Unbalanced polarization-maintaining optical fiber double interferometer temperature and strain simultaneous measurement device and method
A polarization-maintaining optical fiber and measurement device technology, which is applied in the direction of measurement devices, optical devices, thermometers, etc., can solve the problems of temperature and strain cross-sensitivity, temperature and strain cross-sensitivity of optical fiber interferometer sensors, etc.
Active Publication Date: 2019-12-10
HARBIN ENG UNIV
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Problems solved by technology
[0010] However, for the most widely used fiber optic interferometer sensors, the method of setting the reference fiber optic measurement system and the use of integrated fiber optic strain and temperature sensors are mainly used to solve the temperature and strain cross-sensitivity problems of fiber optic interferometer sensors, but these two methods The disadvantages are also obvious
Therefore, there is no simple, effective and universally applicable method to solve the problem of temperature and strain cross-sensitivity of fiber optic interferometer sensors in the existing patented technology
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[0054] The following examples describe the present invention in more detail.
[0055] Before testing for temperature and strain, the device needs to be properly connected. as attached figure 1 As shown in Figure 2, all parts of the devices are connected according to the connection method described in the summary of the invention. In order to make the optical path more stable, all optical path connections are welded.
[0056] Connection method:
[0057] (1) The narrow bandwidth laser light source 101 is connected to the input end a of the polarization maintaining circulator 141 through the polarizer 111, and the on-axis angle 121 of the polarization maintaining fiber at the connection is 0°~45°; the unbalanced polarization maintaining fiber interferometer 130 passes through The polarization beam splitting differential detection device 140 is connected to the signal acquisition, demodulation and recording device 150;
[0058] (2) The unbalanced polarization-maintaining fiber ...
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Abstract
The invention provides a device and method for simultaneously measuring temperature and strain of an unbalanced polarization-maintaining optical fiber double interferometer. Polarization-maintaining fiber coupler, phase modulator, polarization-maintaining fiber, and polarization-maintaining fiber mirror constitute an unbalanced polarization-maintaining fiber interferometer. Coaxial transmission signal interference, the interference signal is detected by a polarization beam splitting differential detection device composed of a polarization maintaining circulator, a polarization beam splitter and a photodetector, and finally processed by a signal acquisition, demodulation and recording device. Due to the different parameters of the fast and slow axis of the polarization maintaining fiber, the fast axis signal and the slow axis signal have different responses to the same temperature and strain. An orthogonal response matrix is constructed by using an unbalanced interferometer structure, and the temperature response coefficient of the two interference signals is measured. and strain response coefficient, which can realize simultaneous measurement of temperature and strain. This solution solves the problem of cross-sensitivity, and the measurement results are accurate and stable, and the sensitivity is high.
Description
technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an unbalanced polarization-maintaining optical fiber double interferometer temperature and strain simultaneous measurement device and method. Background technique [0002] With the rapid development of human society, various large-scale infrastructure facilities are constantly being constructed. In the structural safety guarantee of large-scale modern engineering structures, such as dams, skyscrapers and bridges, strain detection is an indispensable means. In many During the production, construction and maintenance of engineering structures, strain testing is required to ensure the quality of construction and operation. In addition, strain detection has very important applications in human activities such as seismic and crustal strain monitoring, oil well exploration, and marine environment detection, so various strain detection sensors emerge in endlessly. [0003] Compare...
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IPC IPC(8): G01K11/32G01B11/16
CPCG01B11/168G01K11/32
Inventor 杨军田帅飞陈文静吕岩张毅博李寒阳苑勇贵苑立波
Owner HARBIN ENG UNIV