Patent ID: 9074957
Filing Date: 2015-07-07
Classification: G01L,G02B

Abstract:
1. A high stable fiber fabry-perot pressure sensor with glue-free packing, comprising: (a) a sensor head with a fabry-perot cavity, being a 4-layer structure where a first layer is a silicon wafer for sensing a pressure and has a rear surface forming a first reflecting surface of said fabry-perot cavity, a second layer is a first Pyrex glass wafer shaped as a ring with a through hole, a third layer is a second silicon wafer forming a second reflecting surface of said fabry-perot cavity, and a fourth layer is a second Pyrex glass wafer having a through hole and a rear end face; (b) a sensor body of a cylinder or rectangular shape having a through hole and being made of Pyrex glass or K9 glass, said sensor body having a front end face spliced with said rear end face of said second Pyrex glass wafer; (c) a transmission optical fiber, having a front end face disposed into said through hole of said sensor body for transmitting incident light and emergent light, and said front end face of said transmission optical fiber is in contact with said rear end face of said second silicon wafer; and wherein said four layers of said sensor head bonded to each other by anodic bonding to form bonds which comprise no glue.