Novel distributed optical fiber temperature and stress sensor

A distributed optical fiber and stress sensor technology, applied in the field of optical fiber sensing network, can solve the problem that the length of the sensing fiber is only tens to hundreds of meters.

Inactive Publication Date: 2013-06-19
李裔
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Although it can provide millimeter or even micron-level spatial resolution, it is limited by th

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  • Novel distributed optical fiber temperature and stress sensor
  • Novel distributed optical fiber temperature and stress sensor
  • Novel distributed optical fiber temperature and stress sensor

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Embodiment Construction

[0012] The present invention is about a new type of distributed optical fiber temperature and stress sensor. The specific implementations related to this sensor will be discussed in the following sections, but it should be understood that this patent is not limited to these specific implementations related to the present invention. Program. On the contrary, the present invention is intended to include all alternatives, modifications and equivalent embodiments, and these embodiments should be included in the characteristics and scope of the invention stated in the claims. according to image 3 As shown, a novel distributed optical fiber temperature and stress sensor invented describes a distributed temperature and stress measurement device based on optical fiber Rayleigh scattering, which includes a wavelength scanning laser (11), a pulse modulator (12), a doped An erbium fiber amplifier (13), a fiber optic circulator (14), a single-mode sensing fiber (15), a photodetector (16...

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Abstract

The invention discloses a novel distributed temperature and stress measuring optical fiber sensor, and relates to a distributed optical fiber temperature and stress sensor implemented by the aid of a Rayleigh scattering spectrum in an optical fiber and the optical time domain reflection principle. The Rayleigh scattering strength of each point of the optical fiber can be obtained by measuring backward Rayleigh scattering of pulsed light according to the optical time domain reflection principle, an event occurrence position can be positioned, and the Rayleigh scattering spectrum of each point of the optical fiber can be obtained by continuously changing the output wavelength of a laser. When the temperature or the stress of a certain position of the optical fiber is changed, the backward Rayleigh scattering spectrum of the optical fiber at the position can integrally, linearly and horizontally move, the variable quantity of the temperature and the stress can be obtained by comparing the backward Rayleigh scattering spectrum with the scattering spectrum before the temperature or the stress is changed, and the distributed temperature and stress can be measured. As the Rayleigh scattering strength is much higher than the Raman scattering strength and the Brillouin scattering strength, and the measuring method of the sensor is higher in signal-to-noise ratio and measuring accuracy as compared with that of spontaneous Raman and Brillouin scattering distributed sensors.

Description

technical field [0001] The invention relates to a new principle and device of an optical fiber sensor for distributed temperature and strain measurement, and belongs to the technical field of optical fiber sensor networks. Background technique [0002] The phenomenon of light scattering plays an important role in distributed optical fiber sensing technology. The principle of optical time domain reflection is to determine the position of an event in the optical fiber based on the backscattering of light pulses. According to the theory of light scattering, when light is transmitted in an optical fiber, there are mainly three kinds of scattering, namely Rayleigh scattering, Raman scattering and Brillouin scattering. Rayleigh scattering is linear scattering, that is, the wavelength of Rayleigh scattering light is consistent with the wavelength of excitation light; while Raman and Brillouin scattering are both nonlinear scattering, which are formed by optical and acoustic phonon ...

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Application Information

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IPC IPC(8): G01D21/02
Inventor 李裔张震伟
Owner 李裔
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