Single-mode heterogeneous optical fiber cascaded strain array sensor
An array sensor and strain sensor technology, applied in the field of optical fiber, can solve the problems of high light reflectivity, low transmittance, and limited number of sensors, and achieve the effects of high beam transmittance, large number of multiplexed sensors, and low loss
Active Publication Date: 2019-05-31
GUILIN UNIV OF ELECTRONIC TECH
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[0006] However, in the above-mentioned interferometer structure based on space division multiplexing, the reflectivity and low transmittance of light between sensors in the strain array sensor are high, so that the number of sensors that can be connected in series in the strain array sensor is limited, and it is extremely large. reduces the sensor multiplexing capability of the system
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[0050] Example: see Figure 12 , the figure is an application based on the present invention—a Fizeau interferometer array composed of double-clad optical fibers. The strain array sensor is added to an interferometer to demodulate the white light interference signal. In the figure, a wide-spectrum light source 3, a signal processing unit 4, an optical fiber circulator 5, an optical fiber optical path difference scanner 6, and the structure of the optical path difference scanner 6 can be Michlson interferometer, MZ interferometer, Fizeau interferometer and Sagnac interferometer The optical path difference scanner composed of Etc. demodulates the white light interference signal returned from the strain array sensor cascaded with single-mode heterogeneous optical fibers.
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Abstract
The invention discloses a single-mode heterogeneous optical fiber cascaded strain array sensor, and the strain array sensor is mainly characterized in that the strain array sensor is a strain array sensor which is formed by integrating a heterostructure reflecting surface formed by a single-mode optical fiber 1 and a double-cladding optical fiber 2 on an optical fiber. The strain array sensor provided by the invention can be used for measuring factors such as ambient temperature and stress of the optical fiber strain array sensor, and is particularly applicable under a high-temperature condition due to the inherent characteristics of the strain array sensor provided by the invention. In addition, the sensor is high in sensitivity, is compact in structure, is high in temperature resistance,is low in cost, is large in sensor reuse number and the like.
Description
(1) Technical field [0001] The invention belongs to the field of optical fiber technology, and in particular relates to a strain array sensor with cascaded single-mode heterogeneous optical fibers. (2) Background technology [0002] In recent years, white light interferometric sensing technology has developed vigorously. One of the hot spots is the development of optical fiber sensors and test systems with multiple sensor multiplexing technologies for the measurement of physical quantities such as strain, temperature, and pressure. The background of the development of sensor multiplexing technology is mainly due to the fact that in actual measurement and testing applications, the sensing of a single physical quantity and a single location point is far from meeting people's requirements for the perception of the whole thing or system state, which often requires multiple or The distribution of multi-point physical quantities is measured online or in real time. For example, in...
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IPC IPC(8): G01K11/32G01L1/24G01K11/3206
Inventor 苑立波李文超
Owner GUILIN UNIV OF ELECTRONIC TECH
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