Photoelectronic device for distributed optical fiber temperature sensor
A temperature sensor, distributed optical fiber technology, applied in the direction of thermometers, measuring devices, coupling of optical waveguides, etc., can solve the problem of insufficient isolation, weakening of anti-Stokes light and Stokes light intensity, temperature curve distortion, etc. problem, to achieve the effect of improving the temperature resolution
Inactive Publication Date: 2012-06-27
KINGSHORE NEW RESOURCES ELECTRIC JIANGSU
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Problems solved by technology
First of all, this wavelength division multiplexing device uses a 1X3 bidirectional coupler, which will introduce an additional loss of about 9.5dB (10log(1 / 9)=9.5dB), which greatly weakens the available anti-Stokes light and Stokes light intensity; Secondly, the isolation of the device is difficult to exceed 40dB, the reason is the same as above
[0007] If the above-mentioned conventional wavelength division multiplexing device is used in a distributed optical fiber temperature sensor, due to insufficient isolation, it will cause mutual crosstalk between anti-Stokes light and Stokes light, and interference of Rayleigh scattered light. It is difficult to obtain accurate temperature information and high resolution. In severe cases, the temperature curve may even be distorted and the system may not work properly.
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[0032]The optoelectronic device used for the distributed optical fiber temperature sensor of the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, which does not limit the protection scope of the present invention.
[0033] like figure 1 As shown, the optoelectronic device used for the distributed optical fiber temperature sensor in this embodiment consists of collimator pigtails 101 and 102, collimators 103 and 104, a wavelength division multiplexing filter 105 for laser wavelength, and a Stokes wavelength Bandpass filters 106, 107, multiplexing filter 108 for anti-Stokes wavelengths, bandpass filter 109 for anti-Stokes wavelengths, self-focusing lenses 110, 111, avalanche photodiodes (APD) 112, 115 , APD reverse voltage input 113, 116, anti-Stokes electrical signal output 114, Stokes electrical signal output 117, temperature probes 118, 119, device housing 120 and other components. Its basic st...
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The invention relates to a photoelectronic device for a distributed optical fiber temperature sensor, which belongs to the technical field of optical fiber sensing. The device comprises a first collimator tail optical fiber and a second collimator tail optical fiber. Wavelength division multiplexing filters are arranged on transmission light paths of a first collimator and a second collimator respectively. Band pass filters are arranged on light paths of the two wavelength division multiplexing filters respectively. A first self-focusing lens and a second self-focusing lens are arranged on the transmission light paths of the two band pass filters. A first avalanche photodiode, a second avalanche photodiode and temperature probes are arranged at the focuses of the two self-focusing lenses respectively. The distributed optical fiber temperature sensor utilizing the photoelectronic device can conveniently acquire accurate temperature information, and improves the temperature resolution of a system.
Description
technical field [0001] The invention relates to an optoelectronic device, in particular to an optoelectronic device used for a distributed optical fiber temperature sensor, and belongs to the technical field of optical fiber sensing. Background technique [0002] Since the first successful realization of the distributed temperature measurement technology based on Raman scattering by J.P. Dakin et al. in 1985, people have carried out extensive research on various technologies for realizing distributed optical fiber temperature sensing. Sensor technology has been the most widely used in practice. Compared with traditional sensors, distributed optical fiber temperature sensors have many excellent advantages: using optical fiber itself as the sensing medium, thousands of points of temperature information distributed along the optical fiber can be obtained in one measurement, which realizes continuous distributed measurement and reduces the energy consumption. Measurement uncert...
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IPC IPC(8): G01K11/32G02B6/42G01K11/324
Inventor 周金龙朱冬宏田群
Owner KINGSHORE NEW RESOURCES ELECTRIC JIANGSU