Abstract
We present a novel hybrid miniature dual-cavity Fabry–Perot sensor for simultaneous pressure and
temperature measurements. The pressure sensing cavity is composed of an UV-molded cavity covered by a metal/polymer
composite diaphragm for achieving a high pressure sensitivity while maintaining a miniature sensor size. Another
intrinsic polymer/silica cavity is adopted for temperature sensing, which enables a high temperature sensitivity even
with a short cavity length due to the large thermal expansion of the polymer. The sensor is fabricated by using a
unique UV molding process with simple and safe procedures. The overall sensor size is around 150 μm in
diameter and 343 μm in length. Experimental studies show that the sensor exhibits a good linearity over a
pressure range of 6.89 to 27.58 kPa with a pressure sensitivity of 0.0122 μm/kPa at 26 °C, and a
temperature range of 26.0 °C to 50.0 °C with a temperature sensitivity of 0.0029 μm/°C. An optical
signal processing method is developed to retrieve the two cavity length changes, which is demonstrated to have a
better resolution and a faster speed than the conventional method. The sensor is expected to benefit many fronts that
require simultaneous pressure and temperature measurements with minimum intrusiveness, especially for biomedical
applications.
© 2014 IEEE
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