Method for detecting temperature and magnetic field simultaneously based on magnetofluid-filled crystal fiber loop mirror
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A technology of crystal fiber and photonic crystal fiber, which is applied in the field of micro-optoelectronic detection, can solve problems such as the difficulty of making special fiber gratings and the difficulty of light wave demodulation, improve stability and measurement sensitivity, overcome large coupling losses, reduce effect of size
Inactive Publication Date: 2014-03-05
SHENYANG INST OF ENG
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However, this method uses a special fiber grating, which is very difficult to manufacture, and it is very difficult to demodulate light waves.
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[0021] The present invention will be described in further detail below in conjunction with the embodiments shown in the accompanying drawings.
[0022]This method is to selectively fill the air hole of a common photonic crystal fiber with symmetrical structure with magnetic fluid (select the center row in the horizontal direction). Since the refractive index of the magnetic fluid has a magnetic field and temperature dependence, the external magnetic field acting on the photonic crystal fiber will Or when the temperature changes, the birefringence characteristics of the photonic crystal fiber will change accordingly, forming a temperature / magnetic field adjustable birefringence photonic crystal fiber. Using this fiber to replace the conventional birefringent fiber in the Sagnac loop mirror, the distance between two adjacent resonance valleys and the drift of the resonance valley all change with the temperature and magnetic field, and the change sensitivities are different. Accor...
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Abstract
The invention relates to a method for detecting micro photoelectrons, in particular to a method for detecting temperature and a magnetic field simultaneously based on a magnetofluid-filled crystal fiber loop mirror. According to the method, magnetofluid is selectively filled into air holes of a structurally-symmetrical photonic crystal fiber along the center line in the horizontal direction; the birefringence characteristic of the photonic crystal fiber is changed accordingly, and a temperature/magnetic field-adjustable birefringent photonic crystal fiber is formed; a traditional birefringent fiber in a Sagnac fiber loop mirror is replaced by the temperature/magnetic field-adjustable birefringent photonic crystal fiber, the distance between two adjacent resonance valleys and the drift distance of the resonance valleys are changed along with the changes of the temperature and the magnetic field with different change sensibilities, and accordingly the temperature and the magnetic field can be simultaneously detected through the two-parameter matrix method. The method improves the stability performance and measuring sensitivity of a sensor, solves the problem of cross sensitivity of the temperature and the magnetic field of the optical fiber sensor and achieves the purpose of measuring the temperature and the magnetic filed simultaneously through one optical fiber.
Description
technical field [0001] The invention relates to a miniature optoelectronic detection method, in particular to a method for simultaneous detection of temperature and magnetic field under a crystal fiber ring mirror filled with magnetic fluid. Background technique [0002] Optical fiber sensors have high sensitivity, fast response, large dynamic range, strong anti-electromagnetic interference, ultra-high electrical insulation, flame-proof, explosion-proof, high safety performance, corrosion resistance, rich material resources, low cost, small size, dexterity and lightness, The advantage of being easy to use. Optical fiber sensors can realize a wide range of sensing physical quantities, and are widely used in the measurement of magnetism, sound, force, temperature, displacement, rotation, acceleration, liquid level, strain, light, voltage, current, image transmission, and certain chemical quantities. The application prospect is very broad. However, the optical fiber senso...
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