We propose an experimental efficient optical pressure sensor based on a variable liquid lens and a modified point diffraction interferometer. The working principle of the sensor is based on the fact that a variation in pressure induces a change in lens curvature and hence in its focal length, which can be tracked and measured with the interferometer. The pressure is then measured by recording and processing the interferometric images. The sensor in this proposal can change its dynamic range by the simple axial movement of one of the components of the optical system. In this work we show the performance of the system within three working ranges: from 0 to 1 kPa with accuracy of approximately 0.01 kPa, from 0 to 7 kPa with 0.05 kPa accuracy, and from 0 to 30 kPa with 0.3 kPa accuracy.
© 2012 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: September 7, 2011
Manuscript Accepted: October 19, 2011
Published: February 28, 2012
Anmi García, Manuel Gómez, and Eva Acosta, "Optical pressure sensor based on the combined system of a variable liquid lens and a point diffraction interferometer," Appl. Opt. 51, 905-911 (2012)