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Source publication
Temperature measurement is a very important measurement project in spacecraft vacuum thermal test, and thermocouple measurement system is generally used for temperature measurement. In order to reduce the number of wire measuring circuit and improving the measurement system of anti disturbance and high measurement accuracy in vacuum thermal test pr...
Contexts in source publication
Context 1
... overall hardware connection of the system is shown as in Fig. 1, mainly made up of the following parts: digital temperature sensor (DS18B20), splitter, acquisition equipment, switch, server and monitoring computer(PC). Acquisition devices receive the digital signal sent by the digital temperature sensor DS18B20 over and convert it to temperature data. All temperature sensors are mounted on a single bus through the splitter, thus reducing the number of measurement leads. PC monitors and manages the whole temperature measurement process, including setting of system parameters, touring temperature at each temperature measurement point, displaying temperature information in real time, and temperature alarm exceeding the upper and lower ...
Context 2
... order to verify the accuracy of the system to measure the temperature and linearity indicators, digital temperature measurement system was tested. was carried out in space environment simulator of Beijing Institute of Satellite Environmental Engineering. The selected calibration device was a copper cylinder with a diameter of 100mm and a height of 100mm, as shown in Figure 10. A hole with a diameter of 40mm and a height of 40mm was drilled in the middle of the ...
Context 3
... thermal inertia of the specimen is relatively large, and the cavity can form a temperature field with a relatively uniform temperature. Place a Pt100 and two DS18B20 temperature sensors in the inner cavity, then inject vacuum thermal grease. It can be considered that the temperature field of each temperature sensor in the cavity is the same. Figure 10 The calibration ...
Context 4
... to the data in Table 1, the temperature error curve between the digital temperature measurement system and the platinum resistance temperature measurement system can be obtained. As can be seen from Figure 11, the difference between the digital temperature measurement system and the platinum resistance temperature measurement system is within 0.5 ℃. Both error 1 and error 2 are positive, due to the thermal inertia of the digital temperature sensor DS18B20 that is greater than the thermal inertia of the ...
Context 5
... measurement range of -55℃~ +125 ℃, the normal measurement of the full scale of 50% to 70%. In order to ensure the measurement accuracy of DS18B20, taking the temperature data in the range of -10 ℃ ~ + 80 ℃ , we found that the maximum deviation of the calibration curve and fitting curve appears in the temperature range of -10 ℃ ~ 0 ℃, as shown in Figure 12 Show. It can be seen from the calculation results, digital temperature measurement system has a very good ...
Citations
The traditional temperature measurement and control system of chemical instruments can not accurately grasp the basic condition of temperature data, resulting in low efficiency of measurement and control. Therefore, a temperature measurement and control system of chemical instruments based on the Internet of things is designed. According to the relevant performance of the hardware components of the system, the system information of the control center is studied, and the correlation of the internal system is studied. Based on this, the command of hardware mode transformation is executed. After the hardware design is realized, the system software design is realized on the premise of hardware data. Combined with the measurement and control algorithm, the measurement and control mode of the center is continuously studied, the data difference between the systems is adjusted, and the contradiction between the measurement and control data is avoided. The experimental results show that the design of chemical instrument temperature measurement and control system based on Internet of things has higher measurement and control efficiency, shorter measurement and control time, and improves the accuracy of measurement and control.
