CN101738271A - Calibration method of low-temperature temperature element - Google Patents

Calibration method of low-temperature temperature element Download PDF

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Publication number
CN101738271A
CN101738271A CN200810177312A CN200810177312A CN101738271A CN 101738271 A CN101738271 A CN 101738271A CN 200810177312 A CN200810177312 A CN 200810177312A CN 200810177312 A CN200810177312 A CN 200810177312A CN 101738271 A CN101738271 A CN 101738271A
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temperature
sensing element
terminal
cryostat
resistance
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CN200810177312A
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CN101738271B (en
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崔文德
王文革
李铁鹏
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Amir Testing Technology Co.,Ltd.
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Beijing Aerospace Institute for Metrology and Measurement Technology
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Abstract

The invention belongs to the field of temperature element calibration, and in particular relates to a calibration method of a low-temperature temperature element; and the invention aims at improving the calibration efficiency of a low-temperature temperature-sensing element and lowering the calibration cost of the low-temperature temperature-sensing element. In the invention, temperature-sensing elements are connected with constant temperature copper block terminals of a cryostat through two pins, one pin of the temperature-sensing element n is connected with a NO. n+1 terminal, and the other pin thereof is connected with a NO. n+2 terminal, wherein n is a natural number larger than 1 and smaller than 41; a standard sleeve platinum resistance thermometer is connected with NO. 45-48 terminals; the constant temperature copper block terminals and the external wiring terminals on the cryostat are in one-to-one corresponding relation; and the external wiring terminals NO. n, NO. n+1, NO. n+2 and NO. n+3 correspond to an nth passage of a scanning switch, wherein n is the natural number larger than 1 and smaller than 42. The 41 temperature-sensing elements are installed in a core of the cryostat, and compared with the installation quantity of a traditional measuring method, the installation quantity is increased by nearly 3 times, and the cost can be lowered by 75 percent. The calibration method can be applied to the field of low-temperature temperature element calibration.

Description

Calibration method of low-temperature temperature element
Technical field
The invention belongs to temperature element (TE) calibration field, be specifically related to a kind of calibration method of low-temperature temperature element.
Background technology
It is to finish in cryostat that cryogenic temperature temperature element (TE)---temperature-sensing element low temperature is demarcated.The low-temperature receiver of cryostat has two kinds, and the above warm area of 78K uses liquid nitrogen to make low-temperature receiver, and 4.2K~80K warm area uses liquid helium to make low-temperature receiver.The cryostat core structures is seen Fig. 1.Cryostat is owing to the liquid helium that uses costliness, and the latent heat of liquid helium is relative with heat of vaporization less, and therefore in order to reduce low-temperature receiver consumption, it is all less that the cryostat volume is established, and its effective usage space is also less.The measuring lead wire of element is to be wound in the cryostat fuse, and large tracts of land sticks on the metal surface, and the insulation resistance between measuring lead wire and cryostat fuse is reduced greatly.This structure is to consider factors such as measuring lead wire leakage heat and insulation resistance, the organization plan after taking all factors into consideration.The measuring lead wire terminal generally has 48 in the cryostat fuse, and wherein 4 terminals are used for measurement standard sleeve pipe platinum-resistance thermometer, and 44 remaining terminals are used for measuring temperature-sensing element.
Traditional calibration measurement method as shown in Figure 2, this method adopts four line metering systems, comprise the steps: that (1) draws the measuring lead wire of 11 temperature-sensing elements with 44 terminals after, measure with the constant current series process; (2) external connection terminal and the scanning switch system on the connection cryostat; (3) connect constant current source, measuring resistance, scanning switch, digital voltmeter wiring; (4) liquid helium can; (5) temperature controller carries out high accuracy temperature control to the constant temperature copper billet in the cryostat fuse; (6) treat that the constant temperature precision reaches the temperature control requirement after, beginning temperature-sensing element resistance measurement.Constant current source provides the Constant Direct Current electric current to measuring resistance and component series circuit.The high accuracy number voltage table is measurement standard resistance and detected element both end voltage respectively.Draw the resistance value of tested temperature-sensing element as calculated.
The shortcoming of said method is to test once that temperature-sensing element quantity is installed is few, once install 11 at most, so experimental cost is higher.
Summary of the invention
The objective of the invention is, a kind of calibration method of low-temperature temperature element that improves low temperature temperature-sensing element calibration efficiency, reduces low temperature temperature-sensing element calibration cost is provided.
The present invention is achieved in that
A kind of calibration method of low-temperature temperature element comprises the steps:
(1) connects temperature-sensing element;
(2) external connection terminal and the scanning switch system on the connection cryostat;
(3) connect constant current source, measuring resistance, scanning switch, digital voltmeter wiring;
(4) liquid helium can;
(5) temperature control
Constant temperature copper billet in the cryostat fuse is carried out high accuracy temperature control;
(6) measure
Set up standard resistance and a tested temperature-sensing element is in current conductive state; Difference measurement standard resistance and tested temperature-sensing element both end voltage; Switch temperature-sensing element, thereby finish the measurement of each temperature-sensing element;
The concrete steps of described connection temperature-sensing element are as follows: temperature-sensing element connects by the constant temperature copper billet terminal of 2 pins with cryostat, totally 48 of constant temperature copper billet terminals, 1~No. 44 terminal is the temperature-sensing element splicing ear, the pin of temperature-sensing element n connects with the n+1 terminal, and another pin connects with the n+2 terminal; Wherein, n is greater than 1 and less than 41 natural number; The normal sleeve platinum-resistance thermometer connects terminal 45~No. 48; Constant temperature copper billet terminal is an one-to-one relationship with the external connection terminal on the cryostat;
The external connection terminal on the described connection cryostat and the concrete steps of scanning switch system are as follows: external connection terminal n number, n+1 number, n+2 number, n+3 be number corresponding to scanning switch n passage, and wherein, n is greater than 1 and less than 42 natural number.
In the aforesaid measuring process, adjust scanning switch, flow through measuring resistance, n bar lead-in wire, a n-1 temperature-sensing element, a n temperature-sensing element, a n+1 temperature-sensing element and n+3 bar of constant current source electric current I s gone between;
The resistance of n element is:
R n=(V rn/V S)·R S (1)
In the formula: R n--n temperature-sensing element internal resistance;
V Rn--n temperature-sensing element both end voltage;
R S-measuring resistance;
V S--standard resistor at two terminals voltage;
N--greater than 1 less than 41 natural number.
The invention has the beneficial effects as follows:
41 temperature-sensing elements are installed in the cryostat fuse, are had more 30, quantity is installed has improved 3 times nearly than traditional measurement method.Like this, under the suitable substantially situation of liquid helium consumption, use this method, can improve about 3 times of calibration efficiency, cost can reduce by 75%.
Description of drawings
Fig. 1 is existing cryostat core structures synoptic diagram;
Fig. 2 is existing calibration measurement method measuring principle figure;
Fig. 3 is the schematic diagram of a kind of calibration method of low-temperature temperature element of the present invention;
Fig. 4 is the 1st element measuring principle figure of a kind of cryogenic temperature element approach of the present invention
Fig. 5 is n element measuring principle figure of a kind of cryogenic temperature element approach of the present invention.
Among the figure: 1. external connection terminal, 2. cryogenic liquid vessel, 3. hot anchor, 4. measuring lead wire, 5. element and standard thermometer, 6. constant temperature copper billet.
Embodiment
Below in conjunction with drawings and Examples a kind of calibration method of low-temperature temperature element of the present invention is introduced:
As shown in Figure 3, a kind of calibration method of low-temperature temperature element mainly comprises the steps:
(1) connects temperature-sensing element
According to cryogenic temperature element calibrating standard, normal sleeve platinum-resistance thermometer, temperature-sensing element are installed in the constant temperature copper billet of cryostat; Concrete steps are as follows:
Temperature-sensing element connects by the constant temperature copper billet terminal of 2 pins with cryostat, totally 48 of constant temperature copper billet terminals, and 1~No. 44 terminal is the temperature-sensing element splicing ear, 45~No. 48 terminals are normal sleeve platinum-resistance thermometer splicing ear;
A pin of temperature-sensing element 1 is connected with No. 2 terminals with terminal 1, and another pin connects No. 1 terminal and No. 2 terminal short circuits with No. 3 terminals; A pin of temperature-sensing element 2 connects with No. 3 terminals, and another pin connects with No. 4 companies of terminal terminal; A pin of temperature-sensing element 3 connects with No. 4 terminals, and another pin connects with No. 5 terminals of terminal; And the like, the pin of temperature-sensing element n connects with the n+1 terminal, and another pin connects with the n+2 terminal, and wherein, n is greater than 1 and less than 41 natural number; A pin of temperature-sensing element 41 connects with No. 42 terminals, and another pin is connected with No. 44 terminals with No. 43 terminals, and No. 43 terminals are with No. 44 terminal short circuits; The normal sleeve platinum-resistance thermometer connects terminal 45~No. 48, and constant temperature copper billet terminal is an one-to-one relationship with the external connection terminal on the cryostat;
(2) external connection terminal and the scanning switch system on the connection cryostat
Concrete connected mode is as follows: No. 1, No. 2, No. 3,4 extra connection terminals are corresponding to the 1st passage of scanning switch, and No. 2, No. 3, No. 4,5 extra connection terminals are corresponding to scanning switch the 2nd passage; And the like, external connection terminal n number, n+1 number, n+2 number, n+3 are number corresponding to scanning switch n passage; Wherein n is greater than 1 and less than 42 natural number;
(3) connect constant current source, measuring resistance, scanning switch, digital voltmeter wiring
(4) liquid helium can
According to cryogenic temperature element calibrating standard, carry out the liquid helium can;
(5) temperature control
Open temperature controller the constant temperature copper billet in the cryostat fuse is carried out high accuracy temperature control; Temperature controller is existing common apparatus;
(6) measure
After treating that the constant temperature precision reaches the temperature control requirement, the resistance measurement of beginning temperature-sensing element.Constant current source is set provides the Constant Direct Current electric current for measuring resistance and detected element; At this moment, measuring resistance and a tested temperature-sensing element are in current conductive state.The high accuracy number voltage table is measurement standard resistance and tested temperature-sensing element both end voltage respectively.
As shown in Figure 4, when measuring the 1st temperature-sensing element, adjust scanning switch, make constant current source electric current I s flow through measuring resistance, the 1st lead-in wire, the 1st temperature-sensing element, the 2nd temperature-sensing element and the 4th lead-in wire.
Because V RiMeasure with digital voltmeter, digital voltmeter internal resistance>10G Ω, lead resistance<100 Ω is so when measuring, lead resistance can be ignored with respect to the digital voltmeter internal resistance.Thereby obtain the resistance of the 1st temperature-sensing element:
R 1=(V r1/V S)·R S (1)
In the formula: R 1--the 1st temperature-sensing element internal resistance;
V R1--the 1st temperature-sensing element both end voltage;
R S-measuring resistance;
V S--standard resistor at two terminals voltage.
As shown in Figure 5, when measuring n temperature-sensing element, adjust scanning switch, flow through measuring resistance, n bar lead-in wire, a n-1 temperature-sensing element, a n temperature-sensing element, a n+1 temperature-sensing element and (n+3) bar of constant current source electric current I s gone between;
Because V RnMeasure with digital voltmeter, digital voltmeter internal resistance>10G Ω, lead resistance<100 Ω is so when measuring, lead resistance can be ignored with respect to the digital voltmeter internal resistance.Thereby the resistance that obtains n element is:
R n=(V rn/V S)·R S (2)
In the formula: R n--n temperature-sensing element internal resistance;
V Rn--n temperature-sensing element both end voltage;
R S-measuring resistance;
V S--standard resistor at two terminals voltage;
N-greater than 1 less than 41 natural number.
Scanning switch is used for finishing the switching between the different temperature-sensing elements, thereby finishes the measurement of each temperature-sensing element.

Claims (2)

1. a calibration method of low-temperature temperature element comprises the steps:
(1) connects temperature-sensing element;
(2) external connection terminal and the scanning switch system on the connection cryostat;
(3) connect constant current source, measuring resistance, scanning switch, digital voltmeter wiring;
(4) liquid helium can;
(5) temperature control
Constant temperature copper billet in the cryostat fuse is carried out high accuracy temperature control;
(6) measure
Set up standard resistance and a tested temperature-sensing element is in current conductive state; Difference measurement standard resistance and tested temperature-sensing element both end voltage; Switch temperature-sensing element, thereby finish the measurement of each temperature-sensing element;
It is characterized in that: the concrete steps of described connection temperature-sensing element are as follows: temperature-sensing element connects by the constant temperature copper billet terminal of 2 pins with cryostat, totally 48 of constant temperature copper billet terminals, 1~No. 44 terminal is the temperature-sensing element splicing ear, the pin of temperature-sensing element n connects with the n+1 terminal, and another pin connects with the n+2 terminal; Wherein, n is greater than 1 and less than 41 natural number; The normal sleeve platinum-resistance thermometer connects terminal 45~No. 48; Constant temperature copper billet terminal is an one-to-one relationship with the external connection terminal on the cryostat;
The external connection terminal on the described connection cryostat and the concrete steps of scanning switch system are as follows: external connection terminal n number, n+1 number, n+2 number, n+3 be number corresponding to scanning switch n passage, and wherein, n is greater than 1 and less than 42 natural number.
2. a kind of calibration method of low-temperature temperature element according to claim 1, it is characterized in that: in the described measuring process, adjust scanning switch, flow through measuring resistance, n bar lead-in wire, a n-1 temperature-sensing element, a n temperature-sensing element, a n+1 temperature-sensing element and n+3 bar of constant current source electric current I s gone between;
The resistance of n element is:
R n=(V m/V S)·R S (1)
In the formula: R n--n temperature-sensing element internal resistance;
V m--n temperature-sensing element both end voltage;
R S-measuring resistance;
V S--standard resistor at two terminals voltage;
N--greater than 1 less than 41 natural number.
CN 200810177312 2008-11-14 2008-11-14 Calibration method of low-temperature temperature element Active CN101738271B (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105651420A (en) * 2014-12-04 2016-06-08 沈阳中科奥维科技股份有限公司 Thermometer calibration control method for oil transmission pipelines in petroleum industry
CN105973504A (en) * 2016-05-18 2016-09-28 浙江大学 77K-90K temperature zone thermocouple calibration system and method
CN110361042A (en) * 2019-07-25 2019-10-22 深圳中物兴华科技发展有限公司 A kind of humiture monitoring device automatic gauge calibration method and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105651420A (en) * 2014-12-04 2016-06-08 沈阳中科奥维科技股份有限公司 Thermometer calibration control method for oil transmission pipelines in petroleum industry
CN105973504A (en) * 2016-05-18 2016-09-28 浙江大学 77K-90K temperature zone thermocouple calibration system and method
CN105973504B (en) * 2016-05-18 2018-11-09 浙江大学 A kind of 77K~90K warm areas thermocouple calibration system and method
CN110361042A (en) * 2019-07-25 2019-10-22 深圳中物兴华科技发展有限公司 A kind of humiture monitoring device automatic gauge calibration method and system

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Address after: 214175 No.9 Huicheng Road, Chang'an Street, Huishan District, Wuxi City, Jiangsu Province

Patentee after: Amir Testing Technology Co.,Ltd.

Address before: 100076 No.1 dahongmen Road, Donggaodi south, Fengtai District, Beijing

Patentee before: BEIJING AEROSPACE INSTITUTE FOR METROLOGY AND MEASUREMENT TECHNOLOGY

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