▎ 摘　　要

NOVELTY - The detector has a sensing head (3) provided with a metal electrode. An end of a quartz tube is welded to an end of a single-mode optical fiber. An optical fiber micro-graphene film is covered on another end of the quartz tube. Two ends of a solar panel (4) are respectively connected to positive and negative poles of the metal electrode of the sensing head. A distributed feedback (DFB) laser (1) emits optical signal entering into the head after passing through an optical fiber coupler (2). The head reflects the optical signal entering into a photoelectric detector (5) by the coupler. USE - Graphene-based thin film optical fiber micro-cavity illumination intensity detector. ADVANTAGE - The detector reduces optical power of the probe. The detector uses the solar panel to receive light source radiated energy to be converted into electric energy that generates Joule heat in the form of current by the graphene film, so that the graphene film contracts under the effect of Joule heat caused by changing of length of the optical fiber micro-cavity and the output voltage of the photoelectric detector is changed. The detection system effectively measures light intensity of the light source with the large area light emitting object to ensure strong small spot laser light intensity measurement directivity while effectively increasing light intensity measurement sensitivity. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of the graphene-based thin film optical fiber micro-cavity illumination intensity detector. (Drawing includes non-English language text) DFB laser (1) Optical fiber coupler (2) Sensing head (3) Solar panel (4) Photoelectric detector (5)