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High-sensitivity seawater salt temperature two-parameter sensor based on interference vernier effect

A vernier effect, seawater salt technology, applied in the direction of converting sensor output, using optical devices to transmit sensing components, instruments, etc., can solve the problems of poor stability, salinity temperature cross-sensitivity, low sensitivity, etc., to achieve good stability and low cost The effect of low and high sensitivity

Pending Publication Date: 2021-05-11
CHINA JILIANG UNIV
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Problems solved by technology

[0005] Aiming at the ubiquitous problems of low sensitivity, cross-sensitivity of salinity and temperature, and poor stability of optical fiber salinity and temperature sensors, the present invention proposes a high-sensitivity seawater salt sensor based on interference vernier effect with simple structure, low cost and strong practicability. Temperature dual parameter sensor

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  • High-sensitivity seawater salt temperature two-parameter sensor based on interference vernier effect
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  • High-sensitivity seawater salt temperature two-parameter sensor based on interference vernier effect

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Embodiment Construction

[0067] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0068] Such as figure 1 As shown, the high-sensitivity seawater-salt-temperature dual-parameter sensor based on the interferometric vernier effect includes a broadband light source 1, a 2×2 fiber optic coupler 2, a single-mode fiber 3, an optical fiber microbubble structure 4, a water injection port 5, and a water outlet 6. Large mode field optical fiber 7, single mode optical fiber 8, optical fiber microsphere structure 9, water injection port 10, water outlet 11, large mode field optical fiber 12, spectrometer 13. Among them, the broadband light source 1 and the spectrometer 13 are respectively connected to the two ends on the left side of the 2×2 fiber coupler 2, the one end on the right side of the 2×2 fiber coupler 2 is connected to the single-mode fiber 3, and one end of the fiber microbubble structure 4 is connected to the The...

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Abstract

The invention relates to a high-sensitivity seawater salt temperature two-parameter sensor based on an interference vernier effect. The high-sensitivity seawater salt temperature two-parameter sensor is characterized by comprising a broadband light source, a 2*2 optical fiber coupler, two double-FP-cavity Fabry-Perot interferometers arranged in parallel and a spectrograph, wherein the double-FP-cavity Fabry-Perot interferometer comprises a single-mode optical fiber, an optical fiber microsphere structure with a microfluidic channel and a large-mode-field optical fiber which are arranged in sequence. According to the invention, free spectral ranges of an air cavity and a quartz cavity in the interferometer are close to each other by setting optical fiber microsphere structures with different parameters and large-mode-field optical fiber cavity lengths, a vernier effect is realized, and corresponding frequencies of output spectrums are kept at intervals; when the seawater salt temperature changes, the cavity length of the interferometer changes, Fourier transform and filtering are carried out on output spectrums, and the output spectrums and envelopes of all the interferometers are obtained; the simultaneous measurement of two parameters can be realized through the envelope signal drift distance in combination with the salinity and temperature sensitivity matrix; and the high-sensitivity seawater salt temperature two-parameter sensor has the advantages of high practicability, compact structure, high sensitivity, high stability, capability of simultaneously measuring multiple parameters and the like.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and in particular relates to a highly sensitive seawater salt temperature dual-parameter sensor based on the interference vernier effect. The sensor has the advantages of simple structure, high sensitivity, good repeatability, and real-time and on-site accurate detection. Background technique [0002] The vernier effect uses the principle that the alignment scale of the main scale and the vernier will change in a large range when the small measurement value changes, so as to realize the enlarged reading of a small amount and improve the measurement accuracy. The vernier effect is widely used in the field of measurement. Combining the vernier effect with the fiber optic Fabry-Perot interferometer, through the cascade connection of two FP interference cavities, the superposition of the output spectral signals will form a new fringe envelope signal, and the fringe envelope can be demodulated to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353G01D21/02
CPCG01D5/35312G01D21/02
Inventor 赵春柳赵郝鑫徐贲石岩王海龙龚华平毛邦宁康娟沈常宇王东宁
Owner CHINA JILIANG UNIV
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