The experimental design of an optimal gas pressure sensor, based on the Fabry-Perot optical fiber with regard to the effect of thickness on sensor sensitivity

Document Type : Original Article

Authors

1 Master Student, Department of Photonics, Faculty of Basic Sciences, Imam Hossein University, Tehran, Iran

2 Associate Professor, Center for Laser Science and Technology and Optics, Imam Hossein University, Tehran, Iran

3 PhD Student, Laser and Optics Science and Technology Center, Imam Hossein University, Tehran, Iran

4 Navy Force of Sepah-Tehran-Iran

Abstract

In this paper, the performance of a high sensitivity, low cost, small size Fabri-Perot based, fiber-optic sensor for measuring the argon gas pressure is reported. A Fabri-Perot sensor probe with an air cavity, a length of 1.25 mm and suitable diaphragms with different thicknesses is considered. The ultimate goal is to achieve a diaphragm that detects and measures gas pressures below 60 millibars. A PVC layer is used as the second Fabri-Perot plate of the sensor,and the sensing experimental arrangement for measuring gas pressure is set up in the laboratory. The effect of gas pressure and also the diaphragm thickness as an important parameter on the sensitivity of the gas pressure sensor is investigated. The diaphragm thicknesses of 42, 56 and 70 μm and cavities with a length of 1.25 mm are investigated at different pressures of argon gas. The results show that the best sensitivity with a value of 0.035 nm / mbar is related to the sensor with a diaphragm thickness of 42 μm.

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