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

Overview
Journal Sensors (Basel)
Publisher MDPI
Specialty Biotechnology
Date 2016 Jul 2
PMID 27367688
Citations 2
Authors
Vojko Matko
Miro Milanovic
Affiliations
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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.

Citing Articles

A Non-Linear Temperature Compensation Model for Improving the Measurement Accuracy of an Inductive Proximity Sensor and Its Application-Specific Integrated Circuit Implementation.

Wang L, Tao H, Dong H, Shao Z, Wang F Sensors (Basel). 2020; 20(17).

PMID: 32899388 PMC: 7506972. DOI: 10.3390/s20175010.

Dimension-Reduced Analog-Digital Mixed Measurement Method of Inductive Proximity Sensor.

Guo Y, Shao Z, Tao H, Xu K, Li T Sensors (Basel). 2017; 17(7).

PMID: 28665320 PMC: 5539794. DOI: 10.3390/s17071533.

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