CN104155028A - Device for improving temperature measurement accuracy in complex environment - Google Patents
Device for improving temperature measurement accuracy in complex environment Download PDFInfo
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- CN104155028A CN104155028A CN201410418362.2A CN201410418362A CN104155028A CN 104155028 A CN104155028 A CN 104155028A CN 201410418362 A CN201410418362 A CN 201410418362A CN 104155028 A CN104155028 A CN 104155028A
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- resistance
- differential amplifier
- complex environment
- temperature measurement
- temperature
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Abstract
The invention relates to temperature measurement technologies and discloses a device for improving the temperature measurement accuracy in complex environment. The antijamming capability is improved, so that temperature data obtained by measurement have higher reliability. A core assembly composed of a twisted pair, an equal-arm bridge and a differential amplifier is adopted, common-mode interference in a signal pickup path is reduced, the equal-arm bridge unbalance amount, caused by temperature changes, of a thermistor is fed into the differential amplifier in a voltage mode, and finally the differential amplifier outputs signals to be provided for an analog-to-digital conversion circuit to carry out voltage sampling or other subsequent processing. The device is applicable to temperature measurement in the complex environment.
Description
Technical field
The present invention relates to temperature measurement technology, particularly a kind of device that improves temperature survey accuracy in complex environment.
Background technology
In order to grasp the temperature of heat generating components in liquid crystal module product, to it is control effectively, can be operated in normal temperature range, just need to take corresponding means, obtain temperature value accurately by certain way, and offer rear end control section and complete temperature adjusting function.Especially in engineering application, external electromagnetic environment, all relative complex of mounted inside cabling, can be subject to various interference undoubtedly in temperature survey process.
Therefore, the application is necessary to propose a kind of device that improves temperature survey accuracy in complex environment, improves antijamming capability, makes to measure the temperature data obtaining and possesses higher confidence level.
Summary of the invention
Technical matters to be solved by this invention is: propose a kind of device that improves temperature survey accuracy in complex environment, improve antijamming capability, make to measure the temperature data obtaining and possess higher confidence level.
The present invention solves the problems of the technologies described above adopted technical scheme:
A device that improves temperature survey accuracy in complex environment, comprising:
Equal arm bridge circuit and differential amplifier; A wherein brachium pontis of described equal arm bridge circuit is thermistor, the output terminal of this equiarm bridge diagram by twisted-pair feeder to being connected to the input end of differential amplifier.
Further, described equal arm bridge circuit comprises: respectively as the first resistance R 1, the second resistance R 2, the 3rd resistance R t, the 4th resistance R 4 of a brachium pontis; Wherein the 3rd resistance R t is thermistor; The node of the first resistance R 1 and the second resistance R 2 connects power supply; The node ground connection of the 3rd resistance R t and the 4th resistance R 4; The node of the node of the first resistance R 1 and the 3rd resistance R t and the second resistance R 2 and the 4th resistance R 4 is as two output nodes, described two output nodes by twisted-pair feeder to being connected to in-phase input end and the inverting input of differential amplifier.
The invention has the beneficial effects as follows: adopt twisted-pair feeder to send into differential amplifier to the form of the equal arm bridge amount of unbalance voltage that thermistor is brought due to temperature variation, even if existing, disturbs transmission path, and because the interference on two transmission lines is also that amplitude, phase place are identical, make differential amplifier still can accurately identify the voltage relevant to temperature variation, reduce the common mode interference in picking up signal process, thereby improve temperature survey accuracy in complex environment.
Brief description of the drawings
Fig. 1 is the device schematic diagram of temperature survey accuracy in the raising complex environment in the embodiment of the present invention.
Embodiment
The present invention is intended to propose a kind of device that improves temperature survey accuracy in complex environment, improves antijamming capability, makes to measure the temperature data obtaining and possesses higher confidence level.In the present invention, the core component that adopts twisted-pair feeder to form, equal arm bridge and differential amplifier, reduce the common mode interference in picking up signal path, the form of the equal arm bridge amount of unbalance voltage that thermistor is brought due to temperature variation is sent into differential amplifier, finally offers mould/number conversion circuit by differential amplifier output signal and carries out the subsequent treatment such as voltage sample.
Below in conjunction with drawings and Examples, the solution of the present invention is further described:
As shown in Figure 1, the device in this example comprises equal arm bridge circuit and differential amplifier; Wherein equal arm bridge circuit comprises: respectively as the first resistance R 1, the second resistance R 2, the 3rd resistance R t, the 4th resistance R 4 of a brachium pontis; Wherein the 3rd resistance R t is thermistor; The node of the first resistance R 1 and the second resistance R 2 connects power supply; The node ground connection of the 3rd resistance R t and the 4th resistance R 4; The node of the node of the first resistance R 1 and the 3rd resistance R t and the second resistance R 2 and the 4th resistance R 4 is as two output nodes, described two output nodes by twisted-pair feeder to being connected to in-phase input end and the inverting input of differential amplifier.
In the specific implementation, the 3rd resistance R t be fixed near detected part and carry out and the insulation processing of other metallic conductor; Adopt again twisted-pair feeder to two output nodes being connected to in-phase input end and the inverting input of differential amplifier; In addition, also can adopt in this application other thermally sensitive similar device to carry out place of thermistors.
The principle of work of said apparatus is:
In the time of equal arm bridge balance, because each brachium pontis resistance of electric bridge is identical, the output voltage U 12=U1-U2=0 of electric bridge.When the temperature of detected part changes while causing Rt resistance to change, brachium pontis is unbalance, has produced the output voltage U 12 with Rt change in resistance, and U12 ≠ 0.
If do not use twisted-pair feeder mode to connect, in the time of short-distance transmission, the external interference that this measuring circuit is subject to is less, also little on the impact of rear end testing result.And in the time having compared with strong electromagnetic and longer cabling in liquid crystal module product thermometric, especially engineering field, not having the right connecting line of twisted-pair feeder will make the signal that signal end for process receives disturb increase, the detection on signal is brought impact by this.Due to the right use of twisted-pair feeder, disturb even if transmission path exists in this application, the interference on two transmission lines is also amplitude, phase place identical (Δ U), and differential amplifier still can accurately be identified the voltage U relevant to temperature variation 12.
Input signal Ud=(U1+ Δ U)-(U2+ Δ U)=U1-U2=U12 that, differential amplifier receives
For this class device of differential amplifier, because it has the characteristic of amplifying two input terminal voltage differences, therefore, the voltage U o after differential amplifier, can accurately reflect the variation of thermistor temp.Thereby improve the reliability in temperature data acquisition path, for rear end sampling, detection provide reliable, effective foundation.
Claims (2)
1. a device that improves temperature survey accuracy in complex environment, is characterized in that, comprising:
Equal arm bridge circuit and differential amplifier; A wherein brachium pontis of described equal arm bridge circuit is thermistor, the output terminal of this equiarm bridge diagram by twisted-pair feeder to being connected to the input end of differential amplifier.
2. a kind of device that improves temperature survey accuracy in complex environment as claimed in claim 1, it is characterized in that, described equal arm bridge circuit comprises: respectively as the first resistance (R1), the second resistance (R2), the 3rd resistance (Rt), the 4th resistance (R4) of a brachium pontis; Wherein the 3rd resistance (Rt) is thermistor; The first resistance (R1) connects power supply with the node of the second resistance (R2); The node ground connection of the 3rd resistance (Rt) and the 4th resistance (R4); The node of the first resistance (R1) and the 3rd resistance (Rt) and the second resistance (R2) with the node of the 4th resistance (R4) as two output nodes, described two output nodes by twisted-pair feeder to being connected to in-phase input end and the inverting input of differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410418362.2A CN104155028A (en) | 2014-08-22 | 2014-08-22 | Device for improving temperature measurement accuracy in complex environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410418362.2A CN104155028A (en) | 2014-08-22 | 2014-08-22 | Device for improving temperature measurement accuracy in complex environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104155028A true CN104155028A (en) | 2014-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410418362.2A Pending CN104155028A (en) | 2014-08-22 | 2014-08-22 | Device for improving temperature measurement accuracy in complex environment |
Country Status (1)
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| CN (1) | CN104155028A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229536A (en) * | 2020-06-02 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Method for measuring temperature of terminal block of electric energy meter |
Citations (5)
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|---|---|---|---|---|
| NL1000486C2 (en) * | 1995-06-02 | 1996-12-03 | Nederland Ptt | Fork circuit for twisted pair transmission line |
| CN101201368A (en) * | 2007-12-21 | 2008-06-18 | 中国计量科学研究院 | Wide band Kelvin double bridge as well as measurement method, autonomous system as well as method and application |
| CN102225390A (en) * | 2011-03-29 | 2011-10-26 | 上海兴全电力技术有限公司 | Full-automatic ultrahigh-power ultrasonic anti-scaling and de-scaling device |
| CN103213904A (en) * | 2012-01-20 | 2013-07-24 | 宝山钢铁股份有限公司 | Apparatus for detecting dangerous section of object taking part of hoisting machine |
| CN103528710A (en) * | 2013-10-30 | 2014-01-22 | 安徽英特电子有限公司 | Perfusate temperature detector |
-
2014
- 2014-08-22 CN CN201410418362.2A patent/CN104155028A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1000486C2 (en) * | 1995-06-02 | 1996-12-03 | Nederland Ptt | Fork circuit for twisted pair transmission line |
| CN101201368A (en) * | 2007-12-21 | 2008-06-18 | 中国计量科学研究院 | Wide band Kelvin double bridge as well as measurement method, autonomous system as well as method and application |
| CN102225390A (en) * | 2011-03-29 | 2011-10-26 | 上海兴全电力技术有限公司 | Full-automatic ultrahigh-power ultrasonic anti-scaling and de-scaling device |
| CN103213904A (en) * | 2012-01-20 | 2013-07-24 | 宝山钢铁股份有限公司 | Apparatus for detecting dangerous section of object taking part of hoisting machine |
| CN103528710A (en) * | 2013-10-30 | 2014-01-22 | 安徽英特电子有限公司 | Perfusate temperature detector |
Non-Patent Citations (1)
| Title |
|---|
| 郑华芳: "同轴小功率标准指示器", 《宇航计测技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229536A (en) * | 2020-06-02 | 2021-01-15 | 青岛鼎信通讯股份有限公司 | Method for measuring temperature of terminal block of electric energy meter |
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Application publication date: 20141119 |
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