method based on SNSPD response counting under high flux and a flux estimation method based on PNR-SNSPD output energy under ultrahigh flux. Under high flux, the SNSPD works in a linear mode, and the flux estimation method based on SNSPD response counting comprises equivalence of detector efficiency recovery time and establishment of a flux estimation model. Under the ultrahigh flux, the SNSPD works in a quasi-linear model, and the flux estimation method based on the output energy of the PNR-SNSPD comprises correction of energy ET and N and establishment of a flux estimation model. The detectable high dynamic range of the superconducting nanowire detector is obtained by integrating the two methods. By means of the method, high-dynamic-range imaging with the luminous flux of 109: 1 or above can be effectively achieved, and the dynamic range of the superconducting nanowire imager can be expanded through modeling and simulation.

Description

technical field [0001] The invention relates to the technical field of high dynamic range imaging, in particular to a high dynamic range imaging method based on a superconducting nanowire detector, which improves the high dynamic range imaging capability of the detector. Background technique [0002] In astronomical observation and imaging applications such as coronagraphs, a detector with an ultra-high dynamic range is required to estimate the luminous flux of the scene. It not only requires the detector to have the ability of single-photon detection to achieve luminous flux estimation under weak light, but also requires the detector to have a high The high count rate ensures that the detector will not be saturated in strong light scenes, so as to achieve luminous flux estimation under strong light. [0003] The key idea of ​​traditional high dynamic range imaging using CMOS or CCD is similar to combinatorial printing, i.e. capturing the same high dynamic scene at different...

AI Technical Summary

Problems solved by technology

The efficiency recovery time of the currently reported single-pixel SNSPD is less than 10ns, and the maximum count rate can reach 100MHz, but it does not have the photon number resolution capability

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