Dual Purpose Measurements with Displacement Sensors
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| Title: | Dual Purpose Measurements with Displacement Sensors |
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| Language: | English |
| Authors: | Andrio, Andreu, del Castillo, Luis Felipe, Compañ, Vicente |
| Source: | European Journal of Physics Education. 2020 11(2):24-34. |
| Availability: | Erciyes University. Melikgazi, Kayseri, 38039 Turkey. Tel: +90-352-207-6666; Web site: http://www.eu-journal.org/index.php/EJPE |
| Peer Reviewed: | Y |
| Page Count: | 11 |
| Publication Date: | 2020 |
| Document Type: | Journal Articles Reports - Research |
| Descriptors: | Science Instruction, Science Laboratories, Measurement Equipment, Laboratory Equipment, Science Experiments, Laboratory Experiments, Energy, Magnets, Scientific Concepts, Concept Formation, Thermodynamics |
| ISSN: | 1309-7202 |
| Abstract: | In this paper, we show a laboratory experience describing the possibility to build a sensor using a coil to measure small thicknesses of materials with the possibility of measuring temperature simultaneously, with the same built sensor. Its operation is based on the following facts: An electric current (a.c), flows through a coil and a magnetic field appears producing self-induction characterized by an electromotive force induced in the coil when a conductive piece is situated in front of the coil. That permits us to obtain information about the distance between the coil and the conductive piece. When this separation thickness is changing, the magnetic field around the coil changes, because the self-induction coefficient (L) is also changing. Using resistance and impedance measurements (voltage in our case) in the coil, an expression has been obtained for the determination of the thickness of a non-conductive sheet placed between a metallic plate and the coil. Calibration measurements of resistance with temperature have been obtained. The thermodynamic analysis is also presented showing the equation of state of the system between the voltage, temperature, and the thickness of the non-conductive sample. The linear thermal expansion coefficient of the sample is also determined. |
| Abstractor: | As Provided |
| Entry Date: | 2021 |
| Accession Number: | EJ1300055 |
| Database: | ERIC |
| Abstract: | In this paper, we show a laboratory experience describing the possibility to build a sensor using a coil to measure small thicknesses of materials with the possibility of measuring temperature simultaneously, with the same built sensor. Its operation is based on the following facts: An electric current (a.c), flows through a coil and a magnetic field appears producing self-induction characterized by an electromotive force induced in the coil when a conductive piece is situated in front of the coil. That permits us to obtain information about the distance between the coil and the conductive piece. When this separation thickness is changing, the magnetic field around the coil changes, because the self-induction coefficient (L) is also changing. Using resistance and impedance measurements (voltage in our case) in the coil, an expression has been obtained for the determination of the thickness of a non-conductive sheet placed between a metallic plate and the coil. Calibration measurements of resistance with temperature have been obtained. The thermodynamic analysis is also presented showing the equation of state of the system between the voltage, temperature, and the thickness of the non-conductive sample. The linear thermal expansion coefficient of the sample is also determined. |
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| ISSN: | 1309-7202 |
