Abstract
In this article, a method for simultaneous vibration and pressure measurement using Optical Coherence Tomography (OCT) is presented. The method involves the design and use of a miniature optical sensor consisting of a thin diaphragm made from an optical adhesive attached to a microscale air-filled cavity. The sensor is calibrated by measuring the velocity of its diaphragm using known pressures. To demonstrate the simultaneous vibration and pressure measurement, the calibrated sensor is inserted into a small air-filled cavity with a flexible diaphragm, and the velocities of both the cavity diaphragm as well as the diaphragm of the sensor are measured simultaneously using OCT vibrometry. The velocity measured at the sensor diaphragm is used to determine pressure using its calibration chart. The method demonstrated here will be useful to study vibroacoustic wave propagation phenomena in open field as well as in microchannels such as the cochlea.
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