Supersensitive Hydrophone Based on Surface Plasmon Resonance
A surface plasmon and ultra-sensitivity technology, which is applied to instruments, utilizes wave/particle radiation, and measures ultrasonic/sonic/infrasonic waves. The use of wavelength detection equipment, cost reduction, and the effect of simple structure
Active Publication Date: 2017-01-18
CHINA JILIANG UNIV
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[0005] In order to overcome the problems of complex structure, high measurement cost, complex data processing, and low sensitivity of the vibration sensing head in optical fiber hydrophones, the present invention proposes a surface plasmon-based resonant ultra-sensitivity hydrophone
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[0014] The invention is further described below in conjunction with the accompanying drawings.
[0015] As shown in Figure 1, the super-sensitivity hydrophone based on surface plasmon resonance includes a laser light source 1, an optical isolator 2, a polarization controller 3, a 2×1 coupler 4, a single-mode transmission fiber 5, and side polishing Single-mode optical fiber 6, air gap 7, gold-plated "horn"-like SPR sensor 8, total reflection film 9, photodetector 10, data acquisition card (DAC) 11 and PC 12. The output end of the laser light source 1 is connected to the optical isolator 2, the output end of the optical isolator 2 is connected to the polarization controller 3, and one end of the two ports of the 2×1 coupler 4 is respectively connected to the output end of the polarization controller 3 and the photodetector Connect to the input end of the device 10, one port and one end of the 2×1 coupler 4 are connected to one end of the single-mode transmission fiber 5, and th...
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The invention relates to a surface plasmon resonance-based supersensitive hydrophone comprising a laser light source, an optical isolator, a polarization controller, a 2*1 coupler, a single-mode transmission fiber, a side-polished single-mode fiber, an air gap, a gold film-plated approximate horn-shaped surface plasmon resonance (SPR) sensor, a total reflection film, a photoelectric detector, a data acquisition card (DAC) and a PC computer. The air gap is formed by the side-polished single-mode fiber and the gold film-plated approximate horn-shaped SPR sensor; and the side-polished single-mode fiber, the air gap and the gold film-plated approximate horn-shaped SPR sensor form an optical fiber vibration sensing head. The external environment vibration vibrates to act on the gold film of the approximate horn-shaped SPR sensor, thereby causing the vibration of the gold film; the air gap changes, so that the SPR spectrum is changed; and the strength of the specific wavelength is detected, thereby realizing vibration measurement. The provided surface plasmon resonance-based supersensitive hydrophone has advantages of high practicability, low cost, high sensitivity, and good strength detection.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a super-sensitivity hydrophone based on surface plasmon resonance. Background technique [0002] Surface Plasmon Resonance (SPR) means that when the P-type polarized polychromatic light emitted by the light source passes through the interface between the thin film metal and the medium, if the incident angle is greater than the critical angle of total reflection, an electron concentration is formed on the surface. Due to the existence of the surface evanescent wave field and the complex refractive index of the metal, the light that satisfies the resonance wavelength is partially absorbed, and the light of the remaining wavelengths is reflected. In 1968, German physicists Otto and Kretschmann respectively used the (Attenuated Total Reflection, ATR) method to realize the excitation of surface plasmons in the optical frequency band in experiments. In 1993, Jorgenson et...
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IPC IPC(8): G01H9/00
Inventor 赵春柳王小明
Owner CHINA JILIANG UNIV