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Title:Measurements of Small Frequency Differences by Dual Mode 4 MHz Quartz Sensors
Authors:ID Matko, Vojko (Author)
Files:.pdf Matko-2023-Measurements_of_Small_Frequency_Dif.pdf (4,21 MB)
MD5: 5F8F76F43233145DFE886A1112452B92
 
URL https://www.mdpi.com/1424-8220/23/6/3220
 
Language:English
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FERI - Faculty of Electrical Engineering and Computer Science
Abstract:We proposed a method for measuring frequency differences of the order of a few Hz with an experimental error lower than 0.0001% by using two 4 MHz quartz oscillators, the frequencies of which are very close (a few 10 Hz difference) due to the dual mode operation (differential mode with two temperature-compensated signal frequencies or a mode with one signal and one reference frequency). We compared the existing methods for measuring frequency differences with the new method which is based on counting the number of transitions through zero within one beat period of the signal. The measuring procedure requires equal experimental conditions (temperature, pressure, humidity, parasitic impedances etc.) for both quartz oscillators. To ensure equal resonant conditions for oscillation two quartz crystals are needed, which form a temperature pair. The frequencies and resonant conditions of both oscillators must be almost equal, which is achieved by an external inductance or capacitance. In such a way, we minimized all the external effects and ensured highly stable oscillations and high sensitivity of the differential sensors. The counter detects one beat period by an external gate signal former. By using the method of counting transitions through zero within one beat period, we reduced the measuring error by three orders of magnitude, compared to the existing methods.
Keywords:small frequency difference measurement, temperature-compensated quartz sensors, differential sensors, quartz oscillators, transitions-through-zero method
Publication status:Published
Publication version:Version of Record
Submitted for review:02.02.2023
Article acceptance date:15.03.2023
Publication date:17.03.2023
Publisher:MDPI
Year of publishing:2023
Number of pages:Str. 1-11
Numbering:Letn. 23, Št. 6, št. članka 3220
PID:20.500.12556/DKUM-87733 New window
UDC:621.317
ISSN on article:1424-8220
COBISS.SI-ID:145579779 New window
DOI:10.3390/s23063220 New window
Copyright:© 2023 by the author
Publication date in DKUM:26.03.2024
Views:357
Downloads:246
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
MATKO, Vojko, 2023, Measurements of Small Frequency Differences by Dual Mode 4 MHz Quartz Sensors. Sensors [online]. 2023. Vol. 23, no. Št. 6,  članka 3220, p. 1–11. [Accessed 23 January 2025]. DOI 10.3390/s23063220. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=87733
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Record is a part of a journal

Title:Sensors
Shortened title:Sensors
Publisher:MDPI
ISSN:1424-8220
COBISS.SI-ID:10176278 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P2-0028
Name:Mehatronski sistemi

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:17.03.2023

Secondary language

Language:Slovenian
Keywords:majhne frekvence meritev, senzorji, oscilatorji


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