CN200993608Y - High-precision temperature-measuring device - Google Patents
High-precision temperature-measuring device Download PDFInfo
- Publication number
- CN200993608Y CN200993608Y CN 200620162203 CN200620162203U CN200993608Y CN 200993608 Y CN200993608 Y CN 200993608Y CN 200620162203 CN200620162203 CN 200620162203 CN 200620162203 U CN200620162203 U CN 200620162203U CN 200993608 Y CN200993608 Y CN 200993608Y
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- China
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- resistance
- right half
- half arm
- bridge arm
- instrument amplifier
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- Expired - Fee Related
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Abstract
The utility model discloses a high-precision temperature measuring device, which comprises a left half arm and a right half arm. Wherein, the left half arm is composed of a constant resistance R1 and a platinum resistance temperature sensor Rt in series. The right half arm is composed of an isolated follower IC1 and constant resistances R2 and R3. In addition, the left half arm is connected with the right half arm in parallel, which are jointly and electrically connected with a constant power source. The platinum resistance temperature sensor Rt adopts three-wire connecting system. Two lead resistances Rx1 and Rx3 are connected with loops R1 and Rt in series. Another lead resistance Rx2 is connected with an input terminal of a meter amplifier IC2 with high input impedance. Besides, an output terminal of the meter amplifier IC2 is electrically connected with contacts of the constant resistance R2 and R3. The utility model adopts high-stability constant current source to provide electric power for a measuring bridge and isolates electric power for a left and right half bridge, thus fulfilling linear rectification to the platinum resistance and electric bridge and showing higher measuring precision.
Description
Technical field
The utility model relates to a kind of platinum resistance of utilizing and carries out thermometric device.
Background technology
Utilize platinum resistance to carry out temperature survey at present and adopt the unbalanced bridge technology, adopt voltage fed, yet the nonlinear characteristic in the unbalanced bridge that the nonlinearities change between platinum resistance value and the temperature causes, bring certain error to temperature survey, influence measurement result, therefore this electric bridge can not adopt when requiring the high-precision temperature measuring condition.
Summary of the invention
The purpose of this utility model provides a kind of high precision measuring temperature device, and the nonlinear characteristic that it has solved unbalanced bridge effectively has the measuring accuracy advantages of higher.
The technical scheme in the invention for solving the above technical problem is: a kind of high precision measuring temperature device, comprise left half-bridge arm that is composed in series by fixed resistance R1, platinum resistance temperature sensor Rt and the right half-bridge arm that is composed in series by fixed resistance R2, R3, and instrument amplifier, be electrically connected with constant current source after described left half-bridge arm and the parallel connection of right half-bridge arm, the input end of instrument amplifier is electrically connected with the contact of Rt with R1, and the output terminal of instrument amplifier is electrically connected with the contact of R3 with R2.
An isolation follower IC1 connects between said fixing resistance R 2 and the constant current source.
Above-mentioned platinum resistance temperature sensor Rt adopts the three-wire system connection, and two lead resistance Rx1, Rx3 are connected in R1, the Rt loop, and another lead resistance Rx2 inserts the input end of instrument amplifier IC2.
Above-mentioned instrument amplifier IC2 has high input impedance.
The beneficial effects of the utility model are: because constant current source power supply, simultaneously with R1, left half-bridge arm and R3 that Rt forms, the right half-bridge arm that R2 forms is isolated by an isolation follower, make when guaranteeing constant current source the half-bridge arm provides steady current left, keep a left side, the supply voltage of right half-bridge arm equates (Uac=Udc), simultaneously platinum resistance temperature sensor Rt is adopted the three-wire system connection, make two lead resistance Rx1, Rx3 is included in R1 respectively, in the Rt loop, another lead resistance Rx2 inserts the input end of the instrument amplifier with high input impedance, therefore can negligible resistance Rx2 to the influence of output signal, eliminated input lead resistance like this to thermometric influence, make the output of instrument amplifier keep good linear relationship thus, have the high advantage of measuring accuracy simultaneously with the measurement temperature.
Description of drawings
Accompanying drawing 1 is an electrical connection synoptic diagram of the present utility model;
Accompanying drawing 2 is an electrical connection schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail, as accompanying drawing 1, shown in 2, a kind of high precision measuring temperature device, comprise by fixed resistance R1, the left half-bridge arm that platinum resistance temperature sensor Rt is composed in series and by isolating follower IC1, fixed resistance R2, the right half-bridge arm that R3 is composed in series, be electrically connected with constant current source after left side half-bridge arm and the parallel connection of right half-bridge arm, make when guaranteeing constant current source the half-bridge arm provides steady current left, keep the supply voltage of left and right sides half-bridge arm to equate, platinum resistance temperature sensor Rt adopts the three-wire system connection, comprise three lead resistance Rx1, Rx2, Rx3, two lead resistance Rx1 wherein, Rx3 is connected on R1, in the Rt loop, another lead resistance Rx2 inserts the input end of the instrument amplifier IC2 with high input impedance, therefore can negligible resistance Rx2 to the influence of output signal, eliminated input lead resistance like this to thermometric influence, make the output valve of instrument amplifier IC2 keep good linear relationship, the output terminal of instrument amplifier IC2 and fixed resistance R2 with the measurement temperature, the contact of R3 electrically connects.
Claims (4)
1, a kind of high precision measuring temperature device, comprise left half-bridge arm that is composed in series by fixed resistance (R1), platinum resistance temperature sensor (Rt) and the right half-bridge arm that is composed in series by fixed resistance (R2), (R3), an and instrument amplifier (IC2), it is characterized in that being electrically connected with constant current source after described left half-bridge arm and the parallel connection of right half-bridge arm, the input end of instrument amplifier is electrically connected with the contact of (Rt) with (R1), and the output terminal of instrument amplifier is electrically connected with the contact of (R3) with (R2).
2, high precision measuring temperature device according to claim 1 is characterized in that the isolation follower (IC1) of connecting between described fixed resistance (R2) and the constant current source.
3, high precision measuring temperature device according to claim 1, it is characterized in that described platinum resistance temperature sensor (Rt) adopts the three-wire system connection, two lead resistances (Rx1), (Rx3) are connected in (R1), (Rt) loop, and another lead resistance (Rx2) inserts the input end of instrument amplifier (IC2).
4,, it is characterized in that described instrument amplifier (IC2) has high input impedance according to claim 1 or 3 described high precision measuring temperature devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620162203 CN200993608Y (en) | 2006-12-25 | 2006-12-25 | High-precision temperature-measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620162203 CN200993608Y (en) | 2006-12-25 | 2006-12-25 | High-precision temperature-measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200993608Y true CN200993608Y (en) | 2007-12-19 |
Family
ID=38946682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620162203 Expired - Fee Related CN200993608Y (en) | 2006-12-25 | 2006-12-25 | High-precision temperature-measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200993608Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401698A (en) * | 2010-09-17 | 2012-04-04 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN101957243B (en) * | 2009-07-14 | 2012-07-25 | 中国科学院空间科学与应用研究中心 | High-precision temperature measuring device and method |
| CN102613879A (en) * | 2012-01-13 | 2012-08-01 | 浙江绍兴苏泊尔生活电器有限公司 | Electric cooking appliance with high-precision temperature measuring device |
| 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 |
| CN102722976A (en) * | 2012-06-20 | 2012-10-10 | 中国科学院空间科学与应用研究中心 | Temperature-measuring transmission device for space-borne equipment |
| CN102928109A (en) * | 2012-10-25 | 2013-02-13 | 重庆长安汽车股份有限公司 | Signal collecting circuit |
| CN103186108A (en) * | 2011-12-30 | 2013-07-03 | 意法半导体有限公司 | Temperature switch with resistive sensor |
| CN105510654A (en) * | 2015-12-09 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Constant current output circuit for eliminating influence of switch conduction resistance on output current |
| CN105784176A (en) * | 2016-05-25 | 2016-07-20 | 北京先驱威锋技术开发公司 | Temperature measuring system and method based on platinum resistor |
| CN105890793A (en) * | 2016-01-29 | 2016-08-24 | 重庆迪洋仪表有限责任公司 | Three-wire Pt100 platinum resistance temperature measurement circuit |
| CN106092362A (en) * | 2016-08-26 | 2016-11-09 | 江苏远望仪器有限公司 | Three-wire type platinum resistance thermometer sensor, PT100 system for detecting temperature |
| CN108195481A (en) * | 2018-01-26 | 2018-06-22 | 兰州大学 | A kind of strain fermentation temperature measuring equipment and method with self-diagnostic function |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
-
2006
- 2006-12-25 CN CN 200620162203 patent/CN200993608Y/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957243B (en) * | 2009-07-14 | 2012-07-25 | 中国科学院空间科学与应用研究中心 | High-precision temperature measuring device and method |
| CN102401698A (en) * | 2010-09-17 | 2012-04-04 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN102401698B (en) * | 2010-09-17 | 2013-05-22 | 中国科学院海洋研究所 | Measurement system for sea water temperature |
| CN103186108A (en) * | 2011-12-30 | 2013-07-03 | 意法半导体有限公司 | Temperature switch with resistive sensor |
| CN103186108B (en) * | 2011-12-30 | 2016-04-27 | 意法半导体有限公司 | There is the temperature switch of resistance sensor |
| CN102613879A (en) * | 2012-01-13 | 2012-08-01 | 浙江绍兴苏泊尔生活电器有限公司 | Electric cooking appliance with high-precision temperature measuring device |
| 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 |
| CN102722976B (en) * | 2012-06-20 | 2015-03-18 | 中国科学院空间科学与应用研究中心 | Temperature-measuring transmission device for space-borne equipment |
| CN102722976A (en) * | 2012-06-20 | 2012-10-10 | 中国科学院空间科学与应用研究中心 | Temperature-measuring transmission device for space-borne equipment |
| CN102928109A (en) * | 2012-10-25 | 2013-02-13 | 重庆长安汽车股份有限公司 | Signal collecting circuit |
| CN105510654A (en) * | 2015-12-09 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Constant current output circuit for eliminating influence of switch conduction resistance on output current |
| CN105890793A (en) * | 2016-01-29 | 2016-08-24 | 重庆迪洋仪表有限责任公司 | Three-wire Pt100 platinum resistance temperature measurement circuit |
| CN105784176A (en) * | 2016-05-25 | 2016-07-20 | 北京先驱威锋技术开发公司 | Temperature measuring system and method based on platinum resistor |
| CN105784176B (en) * | 2016-05-25 | 2018-06-12 | 北京先驱威锋技术开发公司 | A kind of temperature measurement system and measuring method based on platinum resistance |
| CN106092362A (en) * | 2016-08-26 | 2016-11-09 | 江苏远望仪器有限公司 | Three-wire type platinum resistance thermometer sensor, PT100 system for detecting temperature |
| CN108195481A (en) * | 2018-01-26 | 2018-06-22 | 兰州大学 | A kind of strain fermentation temperature measuring equipment and method with self-diagnostic function |
| CN108195481B (en) * | 2018-01-26 | 2024-03-08 | 兰州大学 | Strain fermentation temperature measuring device with self-diagnosis function and strain fermentation temperature measuring method |
| CN110220606A (en) * | 2019-06-24 | 2019-09-10 | 宁波华仪宁创智能科技有限公司 | Temperature measuring equipment and method with calibration function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |