The invention discloses an
optical fiber cantilever beam temperature sensor based on
metal coating, which belongs to the technical field of
optical fiber sensors. The
optical fiber cantilever beam temperature sensor based on
metal coating comprises a
laser source, a
photodetector, an optical
fiber circulator, an optical
fiber, a fixed supporting end, an optical
fiber cantilever beam, a
metal film,a fabry-perot cavity and an optical fiber end surface, wherein the optical fiber cantilever beam is located on the optical fiber end surface and is connected with the optical fiber end surface through the fixed supporting end at the edge of the optical fiber end surface; the optical fiber cantilever beam is parallel with the optical fiber end surface to form the fabry-perot cavity, and an opticalfiber integration structure is formed; the outer surface of the optical fiber cantilever beam is coated with the metal film, and a two-
film structure is formed; the
laser source is connected with theport A of the optical fiber
circulator; the optical fiber cantilever beam integration structure is connected with the port B of the optical fiber
circulator; and the
photodetector is connected with the port C of the optical fiber circulator. The metal film is expanded and contracted under temperature influences and two-film
thermal deflection effects are generated with the optical fiber cantilever beam, the optical fiber cantilever beam generates
thermal deflection, the length of the fabry-perot cavity is caused to change, light signals emitted by the
laser source are reflected in the fabry-perot cavity, and under fabry-perot cavity length modulation, the reflected light signals are detected, and thus, the temperature can be detected.