title: Optical pressure sensor based on the combined system of a variable liquid lens and a point diffraction interferometer.
abstract: 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.
authors.affiliation: Department of Optics, National Institute of Astrophysics, Optics and Electronics, Santa Maria Tonantzintla, Puebla 72000, Mexico. gaanmi@inaoep.mx
authors.forename: Anmi
authors.initials: A
authors.lastname: García
authors.forename: Manuel
authors.initials: M
authors.lastname: Gómez
authors.forename: Eva
authors.initials: E
authors.lastname: Acosta
mesh_terms: D004867:Equipment Design; D007368:Interferometry; D007909:Lenses; D055096:Optical Devices; D011312:Pressure; D014159:Transducers