Method for improving measuring precision of resistance type temperature sensor
A temperature sensor and measurement accuracy technology, applied in the field of spacecraft temperature measurement, can solve the problems of high accuracy and long-term stability of temperature measurement results, low temperature measurement resolution, small excitation current, etc., to improve temperature measurement accuracy and Stability, improve the temperature measurement resolution, improve the effect of response speed
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Embodiment 1
[0026] This embodiment provides a method for improving the measurement accuracy of a resistance temperature sensor. The temperature is measured by measuring the potential difference between the temperature sensor and a reference resistor.
[0027] Such as image 3 As shown, the resistance-type temperature sensor in this embodiment is a platinum resistor, and the platinum resistor is connected in series with the reference resistor, and a constant current source is used for excitation, and the excitation current is I EX , that is, the constant current source provides the excitation current for the platinum resistor and the reference resistor as I EX .
[0028] The resistance value of the reference resistor R REF According to the set high-precision temperature measurement temperature zone (measurement lower limit temperature T min ~ Measuring upper limit temperature T max ) design, the voltage offset is completed by designing the resistance value of the reference resistor. I...
Embodiment 2
[0043] On the basis of the above-mentioned embodiment 1, in order to eliminate the influence of the long-term stability of the constant current source on the temperature measurement accuracy, an additional set is used for real-time measurement of the excitation current I EX standard resistance channels such as Figure 4 shown.
[0044] The standard resistance channel is set in parallel with the platinum resistance and the reference resistance with a standard resistance R f The circuit channel, the constant current source provides the excitation current I for the standard resistance channel and the measurement channel where the platinum resistance and the reference resistance are located. EX , measure the voltage U across the standard resistance channel f , and transmitted to the AD converter, the AD converter converts the analog voltage signal into a digital voltage signal, sends it to the single-chip computer system, and calculates the actual excitation current I′ EX : I' ...
Embodiment 3
[0050] Since the accuracy and long-term stability of the reference resistor have a great influence on the temperature measurement results, in this embodiment, both the platinum resistor and the reference resistor are placed on the temperature control object to eliminate the temperature drift of the reference resistor.
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