Suppression of span in sealed microcavity Fabry–Perot pressure sensors

Shivam Mishra; Balasubramaniam Rajappa; Sudhir Chandra

doi:10.1117/1.OE.56.1.016105

6 January 2017 Suppression of span in sealed microcavity Fabry–Perot pressure sensors

Shivam Mishra, Balasubramaniam Rajappa, Sudhir Chandra

Author Affiliations +

Optical Engineering, Vol. 56, Issue 1, 016105 (January 2017). https://doi.org/10.1117/1.OE.56.1.016105

Abstract

Optical microelectromechanical system pressure sensors working on the principle of extrinsic Fabry–Perot (FP) interferometer are designed and fabricated for pressure range of 1-bar absolute. Anodic bonding of silicon with glass is performed under atmospheric pressure to form FP cavity. This process results in entrapment of gas in the sealed microcavity. The effect of trapped gas is investigated on sensor characteristics. A closed-loop solution is derived for the deflection of the diaphragm of a sealed microcavity pressure sensor. Phenomenon of “suppression of span” is brought out. The sensors are tested using white light interferometry technique. The residual pressure of the trapped gas is estimated from the experiments. The developed model has been used to estimate the deflection sensitivity of the free diaphragm and the extent of suppression of span after bonding.

Citation Download Citation

Shivam Mishra, Balasubramaniam Rajappa, and Sudhir Chandra "Suppression of span in sealed microcavity Fabry–Perot pressure sensors," Optical Engineering 56(1), 016105 (6 January 2017). https://doi.org/10.1117/1.OE.56.1.016105

Received: 18 September 2016; Accepted: 2 December 2016; Published: 6 January 2017

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