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## Microprocessor resonant magnetoelastic force transducer

#### Abstract

The aim of the study was to prepare a measuring station for force measurement using a microprocessor resonant magnetoelastic force transducer. For this purpose, first of all, magnetoelastic force transducers were prepared - a wire made of magnetoelastic material wrapped in several layers copper of wire, at the ends of which hooks were made to suspend the load. A transducer prepared in such a way served as a coil later used as an element of an oscillator. Thanks to the use of such a construction, we obtain an oscillator with variable characteristics depending on the force to which the transducer is subjected. Having prepared this system, the characteristics of the transducers were measured. For this purpose an oscilloscope and a frequency meter were used and measurements of frequency were taken while subjecting the transducers to variable force under different voltages. This allowed to choose the transducer and voltage with the smallest hysteresis loop - it turned out that the field of hysteresis decreases with the increase in the number of coils on the transducer and the increase in the supply voltage. After selecting the most accurate sensor, the system was expanded to include a microprocessor to serve as a frequency meter, which will then convert the frequency to force, in accordance to a linear fit implemented on the basis of the previous measurements. Due to the simplicity of the software and the price of the system, the popular Arduino was used. Due to the fact that Arduino supports an input voltage not greater than 12V it was necessary to additionally construct a voltage regulator at its input. Moreover, in order to read the frequency, Arduino requires a quasi-logical signal, so a comparator was mounted at the Arduino input. After assembling the system and programming Arduino to read the frequency, 5 series of measurements were made. From these 5 series the one with the smallest hysteresis loop was selected and on its basis a linear fit of frequency to force was performed. After reprogramming Arduino for force measurement, the measurement was repeated. The results of all measurements are characterized by low accuracy, high variability in time and significant field of the hysteresis loop. For force measurement the deviation reached up to 50%. In order to increase the accuracy of measurement it is necessary to increase the accuracy of the frequency generator. For this purpose, a generator with greater stability should be used. Frequency reading would also have to be more stable, which can be achieved by using a microprocessor with stabilized quartz. What is more, the sensor used should be resistant to temperature.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Title in Polish
Mikroprocesorowy przetwornik rezonansowy magnetoelastycznych czujników siły
Supervisor
Michał Nowicki (FM/IMBE) Michał Nowicki,, The Institute of Metrology and Biomedical Engineering (FM/IMBE)Faculty of Mechatronics (FM)
Certifying unit
Faculty of Mechatronics (FM)
Affiliation unit
The Institute of Metrology and Biomedical Engineering (FM/IMBE)
Study subject / specialization
, Mechatronika
Language
(pl) Polish
Status
Finished
Defense Date
11-09-2019
Issue date (year)
2019
Reviewers
Michał Nowicki (FM/IMBE) Michał Nowicki,, The Institute of Metrology and Biomedical Engineering (FM/IMBE)Faculty of Mechatronics (FM) Roman Szewczyk (FM/IMBE) - Sieć Badawcza ŁUKASIEWICZ – Przemysłowy Instytut Automatyki i Pomiarów (PIAP) Roman Szewczyk,, The Institute of Metrology and Biomedical Engineering (FM/IMBE)Faculty of Mechatronics (FM)Author's external affiliation: Sieć Badawcza ŁUKASIEWICZ – Przemysłowy Instytut Automatyki i Pomiarów (PIAP)
Keywords in Polish
magnetoelastyczny przetwornik siły, przetwornik częstotliwościowy, arduino
Keywords in English
magnetoelastic force transducer, resonant transducer, arduino
Abstract in Polish
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MT_1st_269982.pdf
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Identyfikator pracy APD: 35771

Uniform Resource Identifier
urn:pw-repo:WUTbe901d1a922b4166931868c63a3296ad