CN102661816A - Liquid nitrogen temperature continuously and automatically measuring device - Google Patents
Liquid nitrogen temperature continuously and automatically measuring device Download PDFInfo
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- CN102661816A CN102661816A CN2012101589989A CN201210158998A CN102661816A CN 102661816 A CN102661816 A CN 102661816A CN 2012101589989 A CN2012101589989 A CN 2012101589989A CN 201210158998 A CN201210158998 A CN 201210158998A CN 102661816 A CN102661816 A CN 102661816A
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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
The present invention relates to a kind of automatic system of temperature measurement, relate in particular to high precision liquid nitrogen temperature measurement mechanism.
Background technology
Belt material of high temperature superconduct need be operated in the liquid nitrogen environment, and the high temperature superconductor coil that is formed by the belt material of high temperature superconduct coiling is the important component part of high-temperature superconductor electric device.Need monitor the duty of high temperature superconductor coil during the work of high-temperature superconductor electric device, and the temperature survey of high temperature superconductor coil is an important parameter of its duty of monitoring.Temperature can raise before the high temperature superconductor coil quench, and its temperature rising state is to investigate high temperature superconductor coil quench whether important criterion, so need carry out high-acruracy survey to its temperature.Platinum-resistance thermometer is generally used in the measurement of liquid nitrogen temperature, and platinum-resistance thermometer can be operated in the liquid nitrogen environment.Be the linearity curve relation between platinum-resistance thermometer temperature of not demarcating and the resistance, error reaches as high as ± 0.5K, is the nonlinear curve relation between platinum-resistance thermometer temperature that process is demarcated and the resistance, and error can reach ± 0.1K.
Patent CN101251425A discloses a kind of method and apparatus of on-line monitoring high temperature superconducting cable conductor temperature; This inventive method comprises the steps: to be attached to cryogenic temperature sensor on the high-temperature superconductive cable conductor; Adopt four leads method to pick out the test lead of this cryogenic temperature sensor, the test lead of cryogenic temperature sensor is inserted corresponding temperature fiber optic switching module.The temperature fiber optic switching module links to each other with modularized distribution type I/O system; Modularized distribution type I/O system is connected to computing machine, utilizes computing machine that input signal is handled, and the temperature that shows and store said high-temperature superconductive cable conductor.This invention can be implemented in liquid nitrogen temperature the high-temperature superconductive cable conductor is carried out the precise dose monitoring, and realizes high voltage isolation monitoring simultaneously.
In the method and apparatus of on-line monitoring high temperature superconducting cable conductor temperature that above-mentioned patent documentation discloses; The platinum-resistance thermometer of used cryogenic temperature sensor for demarcating; Its test lead accesses to modularized distribution type I/O system through the temperature fiber optic switching module; And modularized distribution type I/O system and computing machine pass through the RS232 communication, and RS232 serial communication speed is slower, when very fast as if temperature variation; The temperature value that can not accurately and timely reflect the measured point has also just reduced the precision of temperature test.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, propose a kind of high precision liquid nitrogen temperature apparatus for continuous and automatic measurement.The present invention can carry out liquid nitrogen temperature more fast more accurately and measure.Apparatus of the present invention can be applicable to the liquid nitrogen temperature measuring system of various superconducting apparatus.
High precision liquid nitrogen temperature apparatus for continuous and automatic measurement of the present invention comprises following a few part: platinum-resistance thermometer, platinum-resistance thermometer calibration scale, constant current source, digital voltmeter and computer control system.Data collecting card and LabVIEW software are housed in the computer control system.
Platinum-resistance thermometer is installed in the test point of required probe temperature, adopts four leads method to pick out the test lead of platinum-resistance thermometer.Four test leads of platinum-resistance thermometer, two current feeds access to constant current source, and other two voltage leads access to digital voltmeter.Described constant current source is fixed near the platinum-resistance thermometer, is used for to the platinum-resistance thermometer supply of current.Described digital voltmeter is connected through parallel 488 data lines with computer control system and carries out communication.Described data collecting card is used for the collection and the processing of data.LabVIEW software is installed in the computer control system, be used for to the survey data gather, show, table look-up, waveform demonstration, storage and mathematical operation etc.Platinum-resistance thermometer is installed on the equipment of measured temperature point, and in order to improve precision, to reduce line loss, constant current source is fixed on the near as far as possible position of platinum-resistance thermometer.Computer control system generally is installed in the Control Room, so that the survey data are kept watch on and operated.
Platinum-resistance thermometer is installed in the local of required probe temperature and fixing, and constant current source provides the working current of 1mA to platinum-resistance thermometer, and platinum-resistance thermometer is in running order.Platinum-resistance thermometer is transferred to digital voltmeter with the magnitude of voltage of measured temperature, and digital voltmeter and computer control system are transferred to computer control system through parallel 488 communications with institute's survey platinum-resistance thermometer magnitude of voltage.The LabView software program is installed in the computer control system; The LabView program is at first read the magnitude of voltage that is transferred to the platinum-resistance thermometer that comes from digital voltmeter; Calculate corresponding temperature value through method of interpolation according to the platinum-resistance thermometer calibration scale then; And be presented at program interface, go back may observe temperature value trend map on the program display interface.
The present invention transfers to computer system with the resistance value of survey liquid nitrogen; Utilize the LabView program to utilize the difference look-up table to check in corresponding temperature value the resistance value of being surveyed then; And be presented on the software program interface, thereby realize liquid nitrogen temperature high precision continuous automatic measurement.
Digital voltmeter and computing machine can effectively improve data rate through parallel 488 data in apparatus of the present invention, thereby lower thermometric error.But the temperature value of apparatus of the present invention high precision continuous automatic measurement platinum-resistance thermometer, precision can up to standardly be decided meter accuracy, and the temperature value of being surveyed is presented on the display screen, but the temperature value that real-time monitored is surveyed.
Description of drawings:
Fig. 1 high precision liquid helium temperature apparatus for continuous and automatic measurement is formed synoptic diagram, among the figure: 1 platinum-resistance thermometer, 2 digital voltmeters, 3 computer control systems, 4 display screens, 5 constant current sources.
Embodiment
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
As shown in Figure 1, apparatus of the present invention comprise platinum-resistance thermometer 1, digital voltmeter 2, computer control system 3, display screen 4, constant current source 5.Platinum-resistance thermometer 1 is installed in required probe temperature point part and fixing.Constant current source 5 provides working current for platinum-resistance thermometer 1, and in order to reduce line error, constant current source 5 is placed near the platinum-resistance thermometer 1.Constant current source 5 is input as the 220VAC signal; The output current of regulating constant current source 5 is also constant in 1mA; The electric current output line of constant current source 5 adopts welding manner to be connected with the current feed of platinum-resistance thermometer 1; To guarantee the current feed connection stability, constant current source 5 gives platinum-resistance thermometer 1 supply steady current.For the ease of monitoring, digital voltmeter 2, display screen 4 and computer control system 3 are placed on Control Room.Digital voltmeter 2 is placed on computer control system 3 annexes, carries out communication with computer control system 3 through parallel 488 data lines.The voltage tester line of digital voltmeter 2 adopts welding manner to be connected with the voltage lead at platinum-resistance thermometer 1 two ends; To guarantee the voltage lead connection stability; Digital voltmeter 2 is used to test the magnitude of voltage of platinum-resistance thermometer 1; And institute is surveyed magnitude of voltage transfer to computer control system 3, computer control system 3 is through LabView software, and the temperature value that the magnitude of voltage of being surveyed is corresponding is presented on the display screen 4.Display screen 4 is connected through the VGA data line with computer control system.The program continuously-running is realized liquid nitrogen temperature high precision continuous automatic measurement.
Apparatus of the present invention are stable, and reliability is high.
Claims (1)
1. a liquid nitrogen temperature apparatus for continuous and automatic measurement is characterized in that, described measurement mechanism comprises platinum-resistance thermometer (1), digital voltmeter (2), computer control system (3), constant current source (5); Platinum-resistance thermometer (1) is installed in required probe temperature point part and fixing; Constant current source (5) is placed near the platinum-resistance thermometer (1), and constant current source (5) provides working current for platinum-resistance thermometer (1), and the output of constant current source (5) is connected to the two ends of the current feed of platinum-resistance thermometer (1); Digital voltmeter (2) carries out communication with computer control system (3); The voltage tester line of digital voltmeter (2) inserts the voltage lead at platinum-resistance thermometer (1) two ends, is used to test the magnitude of voltage of platinum-resistance thermometer (1), and institute's survey magnitude of voltage is transferred to computer control system (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101589989A CN102661816A (en) | 2012-05-21 | 2012-05-21 | Liquid nitrogen temperature continuously and automatically measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101589989A CN102661816A (en) | 2012-05-21 | 2012-05-21 | Liquid nitrogen temperature continuously and automatically measuring device |
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| CN102661816A true CN102661816A (en) | 2012-09-12 |
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| CN2012101589989A Pending CN102661816A (en) | 2012-05-21 | 2012-05-21 | Liquid nitrogen temperature continuously and automatically measuring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196573A (en) * | 2013-04-23 | 2013-07-10 | 中国科学院上海应用物理研究所 | Accurate temperature measurement device for liquid helium temperature area |
| CN104155025A (en) * | 2014-07-24 | 2014-11-19 | 北京航天发射技术研究所 | Temperature detection system and temperature transmitter for low-temperature liquid medium |
| CN104458045A (en) * | 2014-12-09 | 2015-03-25 | 福建宁德核电有限公司 | Temperature measuring system |
| CN106289548A (en) * | 2016-07-28 | 2017-01-04 | 广州赛莱拉干细胞科技股份有限公司 | Portable liquid nitrogen temperature monitoring device and early warning system |
| CN114509707A (en) * | 2022-02-16 | 2022-05-17 | 北京优赛寰宇科技有限公司 | Superconducting coil system and self-calibration method |
| CN115978444A (en) * | 2023-03-21 | 2023-04-18 | 北京中科富海低温科技有限公司 | Low-temperature transmission system |
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| CN101957243A (en) * | 2009-07-14 | 2011-01-26 | 中国科学院空间科学与应用研究中心 | High-precision temperature measuring device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196573A (en) * | 2013-04-23 | 2013-07-10 | 中国科学院上海应用物理研究所 | Accurate temperature measurement device for liquid helium temperature area |
| CN104155025A (en) * | 2014-07-24 | 2014-11-19 | 北京航天发射技术研究所 | Temperature detection system and temperature transmitter for low-temperature liquid medium |
| CN104155025B (en) * | 2014-07-24 | 2016-08-17 | 北京航天发射技术研究所 | The system for detecting temperature of Low Temperature Liquid medium and temperature transmitter |
| CN104458045A (en) * | 2014-12-09 | 2015-03-25 | 福建宁德核电有限公司 | Temperature measuring system |
| CN106289548A (en) * | 2016-07-28 | 2017-01-04 | 广州赛莱拉干细胞科技股份有限公司 | Portable liquid nitrogen temperature monitoring device and early warning system |
| CN114509707A (en) * | 2022-02-16 | 2022-05-17 | 北京优赛寰宇科技有限公司 | Superconducting coil system and self-calibration method |
| CN115978444A (en) * | 2023-03-21 | 2023-04-18 | 北京中科富海低温科技有限公司 | Low-temperature transmission system |
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Application publication date: 20120912 |