All-fiber single-photon temperature sensor with long distance and high spatial resolution

A high spatial resolution, temperature sensor technology, applied to thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of low spatial resolution and insufficient distance of temperature monitoring, and achieve improved spatial resolution and dark Effect of low count and low transmission loss

Inactive Publication Date: 2017-07-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of the existing temperature sensor system, such as low temperature monitoring spatial resolution and insufficient distance, and adopt time-correlated single photon detection technology to realize real-time monitoring of temperature with long distance and high spatial resolution

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  • All-fiber single-photon temperature sensor with long distance and high spatial resolution
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  • All-fiber single-photon temperature sensor with long distance and high spatial resolution

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Its composition of the system that the present invention proposes is as figure 1 As shown, it includes a laser light source 1 , a fiber optic circulator 2 , a multi-channel optical switch array 3 , a sensing fiber 4 and a signal acquisition and processing module 5 . During demodulation, the optical pulse emitted by the laser light source 1 enters the multi-channel optical switch array 3 through the circulator 2, and is distributed to different sensing fibers 4 by the multi-channel optical switch array 3. When the optical pulse transmits in the sensing fiber 4, it excites Stokes Raman scattered light and anti-Stokes Raman scattered light, the scattered signal returns to the signal acquisition and processing module 5 through the optical fiber circulator 2, and the temperature information is demodulated by the signal acquisition and process...

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Abstract

The invention discloses an all-fiber long-distance high-spatial-resolution single-photon temperature sensor. The laser light source of the sensor adopts a low-energy picosecond-level light emission module, and the signal acquisition and processing module adopts single-photon counting technology for Stokes Scattered light and anti-Stokes scattered light are calculated, the Raman scattering principle of quantum physics is combined with mathematical probability statistics, and the single photon counting technology and gating technology are combined to improve the spatial resolution of temperature monitoring. Using single-mode fiber as the sensing fiber has lower transmission loss than multimode fiber and is more suitable for long-distance temperature detection. The detector used is a single-photon detector, which has the characteristics of low dark count, wide response spectrum, and fast repetition speed, and is suitable for the detection of weak signals. The time recording module used is a time-correlated single photon counter, which can measure the correlation time of a single photon pulse with high precision, and the time resolution is very high.

Description

technical field [0001] The invention is an all-fiber long-distance high-spatial-resolution single-photon temperature sensor, which is used for real-time monitoring of temperature information at an ultra-long-distance (nearly 100 km) high-spatial resolution (centimeter level). Background technique [0002] Distributed optical fiber Raman temperature sensor is a high-tech developed in the past ten years for real-time measurement of space temperature field. The optical fiber used in the sensor is both the light transmission medium and the temperature sensing medium. Using the Raman scattering effect in the optical fiber, the temperature field of each point in the space where the optical fiber is located modulates the light intensity of the back Raman scattering in the fiber (the light intensity of the anti-Stokes back Raman scattering), after demodulation the temperature The information is displayed in real time. The optical fiber Raman temperature sensor has the advantages o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 董凤忠孙苗汤玉泉李俊杨爽
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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