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Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof

A surface plasmon and optical fiber sensor technology, which is applied in the direction of converting sensor output, using optical devices to transmit sensing components, cladding optical fibers, etc., to achieve the effects of small detection sample size, good resistance to external interference, and small size

Active Publication Date: 2020-11-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the Mach-Zehnder interferometer has been applied in the field of sensing to a certain extent, but its detection sensitivity is not as high as that of the SPR sensor.

Method used

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  • Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof
  • Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof
  • Mach-Zehnder interference optical fiber based on surface plasma effect and sensor thereof

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Embodiment 1

[0049] In this embodiment, a Mach-Zehnder interference fiber based on the surface plasmon effect is provided, and its structure schematic diagram is shown in figure 1 , this embodiment provides an optical fiber sensor that generates different output spectra by detecting the concentration of different concentrations of the solution to detect the concentration of the solution.

[0050] Such as figure 2 As shown, a Mach-Zehnder interference optical fiber sensor based on the surface plasmon effect includes a first transmission optical fiber 101 connected in sequence, and a sensing area optical fiber 2. The sensing area optical fiber of this embodiment is a coreless optical fiber, and the second Transmission optical fiber 102, wherein, the first transmission optical fiber 101 and the second transmission optical fiber 102 are commercial multimode optical fibers, wherein the core diameter of the first transmission optical fiber 101 is 62.5 μm, the cladding diameter is 125 μm, and th...

Embodiment 2

[0068] This embodiment provides a Mach-Zehnder interference optical fiber based on the surface plasmon effect. This embodiment provides an optical fiber sensor that generates different output spectra by detecting different concentrations of solution concentrations to detect solution concentrations.

[0069] A Mach-Zehnder interference optical fiber sensor based on the surface plasmon effect in this embodiment includes a first transmission optical fiber 101 and a sensing area optical fiber 2 connected in sequence. The sensing area optical fiber in this embodiment is a coreless optical fiber. Two transmission optical fibers 102, wherein the first transmission optical fiber 101 and the second transmission optical fiber 102 are commercial multimode optical fibers, wherein the core diameter of the first transmission optical fiber 101 is 62.5 μm, the cladding diameter is 125 μm, and the length can be determined according to the experiment The distance of the equipment used in is dete...

Embodiment 3

[0086] This embodiment provides a Mach-Zehnder interference optical fiber based on the surface plasmon effect. This embodiment provides an optical fiber sensor that generates different output spectra by detecting a single gas with different concentrations to detect the concentration of a single gas.

[0087] A Mach-Zehnder interference optical fiber sensor based on the surface plasmon effect in this embodiment includes a first transmission optical fiber 101 and a sensing area optical fiber 2 connected in sequence. The sensing area optical fiber in this embodiment is a coreless optical fiber. Two transmission optical fibers 102, wherein the first transmission optical fiber 101 and the second transmission optical fiber 102 are commercial multimode optical fibers, wherein the core diameter of the first transmission optical fiber 101 is 62.5 μm, the cladding diameter is 125 μm, and the length can be determined according to the experiment The distance of the equipment used in is det...

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Abstract

The invention discloses a Mach-Zehnder interference optical fiber based on a surface plasma effect and a sensor thereof, which belong to the field of optical fiber sensors. According to the Mach-Zehnder interference optical fiber based on the surface plasma effect, a first layer of metal film is arranged on the periphery of a sensing area optical fiber, a polymer layer is arranged on the peripheryof the first layer of metal film, and a second layer of metal film is arranged on the periphery of the polymer layer; the thickness of the first layer of metal film is 20 to 200nm, the thickness of the polymer layer is 150 to 180nm, and the thickness of the second layer of metal film is 20 to 50nm. According to the optical fiber, a heavy metal film can generate surface plasma waves under the action of light waves, and two beams of plasma waves can be generated in a double-layer heavy metal film structure, so that Mach-Zehnder interference can be formed. Change of an external environment to bedetected can cause movement of an interference spectrum, and high-sensitivity detection is achieved according to the movement amount of the wavelength. The structure is simple, the refractive index sensitivity is high, and the sensor can work in any waveband.

Description

technical field [0001] The invention belongs to the field of optical fiber sensors, in particular to a surface plasmon effect-based Mach-Zehnder interference optical fiber and a sensor thereof. Background technique [0002] The optical fiber surface plasmon resonance (SPR) sensor has been widely used due to its high sensitivity. The free electrons oscillate, forming surface plasmon waves. However, at present, the working wavelength of the optical fiber sensor based on the principle of surface plasmon resonance is mainly concentrated in the visible light band, and there are certain limitations to the long wavelength and even the mid-infrared band. Therefore, further improving the sensitivity and broadening the working wavelength can better expand the sensor. scope of application. [0003] The Mach-Zehnder interferometer divides a beam of optical signal into two parts, one part enters the reference arm, and the other part enters the sensing arm, and after a certain distance,...

Claims

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Application Information

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IPC IPC(8): G01D5/353G01N21/31G01N21/552G01N21/45G02B6/02
CPCG01D5/35329G01N21/31G01N21/45G01N21/553G01N2021/451G01N2021/458G02B6/02052
Inventor 程同蕾周雪李曙光张学楠
Owner NORTHEASTERN UNIV
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