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

A single-photon counting, digital phase-locking technology, applied in the field of optical measurement, can solve the problems of low sensitivity, poor noise suppression, affecting the accuracy of measurement results, etc., to achieve high sensitivity, reduce measurement errors, and overcome the effects of long measurement time

Inactive Publication Date: 2011-09-14
TIANJIN UNIV
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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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  • Multi-channel single photon counting measuring system based on digital lock phase de-multiplex

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Embodiment Construction

[0034]The invention provides a multi-channel optical parameter measurement system and measurement method based on single photon counting and digital phase-locking. The core of the invention is to perform digital phase-locking and demultiplexing on frequency division multiplexed signals.

[0035] The present invention proposes a multi-channel measurement system based on digital phase-locking, the composition block diagram is shown in figure 1 ,include:

[0036] 1. The light source part, see the composition block diagram figure 2 , mainly including N group modulators and laser diodes, and fiber couplers. The number of N depends on system requirements.

[0037] (1) The modulator is used to drive the laser, and adjust the driving current according to the input analog signal waveform, so as to modulate the amplitude of the laser.

[0038] (2) Laser diodes, which generate laser light of a specific wavelength.

[0039] (3) Optical fiber coupler, which couples several lasers wit...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42G01J1/02A61B5/00
Inventor 高峰赵会娟侯少华
Owner TIANJIN UNIV
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