The design and fabrication of a miniature fiber Fabry-Perot pressure sensor with a diameter of 125 µm are presented. The essential element in the process is a thin SiO2 diaphragm that is fusion spliced at the hollow end of an optical fiber. Good repeatability and high sensitivity of the sensor are achieved by on-line tuning of the diaphragm thickness during the sensor fabrication process. Various sensor prototypes were fabricated, demonstrating pressure ranges of from 0 to 40 kPa to 0 to 1 MPa. The maximum achieved sensitivity was 1.1 rad/40 kPa at 1550 nm, and a pressure resolution of 300 Pa was demonstrated in practice. The presented design and fabrication technique offers a means of simple and low-cost disposable pressure sensor production.
© 2005 Optical Society of America
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
Denis Donlagic and Edvard Cibula, "All-fiber high-sensitivity pressure sensor with SiO2 diaphragm," Opt. Lett. 30, 2071-2073 (2005)