Liquid nitrogen temperature continuously and automatically measuring device

Abstract

The invention relates to a liquid nitrogen temperature continuously and automatically measuring device. The measuring device is characterized by comprising a platinum resistance thermometer (1), a digital voltmeter (2), a computer control system (3) and a constant-current source (5), wherein the platinum resistance thermometer (1) is arranged on the required test temperature point and is fixed; the constant-current source (5) is placed close to the platinum resistance thermometer (1), the constant-current source (5) provides working current for the platinum resistance thermometer (1), and the output of the constant-current source (5) is connected with the two ends of a current lead of the platinum resistance thermometer (1); the digital voltmeter (2) is communicated with the computer control system (3); and a voltage testing line of the digital voltmeter (2) accesses to the voltage leads of the two ends of the platinum resistance thermometer (1), is used for testing the voltage value of the platinum resistance thermometer (1), and transmitting the detected voltage value to the computer control system (3).

Description

technical field [0001] The invention relates to an automatic temperature measuring device, in particular to a high-precision liquid nitrogen temperature measuring device. Background technique [0002] High-temperature superconducting strips need to work in a liquid nitrogen environment, and high-temperature superconducting coils wound from high-temperature superconducting strips are important components of high-temperature superconducting power devices. When the high-temperature superconducting power device is working, it is necessary to monitor the working state of the high-temperature superconducting coil, and the temperature measurement of the high-temperature superconducting coil is an important parameter for monitoring its working state. The temperature of the high-temperature superconducting coil will rise before quenching, and its temperature rise state is an important criterion for investigating whether the high-temperature superconducting coil is quenched or not, so...

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Problems solved by technology

[0004] In the method and device for on-line monitoring of the temperature of the high-temperature superconducting cable conductor disclosed in the above-mentioned patent documents, the low-temperature temperature sensor used is a calibrated platinum resistance thermometer, and its test leads are connected to the modular distributed I / O through the temperature optical fiber conversion module. system, while the modular distributed I / O system communicates with the computer through RS232, and the RS232 serial port communication speed is relatively slow. If the temperature changes rapidly, it cannot accurately and timely reflect the temperature value of the measured point, which also reduces the temperature test. precision

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