CN103439018A - Temperature difference detector and detection method - Google Patents
Temperature difference detector and detection method Download PDFInfo
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- CN103439018A CN103439018A CN2013104014935A CN201310401493A CN103439018A CN 103439018 A CN103439018 A CN 103439018A CN 2013104014935 A CN2013104014935 A CN 2013104014935A CN 201310401493 A CN201310401493 A CN 201310401493A CN 103439018 A CN103439018 A CN 103439018A
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Abstract
The invention discloses a temperature difference detector and a detection method. The temperature difference detector comprises a detection bridge, a signal amplification module, a sampling maintenance module, an analog/digital conversion module, an operation and logic control module, a man-machine interface module and a communication module. The output end of the detection bridge is connected with the input end of the signal amplification module. The output end of the signal amplification module is connected with the input end of the sampling maintenance module. The output end of the sampling maintenance module, the analog/digital conversion module and the operation and logic control module are connected in turn. The operation and logic control module is respectively connected with the man-machine interface module and the communication module. Meanwhile, the operation and logic control module is respectively connected with the detection bridge, the signal amplification module and the sampling maintenance module. The temperature difference detector can be simultaneously applied to measurement of large temperature difference and minimal temperature difference, measuring range can be switched manually or automatically so that the temperature difference detector is easy to verify. Besides, temperature of a detected point can be detected simultaneously.
Description
Technical field
The present invention relates to the monitoring equipment technical field, particularly a kind of high-precision detector of the temperature difference for wide range measure and detection method.
Background technology
Differential temperature survey is the deviation situation that detects the temperature between two different measured points.Differential temperature survey commonly used 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, and mode one is lower because of the temperature detection accuracy, and the temperature difference the data precision after as calculated is 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 recorded.Therefore the application scenario effect that above two kinds of modes are larger for the temperature difference is better, but less application scenario error more maybe can not be measured in the temperature difference.
Temperature checking method commonly used has contact type measurement and two kinds of modes of non-contact measurement, and wherein the precision of contact type measurement is the highest.3 types of sensors such as thermal resistance commonly used, thermopair, thermistor in contact type measurement.Wherein, thermal resistance is generally used for high precision, middle low-temperature measurement field, and thermopair is generally used for the 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
Purpose 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; The 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 the measured point temperature simultaneously.
The present invention also provides the detection method of temperature difference detector.
The technical scheme of technical solution problem of the present invention is:
A kind of temperature difference detector, comprise and detect 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 amplified for the output signal U to detecting electric bridge;
Described sampling keeps module for signal amplification module output signal V is sampled and keeps;
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 an end of output terminal respectively, the other end of divider resistance II, and thermal resistance sensor RtB mono-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 the 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 mono-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 be amplified the output signal that detects electric bridge according to enlargement ratio.
The method of utilizing temperature difference detector to be detected, comprise the steps:
A. standard resistance box is replaced to thermal resistance sensor RtA access respective input, and temperature difference detector is arranged on to the range calibration state;
B. the temperature value that will calibrate by human-machine interface module input, and according to the resistance shown, standard resistance box is set, temperature difference detector detects and records corresponding AD translation data under the different multiplying state automatically;
C. repeat the b step according to temperature from 0 ℃ and operate repeatedly, each temperature value equivalence increases progressively, to 850 ℃ of end range calibrations;
D. temperature difference detector is arranged on to the zero point correction state, by thermal resistance sensor RtA10 and thermal resistance sensor RtB access respective input, and two thermal resistance sensors are put into to mixture of ice and water and kept a period of time, temperature difference detector automatically detect and record under temperature detecting mode, under the different multiplying state, corresponding 0 ℃ the time AD translation data as temperature detection value at zero point, and automatically detect and record under temperature difference detecting pattern, under the different multiplying state, corresponding AD translation data detects value at zero point as the temperature difference, and points out and exit zero point correction;
E. confirm that by human-machine interface module 6 testing process finishes and preserves all parameters, calibration process finishes.
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 the differential temperature survey precision is high;
2. the present invention can arrange the range of instrument manually or automatically, to guarantee 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 the measured point temperature simultaneously.
The 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 comprise and detect 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 amplified for the output signal U to detecting electric bridge 1;
Described sampling keeps module 3 for signal amplification module 2 output signal V are sampled and keep;
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 the 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 an end of output terminal respectively simultaneously, the other end of divider resistance II 20, and thermal resistance sensor RtB11 mono-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 the 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. in mode of operation analog switch K19 with the direct-connected switch closure of thermal resistance sensor RtB11, another switch disconnects, detect electric bridge and be equivalent to the temperature detection electric bridge 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 do not wait, electric bridge output U representative is when the first two measured point temperature difference, for the temperature difference of two measured points;
If b. in mode of operation analog switch K19 with participate in resistance III 12 direct-connected switch closures, another switch disconnects, detect electric bridge and be equivalent to the temperature detection electric bridge 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 do not wait, 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 mono-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 amplified for the output signal U to detecting 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 1 ends 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 keeps, when sampled analog switch 17 is closed, amplifier output signal V keeps electric capacity 18 to be charged 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;
The method of utilizing temperature difference detector to be detected, comprise the steps:
A. standard resistance box is replaced to thermal resistance sensor RtA10 access respective input, and temperature difference detector is arranged on to the range calibration state;
B. the temperature value that will calibrate by human-machine interface module 6 inputs, and according to the resistance shown, standard resistance box is set, temperature difference detector detects and records corresponding AD translation data under the different multiplying state automatically;
C. repeat the b step according to temperature from 0 ℃ and operate repeatedly, each temperature value equivalence increases progressively, to 850 ℃ of end range calibrations;
D. temperature difference detector is arranged on to the zero point correction state, by thermal resistance sensor RtA10 and thermal resistance sensor RtB11 access respective input, and two thermal resistance sensors are put into to mixture of ice and water and kept a period of time, temperature difference detector automatically detect and record under temperature detecting mode, under the different multiplying state, corresponding 0 ℃ the time AD translation data as temperature detection value at zero point, and automatically detect and record under temperature difference detecting pattern, under the different multiplying state, corresponding AD translation data detects value at zero point as the temperature difference, and point out and exit zero point correction;
E. confirm that by human-machine interface module 6 testing process finishes and preserves all parameters, calibration process finishes.Described temperature difference detector working method is:
If a. the mode of operation switch is set to temperature detecting mode, detecting electric bridge is the temperature detection electric bridge, detects the temperature of the first measured point;
If b. the mode of operation switch is set to temperature difference detecting pattern, detecting electric bridge is that the temperature difference detects electric bridge, detects the temperature difference of two measured points;
C. calculate the second measured point temperature according to the temperature difference of the first measured point temperature and two measured points by computing method;
D. according to the facilities of instrument temperature range and temperature difference measuring range parameters, instrument can work in fixedly under range and two kinds of patterns of automatic range.
F. under the automatic range pattern, instrument is determined the work range according to the current detection data, if the current detection data are less than the certain ratio of work range, the range of working enlarges one-level, if the current detection data are greater than the certain ratio of work range, the range of working dwindles one-level.
Above-mentioned calibration process can be undertaken or, in the situation that the instrument misalignment is carried out, can all calibrate as required or the part calibration by the cycle.
Although above-mentioned, by reference to the accompanying drawings the embodiment of inventing 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 (6)
1. a temperature difference detector, is characterized in that, comprises and detect 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 amplified for the output signal U to detecting electric bridge;
Described sampling keeps module for signal amplification module output signal V is sampled and keeps;
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 an end of output terminal respectively, the other end of divider resistance II, and thermal resistance sensor RtB mono-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 the 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 and detect electric bridge according to the state of mode of operation analog switch K1.
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 mono-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 be amplified the output signal that detects electric bridge according to enlargement ratio.
6. the method for utilizing the described temperature difference detector of claim 2 to 5 any one to be detected, is characterized in that, comprises the steps:
A. standard resistance box is replaced to thermal resistance sensor RtA access respective input, and temperature difference detector is arranged on to the range calibration state;
B. the temperature value that will calibrate by human-machine interface module input, and according to the resistance shown, standard resistance box is set, temperature difference detector detects and records corresponding AD translation data under the different multiplying state automatically;
C. repeat the b step according to temperature from 0 ℃ and operate repeatedly, each temperature value equivalence increases progressively, to 850 ℃ of end range calibrations;
D. temperature difference detector is arranged on to the zero point correction state, by thermal resistance sensor RtA and thermal resistance sensor RtB access respective input, and two thermal resistance sensors are put into to mixture of ice and water and kept a period of time, temperature difference detector automatically detect and record under temperature detecting mode, under the different multiplying state, corresponding 0 ℃ the time AD translation data as temperature detection value at zero point, and automatically detect and record under temperature difference detecting pattern, under the different multiplying state, corresponding AD translation data detects value at zero point as the temperature difference, and points out and exit zero point correction;
E. confirm that by human-machine interface module testing process finishes and preserves all parameters, calibration process finishes.
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| CN201310401493.5A CN103439018B (en) | 2013-09-05 | 2013-09-05 | Temperature difference detector and to temperature, the detection method of the temperature difference |
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| CN201310401493.5A CN103439018B (en) | 2013-09-05 | 2013-09-05 | Temperature difference detector and to temperature, the detection method of the temperature difference |
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| CN103439018B CN103439018B (en) | 2016-08-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104484276A (en) * | 2014-12-24 | 2015-04-01 | 深圳市振邦智能科技有限公司 | Simple test method and simple test device of temperature detection program |
| CN105320021A (en) * | 2014-07-30 | 2016-02-10 | 北京国电智深控制技术有限公司 | Analog thermal resistance output device |
| CN109804230A (en) * | 2017-04-13 | 2019-05-24 | 富士电机株式会社 | Temperature-detecting device and the power conversion device for having it |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87214459U (en) * | 1987-10-21 | 1988-06-22 | 河北省标准计量学校 | Thermal resistance type thermometer with precision digital display |
| CN87214933U (en) * | 1987-11-05 | 1988-12-21 | 蔡德和 | Mini test warner for heat presenation & temprature of human body |
| CN203422168U (en) * | 2013-09-05 | 2014-02-05 | 济钢集团有限公司 | Temperature difference detector |
-
2013
- 2013-09-05 CN CN201310401493.5A patent/CN103439018B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214459U (en) * | 1987-10-21 | 1988-06-22 | 河北省标准计量学校 | Thermal resistance type thermometer with precision digital display |
| CN87214933U (en) * | 1987-11-05 | 1988-12-21 | 蔡德和 | Mini test warner for heat presenation & temprature of human body |
| CN203422168U (en) * | 2013-09-05 | 2014-02-05 | 济钢集团有限公司 | Temperature difference detector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105320021A (en) * | 2014-07-30 | 2016-02-10 | 北京国电智深控制技术有限公司 | Analog thermal resistance output device |
| CN104484276A (en) * | 2014-12-24 | 2015-04-01 | 深圳市振邦智能科技有限公司 | Simple test method and simple test device of temperature detection program |
| CN109804230A (en) * | 2017-04-13 | 2019-05-24 | 富士电机株式会社 | Temperature-detecting device and the power conversion device for having it |
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| CN103439018B (en) | 2016-08-17 |
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