Multi-channel single photon counting measuring system based on digital lock phase de-multiplex

Abstract

The invention belongs to the field of optical measurement, relating to a multi-channel single photon counting measuring system based on digital lock phase de-multiplex. The system comprises a light source part, a measuring part, a digital-to-analogue conversion circuit, a digital circuit, a communication circuit and a computer, wherein the digital circuit outputs a digital sine to obtain a simulative sine wave through the digital-to-analogue conversion circuit, a laser modulator modulates the amplitude of a laser and couples a plurality of beams of modulated lasers with different frequencies into one beam to form into a light source of frequency division multiplexing, the light source irradiates an object to be measured, an emitted weak diffused light is captured by a single photon counting measurer, and an electric pulse is outputted through a circuit; and the digital lock phase arithmetic which is tightly combined with the single photon counting is realized by the digital circuit, and a mixed signal from different light resources is extracted in a separating way in a passageway of the measurer according to a preset parameter when receiving the electric pulse to obtain the intensity information of an emergent light which corresponds to each light source. The system shortens the measuring time, reduces the complexity thereof, improves the flexibility of the circuit, and reduces the measuring error.

Description

technical field [0001] The invention belongs to the field of optical measurement, in particular to a multi-channel single-photon counting measurement system based on digital phase-locking and demultiplexing. Background technique [0002] With the progress of society, human beings pay more and more attention to their own health, and people pay more and more attention to health-related detection methods and early diagnosis and treatment methods. Optical-related detection and diagnosis and treatment methods have the advantages of high resolution, multi-parameters, and high spatiotemporal resolution, and have the advantages of minimally invasive or even non-invasive and non-ionization in medical diagnosis. Therefore, optical correlation methods have broad application prospects in medical diagnosis and treatment. [0003] Biomedical photonics is photomedicine and photobiology developed on the basis of the theory of tissue optics. Tissue optics can be understood as the knowledge...

AI Technical Summary

Problems solved by technology

If a continuous working detector is used, such as a photodiode, etc., and then the post-stage amplification and sampling are performed, this method has low sensitivity and poor noise suppression, which affects the accuracy of the measurement results to a certain extent

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