CN203422168U - Temperature difference detector - Google Patents

Temperature difference detector Download PDF

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Publication number
CN203422168U
CN203422168U CN201320550538.0U CN201320550538U CN203422168U CN 203422168 U CN203422168 U CN 203422168U CN 201320550538 U CN201320550538 U CN 201320550538U CN 203422168 U CN203422168 U CN 203422168U
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CN
China
Prior art keywords
module
resistance
electric bridge
temperature difference
signal amplification
Prior art date
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Withdrawn - After Issue
Application number
CN201320550538.0U
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Chinese (zh)
Inventor
王庆河
彭公华
李晓
房英翠
王兵
戴兴中
王庆山
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Jinan Iron and Steel Group Co Ltd
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Jinan Iron and Steel Group Co Ltd
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Priority to CN201320550538.0U priority Critical patent/CN203422168U/en
Application granted granted Critical
Publication of CN203422168U publication Critical patent/CN203422168U/en
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Abstract

The utility model discloses a temperature difference detector, comprising a detection electric bridge, a signal amplification module, a sampling and holding module, a digital-analog conversion module, an operation and logic control module, a man-machine interface module and a communication module. The output terminal of the detection electric bridge is connected with the input terminal of the signal amplification module; the output terminal of the signal amplification module is connected with the input terminal of the sampling and holding module; and the output terminal of the sampling and holding module, the digital-analog conversion module and the operation and logic control module are connected in sequence; the operation and logic control module is connected with the man-machine interface module and the communication module; the operation and logic control module is connected with the detection electric bridge, the signal amplification module and the sampling and holding module; the temperature difference detector can be used for measuring large temperature difference and minimal temperature difference, the measuring range can be automatically switched or switched by hand operation, verification is easy, and the temperature difference detector can also be used for detecting the temperature of one point to be detected.

Description

Temperature difference detector
Technical field
The present invention relates to monitoring equipment technical field, particularly a kind of high-precision temperature difference detector for wide range measure.
Background technology
Differential temperature survey is the deviation situation that detects the temperature between two different measured points.Conventional differential temperature survey is general adopt two kinds of modes, mode one be adopt two independently temperature sensor detect respectively the temperature of two measured points, calculate the difference of two temperature as temperature difference data; Mode two is the thermocouple sensor series connection that adopt two identical graduations, and every thermocouple sensor detects a temperature spot, according to the potential calculation temperature difference data of two series connection thermocouple sensor outputs.All there is the not high problem of differential temperature survey accuracy in two kinds of metering systems, mode one is lower because of temperature detection accuracy, and the temperature difference the data precision after is as calculated poorer; Mode two be because the accuracy in detection of thermocouple sensor own is not high, linear poor etc., cause the temperature difference data poor accuracy recording.Therefore above two kinds of modes are better for the larger application scenario effect of the temperature difference, but more maybe can not measure in the less application scenario error of the temperature difference.
Conventional temperature checking method has contact type measurement and two kinds of modes of non-contact measurement, and wherein the precision of contact type measurement is the highest.In contact type measurement, commonly use 3 types of sensors such as thermal resistance, thermopair, thermistor.Wherein, thermal resistance is generally used for high precision, middle low-temperature measurement field, and thermopair is generally used for high temperature measurement field, and thermistor is generally used for the fields of measurement of low precision.The accuracy of measurement of thermal resistance is the highest, the linearity is best.
Summary of the invention
Object of the present invention is exactly the problems referred to above that exist for solving prior art, and a kind of temperature difference detector is provided; Differential temperature survey precision is high, can for the large temperature difference and small temperature difference, measure, manually or automatically switching range simultaneously; Be easy to verification, can detect measured point temperature simultaneously.
The technical scheme of technical solution problem of the present invention is:
A detector, comprises and detects electric bridge, signal amplification module, sampling maintenance module, analog-to-digital conversion module, computing and Logic control module, human-machine interface module, communication module; Described detection electric bridge output terminal is connected with signal amplification module input end, signal amplification module output terminal keeps module input to be connected with sampling, sampling keeps module output terminal, analog-to-digital conversion module, computing and Logic control module to connect successively, described computing and Logic control module are connected with human-machine interface module, communication module respectively, and computing simultaneously and Logic control module keep module to be connected with detection electric bridge, signal amplification module, sampling respectively.
Described computing and Logic control module are used for: a. controls as required and detects electric bridge, signal amplification module, sampling maintenance module duty separately; B. gather the result data of analog-to-digital conversion module, and calculate temperature and the temperature difference data of two measured points; C. control human-machine interface module and show information, receive input data or the instruction of human-machine interface module, and press command request work; D. communication control module and external unit carry out communication, send data, obtain instruction, and press and press command request work;
Described signal amplification module is for amplifying detecting the output signal U of electric bridge;
Described sampling keeps module for signal amplification module output signal V is sampled and kept;
Described analog-to-digital conversion module comprises AD conversion element and auxiliary circuit, completes the analog-to-digital conversion to signal.
Described detection electric bridge comprises divider resistance I, divider resistance II, mode of operation analog switch, thermal resistance sensor RtA, thermal resistance sensor RtB, reference resistance III, electric resistance partial pressure resistance I wherein, one end of divider resistance II is connected with power input E respectively, the divider resistance I other end by mode of operation analog switch K respectively with reference resistance III, thermal resistance sensor RtA connects, while divider resistance I, mode of operation analog switch K is connected with one end of output terminal respectively, the other end of divider resistance II, and thermal resistance sensor RtB one end is connected with the output terminal other end respectively, reference resistance III, thermal resistance sensor RtA, thermal resistance sensor RtB other end ground connection, described thermal resistance sensor RtA, thermal resistance sensor RtB is connected with two measured points respectively, and contact with measured medium, pick up measured point temperature signal.Described detection electric bridge can form two kinds of detection limit electric bridges according to the state of mode of operation analog switch K1.
Described signal amplification module comprises amplifier, enlargement ratio adjusting resistance, enlargement ratio selection analog switch, wherein enlargement ratio adjusting resistance Rx one end selects analog switch to be connected with enlargement ratio, the enlargement ratio adjusting resistance Rx other end is connected with the feedback resistance input end of amplifier, and enlargement ratio selects the analog switch other end to be connected with amplifier out.Enlargement ratio selects analog switch can change the resistance value of enlargement ratio adjusting resistance Rx in different on off states, adjusts the enlargement factor of amplifier.Described signal amplification module selects the selected multiplying power of analog switch to amplify detecting the output signal of electric bridge according to enlargement ratio.
Beneficial effect of the present invention:
1. the present invention can accurately measure the temperature difference of two measured points, and can detect simultaneously or calculate the temperature of two measured points, and differential temperature survey precision is high;
2. the present invention can arrange the range of instrument manually or automatically, to guarantee that instrument is operated in optimum Working, meets the requirement of wide-range, has solved the relevant issues that prior art exists;
3. can for the large temperature difference and small temperature difference, measure, manually or automatically switching range simultaneously; Be easy to verification;
4. easy and simple to handle, can detect measured point temperature simultaneously.
Accompanying drawing explanation
Fig. 1 is temperature difference detector structural representation;
Wherein, 1 detects electric bridge, 2 signal amplification modules, and 3 samplings keep module, 4 analog-to-digital conversion modules, 5 computings and Logic control module, 6 human-machine interface modules, 7 communication modules, 8 divider resistance I, 9 mode of operation analog switch K1,10 thermal resistance sensor RtA, 11 thermal resistance sensor RtB, 12 reference resistance III, 13 amplifiers, 14 enlargement ratio adjusting resistances, 15 enlargement ratios are selected analog switch K2,16 current-limiting resistances, 17 sampled analog K switch 3,18 keep electric capacity, 19 amplifiers, 20 divider resistance II.
Embodiment
In order to understand better the present invention, below in conjunction with accompanying drawing, explain in detail embodiments of the present invention.
As shown in Figure 1, a kind of temperature difference detector, mainly comprises and detects electric bridge 1, signal amplification module 2, sampling maintenance module 3, analog-to-digital conversion module 4, computing and Logic control module 5, human-machine interface module 6, communication module 7; Described detection electric bridge 1 output terminal is connected with signal amplification module 2 input ends, signal amplification module 2 output terminals keep module 3 input ends to be connected with sampling, sampling keeps module 3 output terminals, analog-to-digital conversion module 4, computing and Logic control module 5 to connect successively, described computing and Logic control module 5 are connected with human-machine interface module 6, communication module 7 respectively, and computing simultaneously and Logic control module 5 keep module 3 to be connected with detection electric bridge 1, signal amplification module 2, sampling respectively;
Described computing and Logic control module 5 are controlled as required and are detected electric bridge 1, signal amplification module 2, sampling and keep module 3 duty separately for: a.; B. gather the result data of analog-to-digital conversion module 4, and calculate temperature and the temperature difference data of two measured points; C. control human-machine interface module 6 demonstration information, receive input data or the instruction of human-machine interface module 6, and press command request work; D. communication control module 7 is carried out communication with external unit, sends data, obtains instruction, and presses and press command request work;
Described signal amplification module 2 is for amplifying detecting the output signal U of electric bridge 1;
Described sampling keeps module 3 for signal amplification module 2 output signal V are sampled and kept;
Described analog-to-digital conversion module 4 comprises AD conversion element and auxiliary circuit, completes the analog-to-digital conversion to signal.
Described detection electric bridge 1 comprises divider resistance I 8, divider resistance II 20, mode of operation analog switch K19, thermal resistance sensor RtA10, thermal resistance sensor RtB11, reference resistance III 12, wherein divider resistance I 8, one end of divider resistance II 20 is connected with power input E respectively, divider resistance I 8 other ends by mode of operation analog switch K19 respectively with reference resistance III 12, thermal resistance sensor RtA10 connects, divider resistance I 8, mode of operation analog switch K19 is connected with one end of output terminal respectively simultaneously, the other end of divider resistance II 20, and thermal resistance sensor RtB11 one end is connected with the output terminal other end respectively, reference resistance III 12, thermal resistance sensor RtA10, thermal resistance sensor RtB11 other end ground connection, described thermal resistance sensor RtA10, thermal resistance sensor RtB11 is connected with two measured points respectively, and contact with measured medium, pick up measured point temperature signal.Can switch electric bridge is that temperature detection electric bridge or the temperature difference detect electric bridge.Described detection electric bridge 1 can form two kinds of detection limit electric bridges according to the state of mode of operation analog switch K19:
If a. closed with the direct-connected switch of thermal resistance sensor RtB11 in mode of operation analog switch K19, another switch disconnects, detect electric bridge and be equivalent to the temperature detection electric bridge being formed by divider resistance I 8, thermal resistance sensor RtA10, thermal resistance sensor RtB11, when thermal resistance sensor RtA10 and thermal resistance sensor RtB11 resistance be not etc. time, electric bridge output U representative is when the first two measured point temperature difference, for the temperature difference of two measured points;
If b. closed with participation resistance III 12 direct-connected switches in mode of operation analog switch K19, another switch disconnects, detect electric bridge and be equivalent to the temperature detection electric bridge being formed by divider resistance I 8, thermal resistance sensor RtA10, reference resistance III 12, when thermal resistance sensor RtA10 and reference resistance III 12 resistances are not etc. time, electric bridge output U represents that Current Temperatures changes, for detection of the temperature of the first measured point.
Described temperature difference detector, can detect the temperature difference of two measured points, also can detect the temperature of one of them point, and calculate the temperature of another point.
Described signal amplification module 2 comprises amplifier 13, enlargement ratio adjusting resistance Rx14, enlargement ratio selection analog switch K215, wherein enlargement ratio adjusting resistance Rx14 one end selects analog switch K215 to be connected with enlargement ratio, the enlargement ratio adjusting resistance Rx14 other end is connected with the feedback resistance input end of amplifier, and enlargement ratio selects the analog switch K215 other end to be connected with amplifier out.Enlargement ratio selects analog switch K215 can change the resistance value of enlargement ratio adjusting resistance Rx14 in different on off states, adjusts the enlargement factor of amplifier 13.Described signal amplification module 2 is for amplifying detecting the output signal U of electric bridge 1.
Described sampling keeps module 3 to comprise current-limiting resistance 16, sampled analog K switch 317, keeps electric capacity 18, amplifier 19.Wherein, an input end of current-limiting resistance 16, sampled analog K switch 317, amplifier 19 connects successively, and maintenance electric capacity 18 one end are connected with this input end of amplifier 19, other end ground connection; Described sampling keeps module 3 for amplifier output signal V is sampled and kept, when sampled analog switch 17 is closed, amplifier output signal V keeps electric capacity 18 to charge by 16 pairs of current-limiting resistances, while gathering analog switch 17 disconnection, stop charging, keep electric capacity 18 in hold mode, amplifier 19 is exported to analog-to-digital conversion module 4 by capacitance voltage signal equivalence.
Described computing and Logic control module 5 are critical components of temperature difference detector, mainly complete following work:
A. control as required the closed and disconnected state of mode of operation analog switch K19, enlargement ratio selection analog switch K215, sampled analog K switch 317;
B. gather the result data of analog-to-digital conversion module 4, and calculate temperature and the temperature difference data of two measured points;
C. control human-machine interface module 6 demonstration information, receive input data or the instruction of human-machine interface module 6, and press command request work;
D. communication control module 7 is carried out communication with external unit, sends data, obtains instruction, and presses and press command request work;
Above-mentioned calibration process can be undertaken or carry out the instrument misalignment in the situation that by the cycle, can all calibrate as required or part calibration.
Although above-mentioned, by reference to the accompanying drawings the embodiment of invention is described; but be not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (5)

1. a temperature difference detector, is characterized in that, comprises and detects electric bridge, signal amplification module, sampling maintenance module, analog-to-digital conversion module, computing and Logic control module, human-machine interface module, communication module; Described detection electric bridge output terminal is connected with signal amplification module input end, signal amplification module output terminal keeps module input to be connected with sampling, sampling keeps module output terminal, analog-to-digital conversion module, computing and Logic control module to connect successively, described computing and Logic control module are connected with human-machine interface module, communication module respectively, and computing simultaneously and Logic control module keep module to be connected with detection electric bridge, signal amplification module, sampling respectively;
Described signal amplification module is for amplifying detecting the output signal U of electric bridge;
Described sampling keeps module for signal amplification module output signal V is sampled and kept;
Described analog-to-digital conversion module comprises AD conversion element and auxiliary circuit, completes the analog-to-digital conversion to signal;
Described computing and Logic control module are used for: a. controls as required and detects electric bridge, signal amplification module, sampling maintenance module duty separately; B. gather the result data of analog-to-digital conversion module, and calculate temperature and the temperature difference data of two measured points; C. control human-machine interface module and show information, receive input data or the instruction of human-machine interface module, and press command request work; D. communication control module and external unit carry out communication, send data, obtain instruction, and press and press command request work.
2. temperature difference detector as claimed in claim 1, is characterized in that, described detection electric bridge comprises divider resistance I, divider resistance II, mode of operation analog switch, thermal resistance sensor RtA, thermal resistance sensor RtB, reference resistance III, electric resistance partial pressure resistance I wherein, one end of divider resistance II is connected with power input E respectively, the divider resistance I other end by mode of operation analog switch K respectively with reference resistance III, thermal resistance sensor RtA connects, while divider resistance I, mode of operation analog switch K is connected with one end of output terminal respectively, the other end of divider resistance II, and thermal resistance sensor RtB one end is connected with the output terminal other end respectively, reference resistance III, thermal resistance sensor RtA, thermal resistance sensor RtB other end ground connection, described thermal resistance sensor RtA, thermal resistance sensor RtB is connected with two measured points respectively, and contact with measured medium, pick up measured point temperature signal.
3. temperature difference detector as claimed in claim 2, is characterized in that, described detection electric bridge can form two kinds according to the state of mode of operation analog switch K1 and detect electric bridge.
4. temperature difference detector as claimed in claim 1, it is characterized in that, described signal amplification module comprises amplifier, enlargement ratio adjusting resistance, enlargement ratio selection analog switch, wherein enlargement ratio adjusting resistance Rx one end selects analog switch to be connected with enlargement ratio, the enlargement ratio adjusting resistance Rx other end is connected with the feedback resistance input end of amplifier, and enlargement ratio selects the analog switch other end to be connected with amplifier out.Enlargement ratio selects analog switch can change the resistance value of enlargement ratio adjusting resistance Rx in different on off states, adjusts the enlargement factor of amplifier.
5. temperature difference detector as claimed in claim 4, is characterized in that, described signal amplification module selects the selected multiplying power of analog switch to amplify detecting the output signal of electric bridge according to enlargement ratio.
CN201320550538.0U 2013-09-05 2013-09-05 Temperature difference detector Withdrawn - After Issue CN203422168U (en)

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Application Number Priority Date Filing Date Title
CN201320550538.0U CN203422168U (en) 2013-09-05 2013-09-05 Temperature difference detector

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Application Number Priority Date Filing Date Title
CN201320550538.0U CN203422168U (en) 2013-09-05 2013-09-05 Temperature difference detector

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103439018A (en) * 2013-09-05 2013-12-11 济钢集团有限公司 Temperature difference detector and detection method
CN108828428A (en) * 2016-01-11 2018-11-16 南京协辰电子科技有限公司 Insulated test device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103439018A (en) * 2013-09-05 2013-12-11 济钢集团有限公司 Temperature difference detector and detection method
CN103439018B (en) * 2013-09-05 2016-08-17 济钢集团有限公司 Temperature difference detector and to temperature, the detection method of the temperature difference
CN108828428A (en) * 2016-01-11 2018-11-16 南京协辰电子科技有限公司 Insulated test device

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C25 Abandonment of patent right or utility model to avoid double patenting
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Granted publication date: 20140205

Effective date of abandoning: 20160817