Method for manufacturing refractive index sensor and refractive index sensing device
A technology of a refractive index sensor and a manufacturing method, which is applied in the direction of phase influence characteristic measurement, etc., can solve problems such as large volume and difficulty in integration, and achieve the effect of improving sensitivity
Inactive Publication Date: 2010-10-27
CHINA JILIANG UNIV
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Problems solved by technology
Early surface plasmon resonance sensors were based on prism structures, which were bulky and difficult to integrate
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[0016] Such as figure 1 As shown, a tilted fiber grating 1 is carved on the optical fiber, and its tilt angle is 4°-10°. Then a layer of gold film 2 is plated on the inclined grating by ion sputtering method, the thickness of the gold film is between 20nm and 50nm, thus the refractive index sensor is formed.
[0017] Such as figure 2 As shown, the light emitted by the broadband light source 3 with a bandwidth of 80nm-100nm enters the refractive index sensor 6 through the polarizer 4 and the polarization controller 5, and its transmission spectrum is input to the wavelength demodulator 7 for detection. The plasmon resonance wavelength and Bragg wavelength measured by the wavelength demodulator 7 are sent to the computer processing system 8 for processing, which can realize compensation for ambient temperature changes and provide the corresponding solution refractive index.
[0018] The method for determining the plasmon resonance wavelength and the method for compensating th...
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Abstract
The invention relates to a method for manufacturing a refractive index sensor and a refractive index sensing device. The conventional sensor has the disadvantages of low measuring accuracy and short life service. In the method for manufacturing the refractive index sensor, a gold film is plated on the circumferential surface of an inclined fiber bragg grating by utilizing an ion sputtering film coating method. The refractive index sensing device of the invention comprises a broadband light source, a polarizer, a polarizing controller, a refractive index sensor, a demodulator and a computer processing system. Light emitted by the broadband light source of which the bandwidth is between 80 and 100 nanometers enters the refractive index sensor through the polarizer and the polarizing controller, a transmission spectrum obtained by the refractive index sensing is inputted to the wavelength demodulator, and a plasma resonance wavelength and a bragg wavelength which are obtained by the wavelength demodulator are sent to the computer processing system. The refractive index sensor can improve the sensitivity of the refractive index sensing greatly, and simultaneously, can be used as a temperature reference signal to compensate the effect on environmental temperature variation during the measurement of refractive indexes in real time by utilizing the bragg wavelength of the inclined fiber bragg grating.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a refractive index sensor, in particular to a refractive index sensor based on surface plasmon resonance of an inclined optical fiber grating and a sensing device for measuring the refractive index using the sensor. Background technique [0002] It is the most direct and effective way to realize the sensing of various chemical quantities such as solution concentration, soil moisture, and various protein or antibody types and contents in biochemical sensing by measuring the refractive index, and it is also a research hotspot in related fields of various industries. [0003] Fiber Bragg grating-based refractive index sensors, including long-period gratings and Bragg gratings, are widely used in biological and chemical sensing. Due to the coupling mechanism of the cladding mode of the long-period fiber grating, the external refractive index change will directly affect th...
Claims
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Inventor 邵理阳董新永金尚忠
Owner CHINA JILIANG UNIV