Complementary-measurement time resolution single-photon spectrum counting imaging system and method

Abstract

The invention provides a complementary-measurement time resolution single-photon spectrum counting imaging system and method. The system consists of an optical portion and an electric portion, the optical portion images light on a spatial light modulator, light is modulated and then emitted to two arm directions to be aligned and split, and the electric portion completes detection, control, calculation and the like. The method includes that invisible light and near infrared single-photon detector linear arrays simultaneously detect spectrums of emergent light of two arms of the spatial light modulator, one arm detects visible light spectrum while the other arm detects near infrared spectrum, complementary measurement, maximum luminous flux and high sensitivity can be realized; picosecond time resolution of a periodic object is realized by means of time amplitude variation or delay gate width counting, and second time resolution of a non-periodic object is realized by means of measurement frame by frame; color video frame sequences of visible light and near infrared light can be obtained simultaneously by means of associated compression sensing algorithm according to matrix complementation, and imaging quality is improved while imaging speed is increased; and time resolution spectrograms are counted up for spectral analysis.

Description

technical field [0001] The invention relates to the technical field of time-resolved imaging spectroscopy, in particular to a time-resolved single-photon spectrum counting imaging system and method for complementary measurement. Background technique [0002] In high-tech fields such as time-resolved imaging spectroscopy, biological component detection, starry sky detection, night vision, remote sensing imaging, medical imaging, quantum dot imaging, etc., there is a demand for time-resolved simultaneous detection of visible light spectrum and near-infrared light spectrum It is becoming more and more obvious that, in addition, the traditional time-resolved imaging spectrometer has the defect that the spatial resolution and time resolution cannot meet the high precision at the same time, and imaging and spectroscopy generally require two special instruments to complete, and the response range of the spectrum is also very limited. A new time-resolved imaging system is needed to ...

AI Technical Summary

Problems solved by technology

When the bin detector detects the extremely weak light, it needs to be exposed for a certain time (that is, the integration time). The light intensity value on this pixel has a sensitivity problem

Among them, ICCD and EMCCD claim to be able to achieve single photon detection, but they need deep semiconductor cooling, which is expensive, ICCD has poor spatial resolution, and the time resolution accuracy reaches nanosecond level, while EMCCD has slightly better spatial resolution, but the time resolution can only reach nanosecond level. On the order of milliseconds, the common problem is that it is difficult to control the noise of the instrument or output linearly under low light; while APDs can work in Geiger mode, but it is still in the research stage, and it is difficult to manufacture and maintain high-precision APD arrays. Taped out, the APD array announced by Lincoln Laboratory is only 64×256 pixels, which is embargoed to China, and the current APD array has a very limited wavelength response range, and only reaches the peak quantum efficiency in the mid-visible band. Because each pixel are extremely small, the luminous flux must be evenly distributed on the entire array, then the impact of shot noise will become very significant

[0007] Although the response spectrum range of current single-photon detection elements covers infrared, visible light and other bands, for a single single-photon detection element, its response spectrum range is very narrow, and it is generally used to detect light of a single frequency.

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