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

Inactive Publication Date: 2018-08-28
BEIJING INST OF SPACECRAFT SYST ENG
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) The voltage measurement value range after the signal conditioning circuit is small, that is, the effective voltage range is narrow, and the utilization rate of the AD converter is extremely low, resulting in low temperature measurement resolution
At present, the measurement system with a temperature measurement accuracy of 0.03°C needs to use a 24-bit AD converter. High-bit AD converters lead to longer measurement time. In order to ensure real-time performance, it is necessary to increase the number of AD converters to complete all loops within the specified time. For measurement, high-level AD converters are expensive and used in large quantities, which greatly increases the cost of a single machine
[0006] (2) The accuracy and long-term stability of the reference resistor have a great influence on the temperature measurement results. Usually, the reference resistor is arranged inside the temperature measurement stand-alone. Improvement of temperature measurement accuracy
[0007] (3) The size of the output voltage signal is related to the nominal resistance of the platinum resistor. In high-accuracy temperature measurement, it is often necessary to use PT1000 to increase the output voltage signal. In order to reduce self-heating, a smaller excitation current is required. Often in engineering Using 0.3mA excitation current increases the design cost

Method used

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  • Method for improving measuring precision of resistance type temperature sensor
  • Method for improving measuring precision of resistance type temperature sensor
  • Method for improving measuring precision of resistance type temperature sensor

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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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Abstract

The invention provides a method for improving the measuring precision of a resistance type temperature sensor. Improving from the aspect of the temperature measuring method, the temperature is measured by measuring the temperature difference between a temperature sensor and a reference resistor, and the bias voltage is eliminated by designing the resistance value of the reference resistor, so thatthe digit of an AD converter is used to the largest extent, the temperature measuring resolution is improved, and then the temperature measuring precision is effectively improved.

Description

technical field [0001] The invention relates to a method for improving the measurement accuracy of a temperature sensor, which belongs to the technical field of spacecraft temperature measurement. Background technique [0002] Platinum resistance temperature sensor has many advantages such as high precision, good linearity, and fast response, and is widely used as an ideal temperature measuring element in spacecraft precision measurement systems. In terms of high-precision temperature measurement, platinum resistors are usually used as temperature sensors on satellites, and constant current sources are used to excite platinum resistors to measure the voltage at both ends of platinum resistors, and then the voltage signal is amplified, and the amplified voltage signal is sent to AD conversion Quantify the device, and finally calculate the temperature according to the voltage value to complete high-precision temperature measurement, such as figure 1 shown. Using this tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/24
CPCG01K7/24
Inventor 童叶龙赵欣李一凡周宇鹏林文竹
Owner BEIJING INST OF SPACECRAFT SYST ENG
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