High-stability F-P optical fiber acoustic sensor

A F-P and sensor technology, applied in the coupling of instruments and optical waveguides, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of sensor instability and changes, improve anti-interference ability, widen line width, and reduce polarization degree of effect

Inactive Publication Date: 2010-10-27
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

But at the same time, since the amount of optical feedback without an isolator is easy to change with the influence of external interference factors, and a slight change in optical feedback may cause a huge change in the state of the laser, including frequency and phase, resulting in sensor instability

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Embodiment Construction

[0031] see first figure 1 , figure 1It is a structural schematic diagram of a high-stable F-P fiber optic acoustic sensor of the present invention, and is also a structural schematic diagram of an embodiment of the present invention. As can be seen from the figure, the high-stable F-P optical fiber acoustic sensor of the present invention includes a distributed feedback single-mode semiconductor laser 1 with pigtail output and a transmission Sensing head 8, the distributed feedback single-mode semiconductor laser 1 is connected to the input end of the polarization control device 2, and the output end of the polarization control device 2 is connected to the PC head 301 of the active connector 3 of the PC-APC, and the PC-APC is active The APC head 302 of the connector 3 is connected to the input end of the optical isolator 4, and the output port of the optical isolator 4 is connected to the input end of the optical depolarizer 5, and the output end of the optical depolarizer 5 i...

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Abstract

The invention relates to a high-stability F-P optical fiber acoustic sensor which comprises a distributed feedback single-mode semiconductor laser and a sensing head, wherein the distributed feedback single-mode semiconductor laser is provided with tail fiber output. The high-stability F-P optical fiber acoustic sensor is characterized in that the distributed feedback single-mode semiconductor laser is connected with a polarization control device, the polarization control device is connected with the PC (Physical Contact) head of a PC-APC (Physical Contact-Angled Physical Contact) movable connecting head, the APC head of the PC-APC movable connecting head is connected with an optical isolator, the optical isolator is connected with an optical depolarizer, the optical depolarizer is connected with the first port of a coupler through an optical fiber, the second port of the coupler is connected with the sensing head through a single-mode optical fiber, the third port of the coupler is connected with a signal processing and output unit through a photoelectric detector, and an antireflection film is plated on the fourth port of the coupler 6. The sensor has the characteristics of convenient regulation, high sensitivity and signal-to-noise ratio, strong anti-interference capability, good stability and the like.

Description

technical field [0001] The invention relates to optical fiber sensing, in particular to a highly stable F-P optical fiber acoustic sensor. Background technique [0002] Compared with capacitive sensors, optical fiber F-P sensors have the advantages of high sensitivity, anti-electromagnetic interference, safety and reliability, small size, corrosion resistance, and can form an optical fiber sensor network. Therefore, they are widely used in industrial flaw detection, material characteristic analysis, sound sensing, and transformer partial discharge. It has a good application prospect in the detection of liquid level and water pressure. But before this, there are some problems that limit its wide application. In the selection of the light source, the line width of the light source is required to be neither too narrow nor too wide, and it is required to be very stable; because the laser has a certain line width, it will inevitably generate frequency noise. , it is the main fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G02B6/42
Inventor 李健蔡海文耿健新陈迪俊
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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