| Autor: |
Rerkratn A; School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand., Prombut S; School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand., Kamsri T; Thai Microeletronics Center (TMEC), Chachoengsao 24000, Thailand., Riewruja V; School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand., Petchmaneelumka W; School of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand. |
| Jazyk: |
angličtina |
| Zdroj: |
Sensors (Basel, Switzerland) [Sensors (Basel)] 2022 May 31; Vol. 22 (11). Date of Electronic Publication: 2022 May 31. |
| DOI: |
10.3390/s22114176 |
| Abstrakt: |
A procedure for the precise determination and compensation of the lead-wire resistance of a resistance transducer is presented. The proposed technique is suitable for a two-wire resistance transducer, especially the resistance temperature detector (RTD). The proposed procedure provides a technique to compensate for the lead-wire resistance using a three-level pulse signal to excite the RTD via the long lead wire. In addition, the variation in the lead-wire resistance disturbed by the change in the ambient temperature can also be compensated by using the proposed technique. The determination of the lead-wire resistance from the proposed procedure requires a simple computation method performed by a digital signal processing unit. Therefore, the calculation of the RTD resistance and the lead-wire resistance can be achieved without the requirement of a high-speed digital signal processing unit. The proposed procedure is implemented on two platforms to confirm its effectiveness: the LabVIEW computer program and the microcontroller board. Experimental results show that the RTD resistance was accurately acquired, where the measured temperature varied from 0 °C to 300 °C and the lead-wire resistance varied from 0.2 Ω to 20 Ω, corresponding to the length of the 26 American wire gauge (AWG) lead wire from 1.5 m to 150 m. The average power dissipation to the RTD was very low and the self-heating of the RTD was minimized. The measurement error of the RTD resistance observed for pt100 was within ±0.98 Ω or ±0.27 °C when the lead wire of 30 m was placed in an environment with the ambient temperature varying from 30 °C to 70 °C. It is evident that the proposed procedure provided a performance that agreed with the theoretical expectation. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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