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

A high spatial resolution, temperature sensor technology, applied in 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: 2015-05-13
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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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. A sensor laser source adopts a low-energy picosecond-order light emitting module, a signal acquisition and processing module adopts a single-photon counting technology to calculate Stokes scattered light and anti-Stokes scattered light, a physical Raman scattering principle of quantum and mathematical probability statistics are combined and the single-photon counting technology and a gating technology are combined to achieve improvement of temperature monitoring space resolution. A single-mode optical fiber is used as a sensing optical fiber, has lower transmission loss compared with a multi-mode optical fiber and is suitable for long-distance temperature detection. A used detector is a single-photon detector, has the advantages of being low in dark counts, wide in response frequency spectrum, high in repeating speed and the like and is suitable for weak signal detection. A used time recording module is a time related single-photon counter and can measure related time of a single photon pulse at high accuracy, and 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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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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