CN1419111A - Method for metering special temp. value - Google Patents
Method for metering special temp. value Download PDFInfo
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- CN1419111A CN1419111A CN 02139856 CN02139856A CN1419111A CN 1419111 A CN1419111 A CN 1419111A CN 02139856 CN02139856 CN 02139856 CN 02139856 A CN02139856 A CN 02139856A CN 1419111 A CN1419111 A CN 1419111A
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Abstract
The invention is a method of measuring specific temperature value using the precision resistor R1 and R2, their resistance values known, and the resistor RA and RB made of alloy material to compose a Wheatstone bridge, RA and RB as the first proportion arm and R1 and R2 as the second one; the power-supply signal is added between two parallel proportional arms and also a potential comparer is linked with the middle points of two proportional arms; the coefficient of RA resistance value with the temperature change is a, that of RB's is b and a>b; when the comparer detects the potential of RB and R2 is equal, it outputs a switching signal, and the sum of the temperature-changing value delta T and the normal temperature is the present specific temperature value.
Description
Technical field
The invention belongs to a kind of method of measuring particular temperature value, particularly utilize the temperature variant characteristic measurement method of temperature of resistance alloys value.
Technical background
Traditional thermometric particularly adopts thermopair, infrared sensitization, thermosensitive device etc. usually to the measurement of higher temperature environment, and the response time of its measurement is long, generally reaches a second level; Measurement point has limitation, and error is big, and is difficult to accomplish the potential isolation with signal output system; Particularly under the situation of vibration such as track traffic and wind-force heat radiation, thermopair and infrared sensitive probe are difficult to accomplish the reliability and the accuracy of measurement point.
Summary of the invention
Purpose of the present invention is exactly the deficiency that exists at existing temperature sensing means, for the temperature protection control technology provides a kind of method of measuring particular temperature value fast, accurately, reliably.
The relation that it rises with temperature by the direct resistance of the alloy material resistance of reflection temperature variation accurately reflects the actual temperature of resistance alloys with resistance alloys and external bridge circuit of known resistance formation, and response speed reaches the microsecond level.
Select two resistor R A, RB that are made of alloy material, in certain temperature range, the temperature variant coefficient of this resistor R A resistance is a, and the temperature variant coefficient of the resistance of resistor R B is b; The temperature variant coefficient of described resistor R B resistance is greater than the temperature variant coefficient of resistor R A resistance, and promptly b is greater than a; Precision resistor R1, R2 with known resistance constitute a Wheatstone bridge with resistor R A, RB, and wherein resistor R A, RB are the first Comparative Examples arm, and resistor R 1, R2 are the second Comparative Examples arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections; Also comprise a potential comparator 1 that is connected in first, second ratio arms intermediate point, (as 20 ℃) at normal temperatures, the resistance of resistor R A, RB is known as RA, RB respectively; Current potential on the resistor R B is less than the current potential on the resistor R 2, and when making temperature change value be Δ T, the current potential on the resistor R B equates with current potential on the resistor R 2; Described potential comparator 1 detects the current potential switching signal of output when current potential on the resistor R 2 equates on the resistor R B, and this moment, temperature change value Δ T and normal temperature sum were exactly the particular temperature value of presetting.
Alloy material can adopt Cr20Ni40, and its resistance change rate is 3% per 100 ℃, and Cr20Ni80, its resistance change rate are 1% per 100 ℃.
Description of drawings
Fig. 1 is principle of the invention figure.
Embodiment
As shown in Figure 1, select two resistor R A, RB that are made of alloy material, in certain temperature range, the temperature variant coefficient of this resistor R A resistance is a, and the temperature variant coefficient of the resistance of resistor R B is b; The temperature variant coefficient of described resistor R B resistance is greater than the temperature variant coefficient of resistor R A resistance, and promptly b is greater than a; Precision resistor R1, R2 with known resistance constitute a Wheatstone bridge with resistor R A, RB, and wherein resistor R A, RB are the first Comparative Examples arm, and resistor R 1, R2 are the second Comparative Examples arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections; Also comprise a potential comparator 1 that is connected in first, second ratio arms intermediate point, (as 20 ℃) at normal temperatures, the resistance of resistor R A, RB is respectively RA, RB; Current potential on the resistor R B is less than the current potential on the R2, and when making temperature change value be Δ T, the current potential on the resistor R B equates with current potential on the resistor R 2; Described potential comparator 1 detects the current potential switching signal of output when current potential on the resistor R 2 equates on the resistor R B, and this moment, temperature change value Δ T and normal temperature sum were exactly the particular temperature value of presetting.
In certain temperature range, when variation of ambient temperature Δ T, the resistance value RA ' of resistor R A, RB, RB ' satisfy respectively:
RA′＝RA+ΔTa
RB′＝RB+ΔTb
Wherein RA, RB are the known at normal temperatures resistance value of resistor R A, RB.
The resistance of precision resistor R1, R2 is known and can ignore the change in resistance that it produces with variation of ambient temperature.Because b is greater than a, the collocation by to the resistance value of resistor R 1, R2, RA, RB makes that the pressure drop on the resistor R B is less than the pressure drop on the resistor R 2 when environment temperature is lower than set temperature value; When environment temperature was greater than or equal to set temperature value, the pressure drop on the resistor R B was more than or equal to the pressure drop on the R2; Potential comparator 1 detects this variation simultaneously, exports a switching signal, and the action of this switching signal promptly is the moment that environment temperature reaches setting value constantly.
Have following equation to set up at operating point:
RA′/RB′＝R1/R2
Wherein:
RA′＝RA+ΔTa
RB '=RB+ Δ Tb, therefore following equation is set up:
(RA+ΔTa)/(RB+ΔTb)＝R1/R2
So:
ΔT＝(R2RA-R1RB)/(bR1-aR2)
Δ T just becomes a definite numerical value like this, and temperature change value Δ T and normal temperature sum are exactly the particular temperature value of presetting.
Adopting alloy material Cr20Ni40 (nickel-chrome), its resistance change rate a as resistor R B is 3% per 100 ℃, and resistor R A adopts alloy material Cr20Ni80 (nickel-chrome), and its resistance change rate b is 1% per 100 ℃.The resistance of getting resistor R1, R2 under the normal temperature is R1=103.4, R2=99.93, RA=0.0442, RB=0.0385, and then temperature change value Δ T=600, temperature change value Δ T and normal temperature sum are 620 ℃.
The resistance of and for example getting resistor R1, R2 under the normal temperature is R1=102.79, R2=97.21, RA=0.0445, RB=0.0377, and then temperature change value Δ T=620, temperature change value Δ T and normal temperature sum are 640 ℃.Above resistance value unit is ohm.
Overtemperature prote of making according to above method or monitoring device have the response time soon, advantage accurately and reliably.
Claims (3)
1, a kind of method of measuring particular temperature value, it is characterized in that precision resistor (R1), resistor (R2) with known resistance constitute a Wheatstone bridge with resistor (RA), the resistor (RB) that alloy material constitutes, wherein resistor (RA), resistor (RB) are the first Comparative Examples arm, and resistor (R1), resistor (R2) are the second Comparative Examples arm; Power supply signal is added between the first couple, the second Comparative Examples arm of two parallel connections, also comprises a potential comparator (1) that is connected in first, second ratio arms intermediate point; Described resistor (RA) resistance temperature variant coefficient in certain temperature range is a, and the temperature variant coefficient of resistance of described resistor (RB) is b; The temperature variant coefficient of described resistor (RB) resistance is greater than the temperature variant coefficient of resistor (RA) resistance, and promptly b is greater than a; Described potential comparator (1) detects the current potential switching signal of output when current potential on the resistor (R2) equates on the resistor (RB), and this moment, temperature change value Δ T and normal temperature sum were exactly the particular temperature value of presetting.
2, a kind of method of measuring particular temperature value as claimed in claim 1 is characterized in that described resistor (RA), resistor (RB) are the resistors that adopts the nickel-chrome material to constitute.
3, a kind of method of measuring particular temperature value as claimed in claim 1 is characterized in that it is to adopt Cr20Ni40 alloy material resistor that described resistor (RA) adopts Cr20Ni80 alloy material resistor, resistor (RB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021398569A CN1188676C (en) | 2002-12-17 | 2002-12-17 | Method for metering special temp. value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021398569A CN1188676C (en) | 2002-12-17 | 2002-12-17 | Method for metering special temp. value |
Publications (2)
| Publication Number | Publication Date |
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| CN1419111A true CN1419111A (en) | 2003-05-21 |
| CN1188676C CN1188676C (en) | 2005-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021398569A Expired - Lifetime CN1188676C (en) | 2002-12-17 | 2002-12-17 | Method for metering special temp. value |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329295B (en) * | 2007-06-22 | 2011-05-18 | 中芯国际集成电路制造(上海)有限公司 | Method for measuring resistance temperature coefficient |
| CN101718595B (en) * | 2009-12-15 | 2011-07-20 | 深圳和而泰智能控制股份有限公司 | Method and device for measuring temperature based on resistive temperature sensor |
| CN105987766A (en) * | 2015-01-30 | 2016-10-05 | 中芯国际集成电路制造(上海)有限公司 | Temperature measurement method and temperature measurement device |
| CN106352999A (en) * | 2015-07-15 | 2017-01-25 | 中芯国际集成电路制造(上海)有限公司 | Temperature measuring method and temperature measuring structure |
-
2002
- 2002-12-17 CN CNB021398569A patent/CN1188676C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101329295B (en) * | 2007-06-22 | 2011-05-18 | 中芯国际集成电路制造(上海)有限公司 | Method for measuring resistance temperature coefficient |
| CN101718595B (en) * | 2009-12-15 | 2011-07-20 | 深圳和而泰智能控制股份有限公司 | Method and device for measuring temperature based on resistive temperature sensor |
| CN105987766A (en) * | 2015-01-30 | 2016-10-05 | 中芯国际集成电路制造(上海)有限公司 | Temperature measurement method and temperature measurement device |
| CN106352999A (en) * | 2015-07-15 | 2017-01-25 | 中芯国际集成电路制造(上海)有限公司 | Temperature measuring method and temperature measuring structure |
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| Publication number | Publication date |
|---|---|
| CN1188676C (en) | 2005-02-09 |
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Owner name: SOUTH ZHUZHOU ELECTRIC LOCOMOTIVE INSTITUTE CO., L Free format text: FORMER NAME OR ADDRESS: ZHUZHOU ELECTRIC LOCOMOTIVE INSTITUTE |
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Address after: Tian Xin, Zhuzhou, Hunan Patentee after: CSR ZHUZHOU ELECTRIC LOCOMOTIVE RESEARCH INSTITUTE Co.,Ltd. Address before: Tian Xin, Zhuzhou, Hunan Patentee before: Zhuzhou Electric Locomotive Research Institute |
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Granted publication date: 20050209 |
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