The invention discloses a
surface plasmon resonance (SPR)
hydrogen sensor based on an Ag / PDMS / Pt-WO3 multilayer structure. The SPR
hydrogen sensor is characterized by comprising a
halogen lamp
light source, two sections of multimode optical fibers, a
spectrometer and an SPR
hydrogen sensing head, wherein the SPR hydrogen sensing head is composed of a different-core structure formed by multimode-single-mode-multimode optical fibers, a
silver film, PDMS (
polydimethylsiloxane) and Pt-WO3 (
platinum-
tungsten trioxide). The SPR
hydrogen sensor based on the Ag / PDMS / Pt-WO3 multi-layer structure, which is simple to prepare, high in sensitivity and capable of being repeatedly used for a long time, is provided aiming at the defects that an existing
optical fiber SPR
hydrogen sensor is low in sensitivity and complex in device manufacturing, and PdH is changed from an alpha phase to a
beta phase when Pd is used as a hydrogen sensitive material, so that the use of the device is influenced, and the like. When the
hydrogen concentration is increased, the Pt-WO3 reacts with the hydrogen to generate heat, so that the
refractive index of the PDMS film is changed, the SPR
resonance spectrum is moved, and the
hydrogen concentration is obtained by observing the offset of the PDMS film. The high
refractive index sensitivity of SPR is brought into full play by utilizing the high
refractive index change of PDMS, so that high-precision detection of hydrogen leakage is realized.