CN101551279A - Multi-channel thermocouple signal acquisition and measurement device - Google Patents
Multi-channel thermocouple signal acquisition and measurement device Download PDFInfo
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- CN101551279A CN101551279A CNA2008102417076A CN200810241707A CN101551279A CN 101551279 A CN101551279 A CN 101551279A CN A2008102417076 A CNA2008102417076 A CN A2008102417076A CN 200810241707 A CN200810241707 A CN 200810241707A CN 101551279 A CN101551279 A CN 101551279A
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Abstract
The invention discloses a multi-channel thermocouple signal acquisition and measurement device which comprises a multi-channel switch, a signal conditioning unit, a data sampling unit, a micro control unit, and a residual signal clearing unit, wherein the residual signal clearing unit is used for clearing the circuit residual signals before the sampling moment when the data sampling unit samples the thermocouple signal which is output by the signal conditioning unit. By adopting the proposal provided by the invention, the interference of the circuit residual signal after sampling of the previous moment on the sampling data at the current sampling moment is avoided and the mutual interference between adjacent channels is reduced by clearing the circuit residual signals before the thermocouple signal is sampled, thereby improving the accuracy of the acquisition and measurement and measurement speed of the thermocouple signal and being conducive to meeting the market competition demand for quickly and accurately measuring the thermocouple signal.
Description
Technical field
The present invention relates to technical field of automation, relate in particular to a kind of multi-channel thermocouple signal acquisition and measurement device.
Background technology
In many traditional industries, particularly in automatic measurement control field, the accuracy of detection of temperature parameter is to robotization control procedure important influence.At present, the most widely used detector unit is a thermopair, thermopair is the temperature sensor of being made by the node of two kinds of different metal conductors, the output voltage that is produced and the temperature difference between hot junction and lead (cold junction) are proportional, be a kind of be temperature transition the device of voltage, can be used for measuring physical quantitys such as temperature, its measurable temperature range is bigger.But in the temperature survey process, because the signal of thermocouple sensor fainter (being the millivolt magnitude voltage signals), the collection of thermocouple signal may be subjected to the various interference of industry spot in addition, and therefore how gathering thermocouple signal has quickly and accurately become one of gordian technique of Current Temperatures measurement mechanism.Under dut temperature changes slowly situation, can use the multi-channel scanning switch to be equipped with a high precision measuring temperature table and carry out multichannel temperature measurement and data acquisition.But change occasion faster at count out more, dut temperature of temperature survey, in the automatic gauge verification system and high-temperature sterilization case automated verification system as a large amount of thermal resistances, thermopair, traditional scan-type multichannel temperature measurement system can't satisfy practical application request.In recent years, constantly perfect along with the continuous decline of high-precision a/d converter spare price and A/D converter spare function, the multichannel that development cost is lower, fast, the high precision temperature acquisition system becomes possibility.
Fig. 1 is the structured flowchart of prior art multi-channel thermocouple signal acquisition system.In the middle of this multi-channel thermocouple signal acquisition system, adopted multiplexed mode, by multi-way switch the timesharing of multi-channel thermocouple signal is switched to one tunnel shared signal conditioning circuit and carry out signal condition, pass through an analog to digital converter (Analog-to-Digital Converter through the signal after the signal condition, ADC) carry out being sent to microcontroller (Micro Control Unit MCU) handling accordingly after signals collecting and the conversion.
The inventor is in realizing process of the present invention, find that above-mentioned multi-channel thermocouple signal acquisition system is when carrying out thermocouple signal acquisition, because the residual signal of a last measured passage, accuracy reduces in the time of can causing measuring this passage, if improve the sampling rate that accuracy of measurement just must the reduction system, cause systematic survey speed to descend, so this multi-channel thermocouple signal acquisition system is difficult to satisfy the market competition demand that thermocouple signal is quick and precisely measured.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the embodiment of the invention provides a kind of multi-channel thermocouple signal acquisition and measurement device, to improve the measuring speed and the accuracy of measurement of multi-channel thermocouple signal.
In order to address the above problem, the embodiment of the invention provides a kind of multi-channel thermocouple signal acquisition and measurement device, comprising:
Multi-way switch is used for according to the default thermocouple signal sampling period timesharing of multi-channel thermocouple signal being switched to same signal condition unit;
The signal condition unit is used for the thermocouple signal of described multi-way switch output being carried out signal condition, the thermocouple signal after the output signal conditioning;
The data sampling unit is used for the thermocouple signal of described signal condition cell signal conditioning back output is carried out analog to digital conversion, and the thermocouple signal data of being gathered on each road are obtained in sampling;
Micro-control unit is used for controlling described multi-way switch timesharing according to the default thermocouple signal sampling period and switches described multi-channel thermocouple signal, and the thermocouple signal data that described data sampling unit sampling obtains are handled;
The residue signal clearing cell is used for removing the circuit residue signal before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit sampling unit output.
A kind of multi-channel thermocouple signal acquisition and measurement device that the embodiment of the invention provides, by before the sampling instant of the thermocouple signal of data sampling unit sampling signal condition unit output, removing the circuit residue signal, reduced the phase mutual interference between the multi-channel thermocouple signal, thereby accuracy and measuring speed that thermocouple signal acquisition is measured have been improved, the market competition demand that is content with very little thermocouple signal is quick and precisely measured.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structured flowchart of prior art multi-channel thermocouple signal acquisition system;
Fig. 2 is the composition synoptic diagram of a kind of multi-channel thermocouple signal acquisition and measurement device of the embodiment of the invention;
Fig. 3 is the circuit diagram of a kind of multi-channel thermocouple signal acquisition and measurement device of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 2 is the composition synoptic diagram of a kind of multi-channel thermocouple signal acquisition and measurement device of the embodiment of the invention.This device mainly comprises: multi-way switch 20, burn out detection unit 21, signal condition unit 22, residue signal clearing cell 23, data sampling unit 24, micro-control unit 25.This be will describe below in detail and the function of each unit and contact each other installed.
Concrete, multi-way switch 20 is under the control of micro-control unit 25, and according to the default thermocouple signal sampling period, road thermocouple signal in the thermocouple signal of selection multichannel input is realized multiplexed as the thermocouple signal of output.Need to prove that described multi-way switch can be multiway analog switch or the multi-way switch that is formed by a plurality of relay assemblies.Multi-way switch and mechanical switch are similar, also can have jitter phenomenon when passage switches, and also being multi-way switch switches to moment of next passage from a last passage, the phenomenon of signal transients can occur.
Burn out detection unit 21 is used for according to the default burn out detection cycle burn out detection being carried out in the thermopair loop;
Concrete, when measurement mechanism need carry out burn out detection, burn out detection unit 21 detected the thermopair loop according to the default burn out detection cycle, judged whether broken string.During concrete enforcement, burn out detection unit 21 is under the control of micro-control unit 25, signal conditioning circuit is charged according to the default burn out detection cycle, the voltage signal that obtains by computational data sampling unit 24 judges whether the thermopair loop breaks then, if the voltage signal very big (much larger than thermocouple signal) that data sampling unit 24 obtains, can judge that then the thermopair loop is in the broken string state, otherwise can judge that the thermopair loop is not in the broken string state, the user can take corresponding processing according to the different conditions in thermopair loop.
Concrete, because the thermocouple signal of multi-way switch 20 outputs is generally all fainter, be the millivolt magnitude voltage signals, and the collection of thermocouple signal may be subjected to the various interference of industry spot, so signal condition unit 22 need carry out described thermocouple signal the standard signal that filtering and treatment conversion such as amplification become data sampling unit 24 to discern.During concrete enforcement, can adopt amplifying circuit and filtering circuit to realize.
Residue signal clearing cell 23 is used for removing the circuit residue signal before the sampling instant of the thermocouple signal of the described data sampling unit 24 described signal condition of sampling unit 22 outputs;
Concrete, when thermocouple signal being gathered measurement, because the circuit residue signal after the previous moment sampling can impact current time sampled signal data, cause sampled data inaccurate, so before current thermocouple signal is sampled, need described residue signal clearing cell 23 to remove the circuit residue signal of last sampling instant.Accordingly, when burn out detection is carried out in the thermopair loop,, then can on circuit, produce a large amount of residue signals if there is broken string in a certain road, influence the accuracy of other channel signal measurement data, therefore also need residue signal clearing cell 23 to carry out residue signal and remove.During concrete enforcement, described residue signal clearing cell 23 comprises a switch element 230 and at least one current-limiting resistance 231, and this current-limiting resistance 231 can be other equivalent current limiting element.After being connected in series with described current-limiting resistance 231, described switch element 230 is parallel to the two ends of sampling capacitance, described current-limiting resistance 231, described switch element 230, described sampling capacitance is formed a closed-loop path, described switch element 220 comprises a controlled pin that is electrically connected with described micro-control unit 25, described micro-control unit 25 is controlled the described switch element 230 of conducting in one section Preset Time of described switch element 230 before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit 24 samplings unit 22 outputs by described controlled pin, thereby sampling capacitance and whole loop are carried out rapid discharge, remove the circuit residue signal of last sampling instant.
Data sampling unit 24 is used for the thermocouple signal of exporting behind described signal condition unit 22 signal conditions is carried out analog to digital conversion, and the thermocouple signal data of being gathered on each road are obtained in sampling;
Concrete, carry out rapid discharge at 23 pairs of sampling capacitances of described residue signal clearing cell and whole loop, thereby removed after the circuit residue signal of last sampling instant, the thermocouple signal of the 24 pairs of conditionings in data sampling unit signal element, 22 conditioning back outputs carries out analog to digital conversion, and the thermocouple signal data of being gathered on each road are obtained in sampling.During concrete enforcement, described data sampling unit 24 can be high-precision A/D converter.
Concrete, described micro-control unit 25 comprises first control sub unit 250, second control sub unit 251 and the 3rd control sub unit.Wherein, first control sub unit 250 is used for controlling described multi-way switch 20 according to the default thermocouple signal sampling period multi-channel thermocouple signal input timesharing is switched to same signal condition unit 22; Second control sub unit 251 is used for by the described switch element 220 of conducting in one section Preset Time of the described switch element 230 of the controlled foot control system of switch element 220 before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit 24 samplings unit 22 outputs.The 3rd control sub unit 252 is used for carrying out burn out detection according to the default described burn out detection of burn out detection periodic Control unit 21.The thermopair data that 24 samplings of 25 pairs of data sampling units of micro-control unit are obtained are handled and are obtained temperature measurement result.
Below in conjunction with concrete circuit the multi-channel thermocouple signal acquisition and measurement device that the embodiment of the invention provides is described.
Fig. 3 is the circuit diagram of a kind of multi-channel thermocouple signal acquisition and measurement device of the embodiment of the invention.As shown in the figure, wherein MUX is a multi-way switch, resistance R 5, R6, R7, R8, triode Q1, Q2 constitute break detection circuit, R1, R2, R3, R4, C2, C3, C4, C5 constitute signal conditioning circuit, and D1, R9, R10, sampling capacitance C1 and whole loop constitute the rapid discharge loop of residue signal.The thermocouple signal sampled measurements cycle is: multi-way switch (Multiplexer, MUX) at microcontroller (Micro Control Unit, MCU) measuring passage from last one under the control switches to this measurement passage and exports thermocouple signal, MCU is by the described discharge loop of control switch unit D1 conducting, discharge loop is by current-limiting resistance R9, R10 carries out rapid discharge to sampling capacitance C1 and whole loop, remove the circuit residue signal of previous moment sampling, the thermocouple signal of multi-way switch output produces voltage signal on charging capacitor C1 after the signal conditioning circuit conditioning then, A/D can obtain the thermocouple signal data of being gathered on each road by the voltage signal of gathering on the charging capacitor C1, and last MCU handles described thermopair data and obtains temperature measurement result.If multi-way switch is measured passage from last one and is switched to this measurement passage and export thermocouple signal, this moment, A/D sampled to the thermocouple signal of multi-way switch output, then the residue signal that remains on sampling capacitance C1 and the whole loop after the previous moment sampling can impact this sampled data, causes the data that collect inaccurate.The embodiment of the invention provides multi-channel thermocouple signal acquisition and measurement device, before the sampling instant of the thermocouple signal that A/D sampling multi-way switch is exported, by the rapid discharge loop sampling capacitance C1 and whole loop are carried out rapid discharge, in time removed the circuit residue signal of a last sampling instant, improved the accuracy of measurement device data, and because the impedance of discharge loop is very little, can be at short notice the residue signal on sampling capacitance C1 and the whole loop be removed, thereby also improved the measuring speed of thermocouple signal.Equally, in the process of burn out detection, the remaining constantly burn out detection voltage signal of last burn out detection can exert an influence to the burn out detection signal of current time collection equally, before the sampling instant of the thermocouple signal that A/D sampling multi-way switch is exported, by the rapid discharge loop sampling capacitance C1 and whole loop are carried out rapid discharge, in time that last burn out detection is remaining constantly burn out detection voltage signal is removed, thereby has improved accuracy of measurement and measuring speed.
In sum, a kind of multi-channel thermocouple signal acquisition device that the embodiment of the invention provides, by before the sampling instant of the thermocouple signal of data sampling unit sampling signal condition unit output, removing the circuit residue signal, avoided circuit residue signal after the previous moment sampling to the interference of current sampling instant sampled data, reduced the phase mutual interference between adjacency channel, thereby accuracy and measuring speed that thermocouple signal acquisition is measured have been improved, the market competition demand that is content with very little thermocouple signal is quick and precisely measured.
Above disclosed is a kind of preferred embodiment of the present invention only, can not limit the present invention's interest field certainly with this, and therefore the equivalent variations of doing according to claim of the present invention still belongs to the scope that the present invention is contained.
Claims (6)
1, a kind of multi-channel thermocouple signal acquisition and measurement device comprises:
Multi-way switch is used for according to the default thermocouple signal sampling period timesharing of multi-channel thermocouple signal being switched to same signal condition unit;
The signal condition unit is used for the thermocouple signal of described multi-way switch output being carried out signal condition, the thermocouple signal after the output signal conditioning;
The data sampling unit is used for the thermocouple signal of described signal condition cell signal conditioning back output is carried out analog to digital conversion, and the thermocouple signal data of being gathered on each road are obtained in sampling;
And micro-control unit, be used for controlling described multi-way switch timesharing and switch described multi-channel thermocouple signal, and the thermocouple signal data that described data sampling unit sampling obtains are handled according to the default thermocouple signal sampling period; It is characterized in that, also comprise:
The residue signal clearing cell is used for removing the circuit residue signal before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit sampling unit output.
2, device as claimed in claim 1, it is characterized in that, described residue signal clearing cell comprises a switch element and at least one current-limiting resistance, after being connected in series, described switch element and described current-limiting resistance be parallel to the two ends of sampling capacitance, described current-limiting resistance, described switch element, described sampling capacitance is formed a closed-loop path, described switch element comprises a controlled pin that is electrically connected with described micro-control unit, and described micro-control unit is controlled the described switch element of conducting in one section Preset Time of described switch element before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit sampling unit output by described controlled pin.
3, device as claimed in claim 1 is characterized in that, the thermocouple signal of remnants when described circuit residue signal is the last sampling instant sampling of current sampling instant of thermocouple signal of the described signal condition of described data sampling unit sampling unit output.
4, device as claimed in claim 1 is characterized in that, described device also comprises the burn out detection unit that is used to detect broken string that is arranged between described multi-way switch and the described signal condition unit.
5, device as claimed in claim 4, it is characterized in that thermocouple signal or the remaining constantly burn out detection voltage signal of last burn out detection of remnants when described circuit residue signal is the last sampling instant sampling of current sampling instant of thermocouple signal of the described signal condition of described data sampling unit sampling unit output.
6, device as claimed in claim 4 is characterized in that, described micro-control unit comprises:
First control sub unit is used for controlling described multi-way switch according to the default thermocouple signal sampling period multi-channel thermocouple signal input timesharing is switched to same signal condition unit;
Second control sub unit is used for controlling the described switch element of conducting in one section Preset Time of described switch element before the sampling instant of the thermocouple signal of the described signal condition of described data sampling unit sampling unit output by described controlled pin;
The 3rd control sub unit is used for carrying out burn out detection according to the default described burn out detection of burn out detection periodic Control unit.
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| CN2008102417076A CN101551279B (en) | 2008-12-26 | 2008-12-26 | Multi-channel thermocouple signal acquisition and measurement device |
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| CN2008102417076A CN101551279B (en) | 2008-12-26 | 2008-12-26 | Multi-channel thermocouple signal acquisition and measurement device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445286A (en) * | 2010-09-30 | 2012-05-09 | 深圳市合信自动化技术有限公司 | Temperature measuring method and system based on programmable logic controller |
| CN103675596A (en) * | 2013-12-17 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Wire breakage detection circuit and temperature acquisition circuit |
| CN108121248A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | A kind of general signal pickup assembly of multichannel based on bus |
| CN109188086A (en) * | 2018-09-19 | 2019-01-11 | 许昌学院 | A kind of test method that temperature influences space medium material electric conductivity |
| CN110474642A (en) * | 2019-09-03 | 2019-11-19 | 上海贝岭股份有限公司 | The control method of multichannel ADC module and its signal interference, controller |
| CN113703369A (en) * | 2021-08-31 | 2021-11-26 | 天津津航计算技术研究所 | Multi-channel thermocouple acquisition circuit based on analog switch |
| CN113865733A (en) * | 2020-06-12 | 2021-12-31 | 卓品智能科技无锡有限公司 | Time-sharing processing method and system for temperature input signals of multiple thermocouples |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3760265A (en) * | 1972-05-16 | 1973-09-18 | Honeywell Inc | Open circuit detection apparatus for thermocouple circuits |
| CN87208972U (en) * | 1987-06-11 | 1988-03-23 | 机械工业部北京机械工业自动化研究所 | Intelligent multi-channel temperature measurer |
| CN1952632A (en) * | 2006-11-09 | 2007-04-25 | 中国人民解放军海军工程大学 | High precision intelligent platinum thermal resistance temperature sensor with correction function |
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2008
- 2008-12-26 CN CN2008102417076A patent/CN101551279B/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445286A (en) * | 2010-09-30 | 2012-05-09 | 深圳市合信自动化技术有限公司 | Temperature measuring method and system based on programmable logic controller |
| CN102445286B (en) * | 2010-09-30 | 2014-07-23 | 深圳市合信自动化技术有限公司 | Temperature measuring method and system based on programmable logic controller |
| CN103675596A (en) * | 2013-12-17 | 2014-03-26 | 重庆川仪自动化股份有限公司 | Wire breakage detection circuit and temperature acquisition circuit |
| CN103675596B (en) * | 2013-12-17 | 2016-05-25 | 重庆川仪自动化股份有限公司 | A kind of break detection circuit and temperature collection circuit |
| CN108121248A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | A kind of general signal pickup assembly of multichannel based on bus |
| CN109188086A (en) * | 2018-09-19 | 2019-01-11 | 许昌学院 | A kind of test method that temperature influences space medium material electric conductivity |
| CN109188086B (en) * | 2018-09-19 | 2021-01-15 | 许昌学院 | Method for testing influence of temperature on conductivity of space dielectric material |
| CN110474642A (en) * | 2019-09-03 | 2019-11-19 | 上海贝岭股份有限公司 | The control method of multichannel ADC module and its signal interference, controller |
| CN113865733A (en) * | 2020-06-12 | 2021-12-31 | 卓品智能科技无锡有限公司 | Time-sharing processing method and system for temperature input signals of multiple thermocouples |
| CN113703369A (en) * | 2021-08-31 | 2021-11-26 | 天津津航计算技术研究所 | Multi-channel thermocouple acquisition circuit based on analog switch |
| CN113703369B (en) * | 2021-08-31 | 2024-04-05 | 天津津航计算技术研究所 | Multipath thermocouple acquisition circuit based on analog switch |
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