CN2929679Y - Temperature measurer - Google Patents
Temperature measurer Download PDFInfo
- Publication number
- CN2929679Y CN2929679Y CN 200620120596 CN200620120596U CN2929679Y CN 2929679 Y CN2929679 Y CN 2929679Y CN 200620120596 CN200620120596 CN 200620120596 CN 200620120596 U CN200620120596 U CN 200620120596U CN 2929679 Y CN2929679 Y CN 2929679Y
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- CN
- China
- Prior art keywords
- resistance
- temperature
- amplifier
- fixed resistance
- current source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model relates to the temperature measuring technique in industrial control, in particular to a temperature measuring apparatus using a platinum resistance as a probe. The apparatus comprises a temperature probe, a fixed resistance, an amplifier and a constant-current source, wherein the current of the temperature probe RT and the fixed resistance R1 are respectively powered by a double-circuit constant-current source I, a voltage amplifier AV is connected the two ends of the temperature probe RT and the fixed resistance R1. The utility model can fully utilize the effective measuring space of the platinum resistance to measure, thereby realizing the linear measurement of the temperature, and the data measured can be output as a high measuring accuracy display without any other calculating processes.
Description
Technical field
The utility model relates to temperature measurement technology in the Industry Control, is specifically related to make of platinum resistance a kind of temperature measuring equipment of probe.
Background technology
In Industry Control, temperature is an important controlled variable, temperature survey being required accurate place, generally uses platinum (Pt) resistance to do temp probe, and its temperature-measuring range is generally at-200～650 ℃, and temperature deviation is at ± 0.5 ℃.So the Pt resistive performance is stable, measuring repeatability is good, precision height, good linearity.The Pt electric resistance measuring apparatus generally adopts full bridge measurement and single arm measurement circuit.The full bridge measurement circuit generally adopts the source of stable pressure power supply, is characterized in that measurement range is big, but its output is linear bad, also needs to dispose the complex calculations circuit and just can reach higher measuring accuracy.Single arm measurement adopts constant current source to give the power supply of Pt resistance, characteristics are that circuit is fairly simple, but because the basic resistance (0 ℃ of resistance value) of Pt resistance is very big in the shared ratio of measuring resistance, in the time of 250 ℃, also account for 50%, can not make full use of the effective measurement space of Pt resistance, its measurement range is little, and measuring accuracy is not high.
Technology contents
The purpose of this utility model provides and can realize linear output, a kind of temperature measuring equipment that measuring accuracy is high in bigger temperature range.
The utility model adopts following technical scheme:
Form by temp probe, fixed resistance, amplifier and constant current source, use two-way constant current source (I) respectively, be connected voltage amplifier (AV) with fixed resistance (R1) two ends at temp probe (RT) to temp probe (RT) and fixed resistance (R1) power supply.
Described two constant current sources (I) output equates.
Resistance when described fixed resistance (R1) resistance is 0 ℃ of temp probe (RT).
Amplifier (AV) is amplified in the potential difference (PD) of two arms, obtains the voltage corresponding with temperature linearity.
The utility model can make full use of the effective measurement space of Pt resistance and measure, and realizes the linear measurement of temperature, does not need other computings after the measurement, just can be used as output functions such as high measurement accuracy demonstration.
Description of drawings
Fig. 1 is the utility model circuit diagram.
Fig. 2 is the utility model embodiment circuit diagram.
Embodiment
The utility model is made up of temp probe, fixed resistance, amplifier and constant current source, the constant current source I that equates with two-way output powers to temp probe RT (treating test arm) and fixed resistance R1 (relatively arm) respectively, is connected with voltage amplifier at temp probe RT and fixed resistance R1 two ends.Resistance value when the fixed resistance resistance is 0 ℃ of temp probe RT, amplifier AV is amplified in the potential difference (PD) of two arms, obtains the voltage corresponding with temperature linearity.
Two constant current sources can be constant-current circuits, also can be constant-current source devices, and output current requires to equate that electric current can be chosen 0.5mA, 0.8mA or 1mA electric current.Platinum resistance is selected products such as Xian Instrument Factory, the dark new sunshine Electronics Co., Ltd. in Shenzhen for use, usually structure is to go up attached one deck platinum film at pedestal (being generally stupalith), adopts the way of cutting, obtains different resistances, general general resistance is 100 ohm, or 1000 ohm.Voltage amplifier is the operational amplifier built-up circuit, can choose according to different demands.
The resistance of the utility model temp probe varies with temperature linear change, owing to be the constant current power supply, its voltage output changes with temperature linearity; Fixed resistance is selected the little precision resistance of temperature coefficient for use, and its resistance value is selected 0 ℃ of resistance value of temp probe, and fixed resistance resistance varies with temperature very little, can think that it is a fixed value, so its voltage is output as fixed voltage value.Be amplified in the potential difference (PD) of two arms, obtain the voltage corresponding with temperature linearity.
The utility model measuring principle and output voltage and temperature relation are:
V
OUT＝I×(R
t-R
0)×Av (1)
In the formula: R
tBe the resistance value of Pt resistance temperature when being t;
R
0Be the resistance value of Pt resistance 0 ℃ the time;
I is the constant current source output current;
Av is an Amplifier Gain.
And Pt resistance characteristic equation is:
R
t＝R
0×(1+A×t) (2)
In the formula: R
tBe the resistance value of Pt resistance temperature when being t;
R
0Be the resistance value of Pt resistance 0 ℃ the time;
The A=Pt temperature-coefficient of electrical resistance;
T is a real time temperature.
Obtaining in (2) substitution (1) formula
V
OUT＝I×Av×A×t (3)
In the formula: t is a temperature;
A is the Pt temperature-coefficient of electrical resistance
I is a supply current;
Av is for measuring enlargement factor.
By (3) formula as can be seen, I and Av are determined that by design when design was determined, I and Av were definite value, and A is the temp probe coefficient.Output valve is only relevant with temperature, and linear fine.
Accompanying drawing 2 is another embodiment of the present utility model, and U1, R2 and R3 constitute a constant-current source circuit provides steady current I1 to fixed resistance R1; U2, R3 and R4 constitute another constant-current source circuit provides steady current I2 to fixed resistance Rt; , wherein Rt adopts Pt100 resistance, R1=100 ohm; R2=R4; R3=R5.Two constant-current source circuits are identical, the electric current approximately equal of output, i.e. I1=I2; U3 and R6 constitute differential amplifier, and the potential difference (PD) of Rt and R1 is amplified, and exporting its differential signal is the linear relationship signal of temperature.
Claims (4)
1, a kind of temperature measuring equipment, form by temp probe, fixed resistance, amplifier and constant current source, it is characterized in that: use two-way constant current source (I) to temp probe (RT) and fixed resistance (R1) power supply respectively, be connected voltage amplifier (AV) with fixed resistance (R1) two ends at temp probe (RT).
2, a kind of temperature measuring equipment according to claim 1, described two constant current sources (I) output equates.
Resistance when 3, a kind of temperature measuring equipment according to claim 1, described fixed resistance (R1) resistance are 0 ℃ of temp probe (RT).
4, a kind of temperature measuring equipment according to claim 1, amplifier (AV) is amplified in the potential difference (PD) of two arms, obtains the voltage corresponding with temperature linearity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120596 CN2929679Y (en) | 2006-06-23 | 2006-06-23 | Temperature measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120596 CN2929679Y (en) | 2006-06-23 | 2006-06-23 | Temperature measurer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2929679Y true CN2929679Y (en) | 2007-08-01 |
Family
ID=38308061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620120596 Expired - Lifetime CN2929679Y (en) | 2006-06-23 | 2006-06-23 | Temperature measurer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2929679Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793569A (en) * | 2010-03-01 | 2010-08-04 | 中国电子科技集团公司第二十六研究所 | Method for measuring temperature of sensitive devices of quartz micro-machined gyroscopes and temperature compensation circuit |
| CN102661816A (en) * | 2012-05-21 | 2012-09-12 | 中国科学院电工研究所 | Liquid nitrogen temperature continuously and automatically measuring device |
| CN102944323A (en) * | 2012-11-18 | 2013-02-27 | 中国人民解放军63655部队 | Temperature fluctuation instrument based on true root-mean-square converter |
| CN103017928A (en) * | 2012-12-04 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply temperature detection circuit |
| CN103411699A (en) * | 2013-07-16 | 2013-11-27 | 中国计量科学研究院 | High-precision temperature measuring device |
| CN103884443A (en) * | 2014-04-17 | 2014-06-25 | 马永青 | Temperature transmitter |
| CN105510380A (en) * | 2015-12-02 | 2016-04-20 | 上海仪电科学仪器股份有限公司 | Temperature titration device |
| CN105738004A (en) * | 2014-12-10 | 2016-07-06 | 中车大连电力牵引研发中心有限公司 | Temperature measurement method and circuit |
| CN107560762A (en) * | 2017-09-06 | 2018-01-09 | 阳光电源股份有限公司 | A kind of PT100 resistance temperature measurements method and system |
-
2006
- 2006-06-23 CN CN 200620120596 patent/CN2929679Y/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793569A (en) * | 2010-03-01 | 2010-08-04 | 中国电子科技集团公司第二十六研究所 | Method for measuring temperature of sensitive devices of quartz micro-machined gyroscopes and temperature compensation circuit |
| CN102661816A (en) * | 2012-05-21 | 2012-09-12 | 中国科学院电工研究所 | Liquid nitrogen temperature continuously and automatically measuring device |
| CN102944323A (en) * | 2012-11-18 | 2013-02-27 | 中国人民解放军63655部队 | Temperature fluctuation instrument based on true root-mean-square converter |
| CN102944323B (en) * | 2012-11-18 | 2015-11-25 | 中国人民解放军63655部队 | A kind of micro-temperature sensor based on true Root Mean square Converter |
| CN103017928A (en) * | 2012-12-04 | 2013-04-03 | 杭州成功超声电源技术有限公司 | Ultrasonic power supply temperature detection circuit |
| CN103411699A (en) * | 2013-07-16 | 2013-11-27 | 中国计量科学研究院 | High-precision temperature measuring device |
| CN103411699B (en) * | 2013-07-16 | 2016-07-06 | 中国计量科学研究院 | A kind of high precision measuring temperature instrument |
| CN103884443A (en) * | 2014-04-17 | 2014-06-25 | 马永青 | Temperature transmitter |
| CN105738004A (en) * | 2014-12-10 | 2016-07-06 | 中车大连电力牵引研发中心有限公司 | Temperature measurement method and circuit |
| CN105510380A (en) * | 2015-12-02 | 2016-04-20 | 上海仪电科学仪器股份有限公司 | Temperature titration device |
| CN107560762A (en) * | 2017-09-06 | 2018-01-09 | 阳光电源股份有限公司 | A kind of PT100 resistance temperature measurements method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070801 |
|
| EXPY | Termination of patent right or utility model |