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Sensors 2016, 16(7), 995; doi:10.3390/s16070995

High-Precision Hysteresis Sensing of the Quartz Crystal Inductance-to-Frequency Converter

1
Institute for Automation, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia
2
Institute for Robotics, Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova 17, Maribor 2000, Slovenia
*
Author to whom correspondence should be addressed.
Academic Editor: Stephane Evoy
Received: 29 April 2016 / Revised: 17 June 2016 / Accepted: 18 June 2016 / Published: 28 June 2016
(This article belongs to the Special Issue Resonator Sensors)
View Full-Text   |   Download PDF [4020 KB, uploaded 28 June 2016]   |  

Abstract

A new method for the automated measurement of the hysteresis of the temperature-compensated inductance-to-frequency converter with a single quartz crystal is proposed. The new idea behind this method is a converter with two programmable analog switches enabling the automated measurement of the converter hysteresis, as well as the temperature compensation of the quartz crystal and any other circuit element. Also used is the programmable timing control device that allows the selection of different oscillating frequencies. In the proposed programmable method two different inductances connected in series to the quartz crystal are switched in a short time sequence, compensating the crystal’s natural temperature characteristics (in the temperature range between 0 and 50 °C). The procedure allows for the measurement of the converter hysteresis at various values of capacitance connected in parallel with the quartz crystal for the converter sensitivity setting at selected inductance. It, furthermore, enables the measurement of hysteresis at various values of inductance at selected parallel capacitance (sensitivity) connected to the quartz crystal. The article shows that the proposed hysteresis measurement of the converter, which converts the inductance in the range between 95 and 100 μH to a frequency in the range between 1 and 200 kHz, has only 7 × 10−13 frequency instability (during the temperature change between 0 and 50 °C) with a maximum 1 × 10−11 hysteresis frequency difference. View Full-Text
Keywords: inductance-to-frequency converter; hysteresis; sensor switching method; inductance; temperature compensation inductance-to-frequency converter; hysteresis; sensor switching method; inductance; temperature compensation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Matko, V.; Milanović, M. High-Precision Hysteresis Sensing of the Quartz Crystal Inductance-to-Frequency Converter. Sensors 2016, 16, 995.

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