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Temperature measurement device and method based on single-passband microwave photon filter

A technology of microwave photon and temperature measurement, which is applied in the direction of measuring devices, thermometers with physical/chemical changes, thermometers, etc., can solve the problems of high cost, high performance requirements of optical filters, complex structure, etc., and reduce cost and complexity , suitable for long-distance measurement, low loss effect

Inactive Publication Date: 2015-04-29
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods either have higher requirements on the performance of the optical filter, and the cost is higher; or require more optical filters, the cost is high and the structure is complicated, and it is difficult to be practical

Method used

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  • Temperature measurement device and method based on single-passband microwave photon filter
  • Temperature measurement device and method based on single-passband microwave photon filter

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Embodiment 1

[0024] see figure 1 , the invention discloses a temperature measurement device based on a single-passband microwave photon filter, which includes a broadband light source 1, a Mach-Zehnder fiber interferometer 2, an electro-optic modulator 3, a microwave signal source 4, an optical fiber amplifier 5, a dispersion Optical fiber 6, photodetector 7 and electric power meter 8, wherein:

[0025] refer to figure 1 As shown, the input port of the Mach-Zehnder fiber interferometer 2 is connected to the broadband light source 1, the input port of the electro-optic modulator 3 is connected to the output port of the Mach-Zehnder fiber interferometer 2, and its output port is connected to the input port of the fiber amplifier 5 Connected, its electric drive port is connected with the microwave signal source 4, one end of the dispersion fiber 6 is connected with the output port of the optical fiber amplifier 5, the other end is connected with the input port of the photodetector 7, and the...

Embodiment 2

[0030] Cooperate figure 1 and figure 2 As shown, the present invention discloses a temperature measurement method based on a single-pass band microwave photon filter. The method adopts the temperature measurement device based on a single-pass band microwave photon filter in Embodiment 1, and is specifically implemented through the following steps:

[0031] S1, spectrum segmentation

[0032] Turn on the broadband light source 1, and the Mach-Zehnder fiber optic interferometer 2 performs spectrum segmentation on the light emitted by the broadband light source 1 to form a comb filter spectrum. At this time, the measured temperature signal acts on the sensing fiber of the Mach-Zehnder fiber optic interferometer 2 23 on.

[0033] S2, signal modulation and amplification

[0034] The comb filter spectrum is modulated by the microwave signal sent by the microwave signal source 4 through the electro-optical modulator 3 to obtain the modulated signal, and the modulated signal is amp...

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Abstract

The invention discloses a temperature measurement device based on a single-passband microwave photon filter. According to the temperature measurement device, the structure of combining spectrum segmentation of a Mach-Zehnder optical fiber interferometer and a chromatic dispersion optical fiber is adopted, and the single-passband microwave photon filter is achieved. One arm of the Mach-Zehnder optical fiber interferometer is connected with a sensing optical fiber, and the other arm of the Mach-Zehnder optical fiber interferometer is connected with a reference optical fiber. The optical path difference of the two arms of the Mach-Zehnder optical fiber interferometer is changed by temperature signals acting on the sensing optical fiber, and then the passband central frequency of the single-passband microwave photon filter is changed. Modulation microwave signal frequency is scanned, and the measured temperature is measured by obtaining the passband center frequency by measuring the recovery electric signal power through a photoelectric detector. The invention further discloses a temperature measurement method based on the single-passband microwave photon filter. By means of the temperature measurement device and device, remote temperature measurement preventive to electromagnetic interference can be achieved, and the cost and complexity of temperature measurement are greatly lowered.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to a temperature measurement device and method based on a single-pass band microwave photon filter. Background technique [0002] Optical fiber sensors are widely used in the field of long-distance measurement of temperature, stress and refractive index due to their advantages such as small size, light weight, easy realization of long-distance and distributed measurement, explosion-proof, electrical insulation and anti-electromagnetic interference. [0003] Most of the fiber optic temperature sensors adopt the structure of Mach-Zehnder fiber optic interferometer, which measures the temperature change by measuring the change of wavelength in the interference spectrum. The traditional optical fiber sensing wavelength demodulation methods often use optical filters, such as tunable F-P filter method and matched grating method. These methods either have higher requiremen...

Claims

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Application Information

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IPC IPC(8): G01K11/32
Inventor 付宏燕陈浩张诗纬许惠英蔡志平洪少华
Owner XIAMEN UNIV
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