CN105587679A - Mine ventilator temperature inspecting instrument based on Pt100 - Google Patents
Mine ventilator temperature inspecting instrument based on Pt100 Download PDFInfo
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- CN105587679A CN105587679A CN201410561934.2A CN201410561934A CN105587679A CN 105587679 A CN105587679 A CN 105587679A CN 201410561934 A CN201410561934 A CN 201410561934A CN 105587679 A CN105587679 A CN 105587679A
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Abstract
The invention provides a mine ventilator temperature inspecting instrument based on a Pt100. The temperature property of the platinum thermistor Pt100 and a general principle for conducting temperature measurement through the Pt100 are utilized, the requirement for online monitoring of the temperature of multiple parts of a mine ventilator is met, meanwhile, the measuring precision and accuracy are both improved, and the effect is very good in actual using. The mine ventilator temperature inspecting instrument comprises an upper computer, an RS485 communication module, a single-chip microcomputer module and a constant-current source module. The mine ventilator temperature inspecting instrument is structurally characterized in that the single-chip microcomputer module comprises a single-chip microcomputer A and a single-chip microcomputer B; the single-chip microcomputer A is connected with a parameter storage module and an A/D conversion module, and the constant-current source module is connected with a multi-path analog channel module; the multi-path analog channel module is connected with a multi-path sensor interface module, the multi-path sensor interface module is then connected with the multi-path analog channel module, and the multi-path analog channel module is then connected with the A/D conversion module; and the outer input end of the single-chip microcomputer B is connected with a digital keyboard module, and the outer output end of the single-chip microcomputer B is connected with a liquid crystal display module, an alarm module and a control module.
Description
Technical field
The invention belongs to coal mine ventilation field, relate to particularly a kind of Mine Ventilator temperature polling instrument based on Pt100.
Background technology
For colliery, the normal work of Mine Ventilator is the important leverage of safety in production, therefore the working state monitoring of ventilation blower is subject to obtaining the attention of country and coal mining enterprise always, and the temperature of the region of interest of ventilation blower is the important parameter of reflection ventilation blower duty, so the detection of temperature seems particularly important in ventilation blower monitoring.
Along with the fast development of sensor technology and electronic measurement technique, be widely used in industry spot taking single-chip microcomputer as main embedded system, novel electronic temperature measurement instrument is not only simple to operate, and ratio of precision traditional instrument improves a lot. Mainly contain thermocouple and thermal resistance at the on-the-spot most popular temperature sensor of industrial production at present, these temperature sensor measurement precision with thermocouple and thermal resistance form are not high, inaccurate.
Summary of the invention
The present invention is exactly for the problems referred to above, has proposed a kind of Mine Ventilator temperature polling instrument based on Pt100; The present invention adopts the temperature characterisitic of platinum resistance thermometer sensor, Pt100 and adopts Pt100 to carry out thermometric General Principle, has met the demand of Mine Ventilator multiple location on-line temperature monitoring, and certainty of measurement and the degree of accuracy be improved, and effect is fine in actual use.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
A kind of Mine Ventilator temperature polling instrument based on Pt100 of the present invention, comprises host computer, RS485 communication module, one-chip computer module, constant-current source module; Its structural feature is: described one-chip computer module comprises Chip Microcomputer A and single-chip microcomputer B; Described Chip Microcomputer A connects parameter memory module, A/D modular converter, described constant-current source module connects multi-channel analog channel module, described multi-channel analog channel module connects multiple sensor interface module, described multiple sensor interface module connects multi-channel analog channel module again, and described multi-channel analog channel module is connected with A/D modular converter again; Described single-chip microcomputer B external input terminals linking number code key disk module, outside output connects LCD MODULE, alarm module, control module.
As a preferred embodiment of the present invention, the Chip Microcomputer A of described one-chip computer module and single-chip microcomputer B adopt W77E58.
As another kind of preferred version of the present invention, described constant-current source module is made up of a voltage-reference and an operational amplifier.
As another kind of preferred version of the present invention, described A/D modular converter adopts 12 bits serial A/D chip MAX145 of the single supply difference input of MAXIM company.
As another kind of preferred version of the present invention, described multi-channel analog channel module adopts the 16 of MAXIM company road analog channel chip MAX396.
The invention has the beneficial effects as follows.
The present invention carries out thermometric General Principle with temperature characterisitic and the employing Pt100 of platinum resistance thermometer sensor, Pt100, and utilize Pt100 to design a kind of Mine Ventilator temperature polling instrument, system adopts the collaborative work of two W77E58 single-chip microcomputers, realize the mathematical model and the overload alarm of 16 paths, met the demand of Mine Ventilator multiple location on-line temperature monitoring.
The present invention utilizes data processing and the real-time detectability of single-chip microcomputer, adopt the four-wire system connection of Pt100 standard thermal resistance temperature sensor, conductor resistance is compensated, by single-chip microcomputer to signal sample, digital filtering, use interpolation algorithm to carry out non-linear correction processing to sensor, make this thermometric scheme there is the features such as broad quantum, good stability, dependable performance. But also Shortcomings of while, for example, while adopting current source to pass through Pt100, sensor self can produce the Joule heat of an amount, this heat has affected the precision of sensor to a certain extent, because electric current is less, heat is also little, negligible for the occasion that required precision is not high.
Brief description of the drawings
Fig. 1 is the theory diagram of a kind of Mine Ventilator temperature polling instrument based on Pt100 of the present invention.
Detailed description of the invention
As shown in Figure 1, be the theory diagram of a kind of Mine Ventilator temperature polling instrument based on Pt100 of the present invention. Comprising host computer, RS485 communication module, one-chip computer module, constant-current source module; Its structural feature is: described one-chip computer module comprises Chip Microcomputer A and single-chip microcomputer B; Described Chip Microcomputer A connects parameter memory module, A/D modular converter, described constant-current source module connects multi-channel analog channel module, described multi-channel analog channel module connects multiple sensor interface module, described multiple sensor interface module connects multi-channel analog channel module again, and described multi-channel analog channel module is connected with A/D modular converter again; Described single-chip microcomputer B external input terminals linking number code key disk module, outside output connects LCD MODULE, alarm module, control module.
RTD is to make on mica support with very thin platinum filament (Ф 0.03～0.07mm), is internationally recognized high precision measuring temperature standard transducer. Because the characteristics such as the certainty of measurement of RTD, measurement category, the linearity are all very good, most widely used in industrial production, the existing standard thermometric thermal resistance being made into by metal platinum on market, as Pt100, Pt500, Pt1000 etc. That the present invention adopts is Pt100, and the linearity of its resistance-temperature relation is very good.
The relation of RTD resistance and temperature can be similar to and represent with following formula: within the scope of 0～650 DEG C, have Rt=R0(1+At+Bt2) within the scope of-190～0 DEG C, there is Rt=R0(1+At+Bt2+C(t-100)t3) A, B, C are constant in formula, A=3.96847 × 10-3；B=-5.847×10-7；C=-4.22×10-12; Resistance value when Rt represents that temperature is t; R0Resistance value while being 0 DEG C for temperature, for the platinum resistance thermometer sensor, of this model of Pt100, R0Just equal 100 Ω, when environment temperature equals 0 degree, the resistance of Pt100 is exactly 100 Ω.
The essence of described Pt100 thermometric is to measure the resistance of Pt100 in fact, normally converts the variation of resistance to the analog signal such as voltage or electric current, then converts analog signal to data signal, then converse relevant temperature by processor. Adopt Pt100 to measure temperature and generally have two schemes: 1. constant-current source of design, by Pt100 thermal resistance, converses temperature by the variation that detects the upper voltage of Pt100; 2. adopt resistance bridge, in four resistance of electric bridge, three is constant, and another uses Pt100 thermal resistance, and in the time of Pt100 resistance change, test lead produces an electrical potential difference, and electrical potential difference converses temperature thus. The difference of two schemes is only the difference of signal acquisition circuit, basically identical in its principle, the present invention adopts the thermometric scheme of constant-current source as signal acquisition circuit, constant-current source is by Pt100 thermal resistance, variations in temperature causes the variation of Pt100 resistance value, from causing the variation of voltage, after amplification through AD adopt after, send by single-chip microcomputer processing, converse relevant temperature.
The use of platinum resistance thermometer sensor,, generally has three kinds of connections, is respectively two-wire system connection, three-wire system connection and four-wire system connection, that different connections is adapted to different precision and cost otherwise ask, and four-wire system connection precision is the highest, but cost is also the highest; Of the present invention is four-wire system connection.
Constant-current source of the present invention is by platinum resistance thermometer sensor, Pt100, detects the voltage variety on Pt100 and obtains temperature signal, and described constant-current source is to be made up of a voltage-reference and an operational amplifier.
Multi-channel analog channel module of the present invention is realized the quick switching of multiple passages, needs only like this road constant-current source, and a road A/D sampling channel can be realized multi channel testing function, can also ensure the uniformity of each channel current simultaneously. The analog channel switch chip that native system uses is the 16 of MAXIM company road analog channel chip MAX396. This chip in conjunction with Enable Pin EN, selects a-road-through road and COM termination logical by address wire A3～A0, therefore needs only the address increment by Single-chip Controlling address wire A3～A0, can realize the touring switching of 16 paths, very easy to use. In the present invention, adopted four MAX396, be respectively used to the switching of constant-current source and A/D sampling channel, constant-current source and A/D sampling channel will synchronously switch, and the address wire of four MAX396 is and connects.
The Chip Microcomputer A of one-chip computer module of the present invention and single-chip microcomputer B adopt W77E58; Described A/D modular converter adopts 12 bits serial A/D chip MAX145 of the single supply difference input of MAXIM company; Described multi-channel analog channel module adopts the 16 of MAXIM company road analog channel chip MAX396.
Claims (5)
1. the Mine Ventilator temperature polling instrument based on Pt100, comprises host computer, RS485 communication module, one-chip computer module, constant-current source module; It is characterized in that: described one-chip computer module comprises Chip Microcomputer A and single-chip microcomputer B; Described Chip Microcomputer A connects parameter memory module, A/D modular converter, described constant-current source module connects multi-channel analog channel module, described multi-channel analog channel module connects multiple sensor interface module, described multiple sensor interface module connects multi-channel analog channel module again, and described multi-channel analog channel module is connected with A/D modular converter again; Described single-chip microcomputer B external input terminals linking number code key disk module, outside output connects LCD MODULE, alarm module, control module.
2. a kind of Mine Ventilator temperature polling instrument based on Pt100 according to claim 1, is characterized in that: the Chip Microcomputer A of described one-chip computer module and single-chip microcomputer B adopt W77E58.
3. a kind of Mine Ventilator temperature polling instrument based on Pt100 according to claim 1, is characterized in that: described constant-current source module is made up of a voltage-reference and an operational amplifier.
4. a kind of Mine Ventilator temperature polling instrument based on Pt100 according to claim 1, is characterized in that: described A/D modular converter adopts 12 bits serial A/D chip MAX145 of the single supply difference input of MAXIM company.
5. a kind of Mine Ventilator temperature polling instrument based on Pt100 according to claim 1, is characterized in that: described multi-channel analog channel module adopts the 16 of MAXIM company road analog channel chip MAX396.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561934.2A CN105587679A (en) | 2014-10-21 | 2014-10-21 | Mine ventilator temperature inspecting instrument based on Pt100 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410561934.2A CN105587679A (en) | 2014-10-21 | 2014-10-21 | Mine ventilator temperature inspecting instrument based on Pt100 |
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| CN105587679A true CN105587679A (en) | 2016-05-18 |
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| CN201410561934.2A Pending CN105587679A (en) | 2014-10-21 | 2014-10-21 | Mine ventilator temperature inspecting instrument based on Pt100 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877604A (en) * | 2017-03-29 | 2017-06-20 | 上海浩正电气有限公司 | A kind of intelligent self-starting magneto |
| CN108151902A (en) * | 2017-12-13 | 2018-06-12 | 天津津航计算技术研究所 | Temperature collecting device and method based on platinum resistance |
| CN108548611A (en) * | 2018-03-05 | 2018-09-18 | 中科美其（天津）科技有限公司 | Multichannel temperature method for inspecting and logging for environmental test chamber detection |
-
2014
- 2014-10-21 CN CN201410561934.2A patent/CN105587679A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877604A (en) * | 2017-03-29 | 2017-06-20 | 上海浩正电气有限公司 | A kind of intelligent self-starting magneto |
| CN108151902A (en) * | 2017-12-13 | 2018-06-12 | 天津津航计算技术研究所 | Temperature collecting device and method based on platinum resistance |
| CN108548611A (en) * | 2018-03-05 | 2018-09-18 | 中科美其（天津）科技有限公司 | Multichannel temperature method for inspecting and logging for environmental test chamber detection |
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Application publication date: 20160518 |
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