Temperature measuring system and method based on platinum resistor
A technology of temperature measurement and platinum resistance, which is applied in the direction of measuring heat, thermometers and thermometers using electric/magnetic elements that are directly sensitive to heat, and can solve the problems of not many related applications, reducing the stability of temperature measuring circuits, and increasing circuit costs, etc. question
Active Publication Date: 2016-07-20
BEIJING XIANQU WEIFENG TECH DEV
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Problems solved by technology
These methods face several problems: 1) The acquisition of a high-precision current source generally requires a very complex circuit to achieve, which increases the complexity of the entire temperature measurement circuit, and at the same time increases the complexity of debugging, reducing the overall temperature measurement. The stability of the circuit; 2) The requirements for the accuracy and temperature stability of the components in the circuit are very high, which increases the cost of the circuit; 3) Using an integrated current source chip to obtain a highly stable current is another option. In terms of precision temperature measurement, there are not many related applications
Method used
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Embodiment
[0108] In this embodiment, the current source uses the REF200 chip, the analog-to-digital converter uses the ADS1232 chip, the platinum resistor uses Pt1000, and the reference resistor R 1 is 1000 ohms, the divider resistor R 2 It is 10000 ohms, the magnification factor A is 64 times, the power supply voltage is 5 volts, the microcontroller is AtMega32, and the equivalent reference resistor 1000.8165 ohms, the equivalent voltage divider resistance It is 9976.5156 ohms, and several experiments are carried out to obtain multiple sets of temperature measurement values, as shown in Table 1.
[0109] Table 1
[0110]
[0111]
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The invention discloses a temperature measuring system based on a platinum resistor.The system comprises the platinum resistor Rt, a current source 1, an analog-digital converter 2, a calculation module, a reference resistor R1 and a divider resistor R2.The current source 1 is used for providing stable current.The analog-digital converter 2 is used for analog-digital conversion of difference between voltage drop of the platinum resistor Rt and voltage drop of the reference resistor R1, a conversion result is transmitted to the calculation module, the calculation module is used for receiving the conversion result, and the resistance value of the platinum resistor Rt is obtained according to the result to obtain a temperature value.The system is simple in hardware circuit structure, the number of devices is small, debugging is convenient, the system has good stability, a high-precision measurement result is obtained at low cost, and measurement precision of the system is as high as 0.05 degree.
Description
technical field [0001] The invention relates to the field of modern information technology, mainly to the field of temperature measurement, in particular to a platinum resistance temperature measurement system and a measurement method thereof. Background technique [0002] Temperature is one of the most basic environmental parameters. People's lives are closely related to the temperature of the environment. In the fields of scientific research and industrial production, temperature is an important condition for the physical and chemical changes of various substances. In the fields of fine chemistry, biomedicine, precision machining, and precision instruments, the requirements for temperature control accuracy are extremely high, and the core of temperature control is temperature measurement. Therefore, it is of great significance to study temperature measurement systems and measurement methods. [0003] At present, temperature measurement methods can be generally divided into...
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Login to View More IPC IPC(8): G01K7/18G01K7/20
CPCG01K7/18G01K7/206
Inventor 卓晴唐振宇夏吉安
Owner BEIJING XIANQU WEIFENG TECH DEV