Abstract
The aim of the work is to analyze the possibilities to reduce the temperature measurement errors which emerge when using semiconductor analogous and digital sensors and thermistor-based sensors. The dependence of the output signal of the semiconductor temperature sensors in respect of the temperature is non-linear. By using the additional calibration at the several reference temperature points the sensor output signal dependencies on the temperature can be linearized better. In this way it is possible to reduce the temperature measurement errors several times and/or expand the range of the measured temperatures without the use of the expensive and precise temperature sensors. It was shown that for the sensors type DS620 the errors after the additional linearization and correction in the range (20-90) 0C did not exceed ±0.035 0C. The experimental and calculation results are provided. Ill. 8, bibl. 11, tabl. 1 (in English; abstracts in English and Lithuanian). http://dx.doi.org/10.5755/j01.eee.112.6.443
Highlights
There are several classes of semiconductor temperature sensors: voltage output sensors; current output sensors; analog output sensors; digital output sensors and resistance output sensors – thermistors.The contemporary analog and digital semiconductor temperature sensors are made on the base of technology of integrated circuits, where a transistor the collector of which is connected to the base is used as the p-n junction.The principle of the analog and digital output temperature sensor is that the forward base-emitter voltage UBE of a transistor is temperature and current dependent according to the following equation [1] U BE U BO 1 T T0 ) U BIO T T0 nkT q ln kT q IE I E0 (1)
By using the second order polynomial to linearize the characteristic of the sensor type LM35 it is possible to achieve the decrease of measurement errors: STDEV were respectively 0.210 and 0.0253
In case of sensors type LM35A the linearization using the second order polynomial does not provide the significant reduction of errors: STDEV were respectively 0.0448 and 0.0358
Summary
There are several classes of semiconductor temperature sensors: voltage output sensors; current output sensors; analog output sensors; digital output sensors and resistance output sensors – thermistors. The contemporary analog and digital semiconductor temperature sensors are made on the base of technology of integrated circuits, where a transistor the collector of which is connected to the base is used as the p-n junction (diode). The principle of the analog and digital output temperature sensor is that the forward base-emitter voltage UBE of a transistor is temperature and current dependent according to the following equation [1] U BE U BO 1 T T0 ) U BIO T T0 nkT q ln kT q IE I E0 (1)
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