Optical fiber sensor based on splitting-ratio-adjustable Mach-Zehnder interferometer
An optical fiber sensor and interferometer technology, which is applied in the measurement of phase influence characteristics, etc., can solve the problems of practical application limitation, high price, and high sensor cost.
Pending Publication Date: 2019-05-24
SOUTH CHINA NORMAL UNIVERSITY
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Problems solved by technology
Due to the high price of wavelength detection equipment such as spectrometers, the cost of this type of sensor is relatively high, and its practical application is limited
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[0031] The specific implementation of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the implementation and protection scope of the present invention are not limited thereto, and equivalent replacements that are substantially the same as the present invention all belong to the protection scope of the present invention.
[0032] A fiber optic sensor based on an adjustable Mach-Zehnder interferometer, such asfigure 1 shown, including:
[0033] Incident optical fiber 1, which is used to input optical signals;
[0034] Beam splitter 22, as a kind of preferred technical scheme, described beam splitter is bare multimode fiber core (MMFC) and is coated with graphene oxide coating 21, and the diameter of multimode fiber core is about 80 μ m , with a length of about 2mm, which is connected with the incident fiber and the modulation arm, so that the optical signal coming in from the incident fiber is coupled into the Ma...
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The invention discloses an optical fiber sensor based on a splitting-ratio-adjustable Mach-Zehnder interferometer. The optical fiber sensor comprises incoming optical fibers, a beam splitter, a modulation arm, a beam combiner and outgoing optical fibers and is characterized in that the incoming optical fibers are used for inputting optical signals, the beam splitter allows the optical signals entering from the incoming optical fibers to be coupled into the modulation arm, and the modulation arm is used for forming transmission waveguide to screen different optical wave transmission modes; thebeam combiner allows the optical signals entering from the modulation arm to be coupled into the outgoing optical fibers; the outgoing optical fibers are used for outputting the optical signals and transmitting the optical signals into detecting equipment. The optical fiber sensor has the advantages that multi-mode optical fibers forming the beam splitter / beam combiner are subjected cladding removing, the surfaces of the processed multi-mode optical fibers are coated with graphene oxide films, and splitting ratio modulation of the beam splitter / beam combiner is achieved by utilizing the interaction of the multi-mode optical fiber cores and ambient environments so as to achieve sensing.
Description
technical field [0001] The invention belongs to the field of optical fiber sensors, in particular to an optical fiber sensor based on a Mach-Zehnder interferometer. Background technique [0002] Humidity detection technology plays an extremely important role in the fields of food processing, instrument manufacturing, construction and structural health monitoring. Electric parameter sensors (such as resistive or capacitive sensors) currently on the market occupy a dominant position due to their advantages such as high measurement accuracy and fast response speed. However, in the environment of flammable, explosive and strong electromagnetic interference, electrical parameter sensors have insurmountable shortcomings such as inherent insecurity and poor stability, so it is of great research significance to seek intrinsically safe and stable sensors. Fiber optic sensor is a kind of optical sensor. Compared with traditional electrical sensors, fiber optic sensor has the advantag...
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Inventor 蒙红云邓淑营王显军谭春华黄旭光
Owner SOUTH CHINA NORMAL UNIVERSITY