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Light intensity modulation type signal demodulation system and signal demodulation method

A signal demodulation and modulation type technology, applied in the field of light intensity modulation type signal demodulation system and signal demodulation, can solve the problems of low precision, no temperature compensation function, expensive production equipment, etc., to achieve rapid response, overcome the Effects of simultaneous strain and temperature response, improved accuracy and sensitivity

Active Publication Date: 2016-07-06
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the first three types of fiber optic sensors require expensive manufacturing equipment, laser light sources, optical coupling devices, photoelectric conversion devices, etc., and the manufacturing process is relatively complicated.
Moreover, the existing polymer optical fiber strain sensor has low precision and does not have temperature compensation function due to temperature interference

Method used

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  • Light intensity modulation type signal demodulation system and signal demodulation method
  • Light intensity modulation type signal demodulation system and signal demodulation method
  • Light intensity modulation type signal demodulation system and signal demodulation method

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0028] see figure 1 , The light intensity modulation signal demodulation system disclosed in the present invention includes a function signal generator 1, a signal demodulator 2, an optical fiber coupler 3, a data acquisition module 5 and an oscilloscope 6.

[0029] The function signal generator 1, the signal demodulator 2 and the fiber coupler 3 are connected in sequence, the excitation source provided by the function signal generator 1 sends out light with a modulated signal through the signal demodulator 2, and then splits the light through the fiber coupler 3 There are two branches, the first branch is provided with a first optical fiber coupler 3-1, the first photodetector 4-1 and the sensing optical fiber 7-1 for providing optical strain information, and the second branch is provided wi...

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Abstract

The invention discloses a light intensity modulation type signal demodulation system and signal demodulation method, and belongs to the technical field of light intensity modulation. A high-performance function signal generator is applied to provide an excitation source to light modulation signals, the light modulation signals enter a sensing optical fiber and a reference arm optical fiber through an optical fiber coupler, and reflected light carries strain and temperature information to reach a photoelectric detector through a coupler. The signals are accessed to an oscilloscope through amplification and filtering processing so as to observe phase difference. The system is simple in structural arrangement, high in sensitivity, high in precision and rapid in reaction. The method can be used for various occasions requiring obtaining of real-time strain monitoring data.

Description

technical field [0001] The invention belongs to the technical field of light intensity modulation, and relates to a light intensity modulation signal demodulation system and a signal demodulation method, in particular to a light intensity modulation signal demodulation system and a signal demodulation system of a polymer optical fiber strain sensor with temperature compensation. demodulation method. Background technique [0002] With the gradual development of automation and intelligence in modern industry, space technology, military and other fields, the requirements for the sensitivity, precision and reliability of sensors are increasing. Good dynamic range, small size, corrosion resistance, fast response, networked, distributed, multi-point, large area, synchronous detection and other advantages, are favored by experts and users at home and abroad. Plastic polymer optical fiber has more advantages than glass optical fiber as a device for sensing signals: (a) polymer opti...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 罗冬马建勋
Owner XI AN JIAOTONG UNIV
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