High-sensitivity optical fiber surface plasmon air pressure detector
A technology of surface plasma and elemental air pressure, which is applied to the measurement of fluid pressure using optical methods, the measurement of fluid pressure through mechanical components, and the measurement of fluid pressure of elastic deformation gauges, etc., can solve the problem of high cost and achieve low cost of equipment , the effect of good application prospects
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Embodiment 1
[0020] The present invention provides a highly sensitive optical fiber surface plasmon pressure detector. like figure 1 As shown in this highly sensitive optical fiber surface plasmon sensor comprises a pressure tank 1, the elastic film 2, a first optical fiber 3, a second optical fiber 4, the noble metal portion 5, the opening 6. 1 is a surface tank five rectangular parallelepiped, elastic film 2 faces the sixth rectangular parallelepiped, and the elastic film 1 tank 2 surrounded by a closed chamber. Material tank 1 for fresh material. Preferably, the material tank 1 is made of stainless steel. 2 is a material of the elastic membrane of an elastic material. Preferably, the material is a rubber elastic film 2. In the present invention, the material of the elastic film 2 need not be a transparent elastic material. Under the effect of ambient gas pressure, the elastic film 2 like the closed chamber can be bent to. Sealed pressure chamber may be the same ambient air pressure, ambient...
Embodiment 2
[0026] On the basis of the embodiment 1, the distance between the end faces of the first and second optical fiber 3 4 less than 10 microns, greater than 2 microns, the noble metal portion 5 is a noble metal thin film, in order to excite surface plasma noble metal portion 5 polaritons, the surface of the noble metal and the like propagate along the film surface plasmon polariton. The thickness of the noble metal film is less than a second core of the first optical fiber 3 and the optical fiber 4 to be away from the surface of the elastic membrane 2, so that, from the first core and the noble metal thin film 3 and the second optical fiber near the optical fiber 4, in order to stronger excitation noble metal thin film on the surface plasmon polaritons, the light detector to facilitate detection. More preferably, in the middle of the gap, the elastic film 2 is provided with an elastic material, the elastic material is then provided on the noble metal thin film. As a result, the noble ...
Embodiment 3
[0028] On the basis of Example 1, if figure 2 , The noble metal is a noble metal portion 5 blocks. The thickness of the noble metal block is smaller than the first core of the optical fiber 3 and the optical fiber 4 to a second distance from the second surface of the elastic membrane. Noble metal block width, i.e. the dimension perpendicular to the first optical fiber 3 and the connection direction of the second fiber 4, less than 3 microns and the size of the core or equivalent. Block length of the noble metal, i.e. in the direction of the first dimension optical fiber connection 4 and the second optical fibers 3, of less than 1 micron, more preferably, the length of the noble metal block is less than 500 nanometers. Noble metal from the first block and the optical fiber 3 is less than 100 nanometers. The second optical fiber from the noble metal block 4 is less than 100 nanometers. Thus, the local near-field coupling is formed between the end faces of the three first optical fib...
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