Wavelength and polarization effects in actively tunable thin film resonators for thermal drift compensation

2011 ◽  
Author(s):  
P. Metz ◽  
M. C. Krantz ◽  
M. Gerken
Keyword(s):  
Thin Film ◽  
Thermal Drift ◽  
Polarization Effects ◽  
Drift Compensation ◽  
Thin Film Resonators

scholarly journals Implantable Blood Pressure Sensors with Analogic Thermal Drift Compensation

2021 ◽  
Vol 6 (1) ◽  
pp. 34
Author(s):  
Serigne Modou Die Mbacke ◽  
Mohammed El Gibari ◽  
Benjamin Lauzier ◽  
Chantal Gautier ◽  
Hongwu Li
Keyword(s):  
Output Voltage ◽  
Pressure Sensors ◽  
Equivalent Model ◽  
Battery Life ◽  
Implantable Sensors ◽  
Thermal Drift ◽  
Research Activity ◽  
Drift Compensation ◽  
The Cost ◽  
Conditioning Circuit

Implantable pressure sensors represent an important part of the research activity in laboratories. Unfortunately, their use is limited by cost, autonomy and temperature-related drifts. The cost of use depends on several parameters, particularly their low battery life and the need for miniaturization to be able to implant the animals and monitor them over a time that is long enough to be physiologically relevant. This paper studied the possibility of reducing the thermal drift of implantable sensors. To quantify and compensate for the thermal drift, we developed the equivalent model of the piezoresistive probe by using the Cadence software. Our model takes into account the temperature (34–39 °C) as well as the pressure (0–300 mmHg). We were thus able to identify the source of the drift and thanks to our model, we were able to compensate for it thanks to the compensation circuits added to the conditioning circuits of the sensor. The maximum relative drift of the sensor is (0.1 mV/°C)/3.6 mV (2.7%), a drift of the conditioning circuit is (0.98 mV/°C)/916 mV (0.1%) and the whole is (13.4 mV/°C)/420 mV (32%). The compensated sensor shows a relative maximum drift of (0.371 mV/°C)/405 mV (0.09%). The output voltage remains stable over the measurement temperature range.

Analysis of Piezoelectric Thin Film Resonators with Acoustic Quarter-Wave Multilayers

2000 ◽  
Vol 39 (Part 1, No. 5B) ◽  
pp. 3049-3053 ◽  
Author(s):  
Hirofumi Kanbara ◽  
Hideaki Kobayashi ◽  
Kiyoshi Nakamura
Keyword(s):  
Thin Film ◽  
Quarter Wave ◽  
Piezoelectric Thin Film ◽  
Thin Film Resonators
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