All-fused-silica miniature optical fiber tip pressure sensor

Abstract

An all-fused-silica pressure sensor fabricated directly onto a fiber tip of 125 microm diameter is described. Simple fabrication steps include only cleaving and fusion splicing. Because no chemical processes are involved, the fabrication is easy, safe, and cost effective. Issues in sensor design and loss analysis are discussed. The sensor has been tested for static pressure response, showing a sensitivity of 2.2 nm/psi, a resolution of 0.01 psi (68.9 Pa), a hysteresis of 0.025%, and capability of operation at temperatures up to 600 deegrees C. This miniature sensor may be suitable for medical diagnostics, environmental monitoring, and other industrial applications.

High-pressure and high-temperature characteristics of a Fabry–Perot interferometer based on photonic crystal fiber

“…. These advantages make them very suitable for deployment in space-limited harsh environments such as turbine engines and power plants and in the oil and gas industry, where pressure and temperature are the two most common measurands [3][4][5][6][7]. Many methods have been developed to fabricate fiberoptic FPIs.…”

“…Many methods have been developed to fabricate fiberoptic FPIs. These include using conventional hollow-core fiber [3][4][5], chemical etching [7,8], and laser micromachining [9,10]. Recently, FPIs made from hollow-core photonic bandgap fiber [11] and solid-core photonic crystal fiber (PCF) [12] by simply cleaving and splicing have been demonstrated as strain and temperature sensors.…”

Low-Cost Fiber-Tip Fabry-Perot Interferometer and Its Application for Transverse Load Sensing

“…As one kind of optical fiber sensors [1][2][3][4][5], fiber optic Fabry-Perot interferometers (FPIs), which offer the advantages of high resolution, compact structure and immunity to electromagnetic interference, play important roles in a large number of sensing applications such as refractive index [6][7][8][9], strain [10][11][12], temperature [13][14][15], pressure [16][17][18] and so on. Among them, the Fabry-Perot cavity which is fabricated at the fiber tip can be effectively used in space limited environment.…”

“…Among them, the Fabry-Perot cavity which is fabricated at the fiber tip can be effectively used in space limited environment. A sealed fiber tip Fabry-Perot cavity can be fabricated by various techniques, such as sealing an etched multimode fiber [17,18] (or hollow core fiber [16]) by silica diaphragm, splicing a silica capillary [19] (or photonic crystal fiber [20]) to a single mode fiber and then melting it to get a micro-cavity. The sensors based on the above-mentioned techniques require two or more components or materials, which may suffer thermal instability caused by the different thermal expansion coefficients and a relatively high cost at the same time.…”

Compressible fiber optic micro-Fabry-Pérot cavity with ultra-high pressure sensitivity

“…A pressure sensor based on micro FP cavity commonly uses an elastic diaphragm at the fiber tip such as SiO 2 /silica, polymer, silver and graphene film [12][13][14][15][16][17][18][19][20]. The pressure sensitivity of the diaphragm-based fiber tip FP sensor is defined as the ratio of the FP cavity length variation to the pressure change, which critically depends on the size and the mechanical quality of the diaphragm employed.…”