The utility model discloses a kind of
optical fiber LMR pressure sensors, comprising:
metal shell, its shell top is open, which is covered with
metal diaphragm, the bottom end surface center of
metal diaphragm is fixed with force transmission metal stick, the lower end of force transmission metal stick is deposited with
fluoride layer,
fluoride layer is deposited with
gallium-doped
zinc oxide film layer;Single-mode
optical fiber, it is located in metal shell, the cladding of single-mode
optical fiber removes middle section to
expose the
fiber core of middle section;Side surface opening microcapillary, it is cladded on the cladding of single-mode optical
fiber both ends, microcapillary is filled with matching liquid with same
refractive index and will be immersed with cladding, matching liquid can be as the liquid cladding of bare core;
Gallium-doped
zinc oxide film layer is located above liquid cladding, the space range between
gallium-doped
zinc oxide film layer and bare core is called
transition layer. The sensor can avoid the influence of stress transmission on optical
fiber, both have relatively wide sensing range, and also can ensure higher sensitivity.