CN104501965A - Non-contact temperature measurement system applied to metal surface - Google Patents
Non-contact temperature measurement system applied to metal surface Download PDFInfo
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- CN104501965A CN104501965A CN201510015979.4A CN201510015979A CN104501965A CN 104501965 A CN104501965 A CN 104501965A CN 201510015979 A CN201510015979 A CN 201510015979A CN 104501965 A CN104501965 A CN 104501965A
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Abstract
The invention discloses a non-contact temperature measurement system applied to a metal surface, and relates to a temperature detection system. The system is provided with a power supply, an indicator light, an infrared non-contact temperature sensor, an LCD display screen, a relay, a buzzer, and a micro-processor; the infrared non-contact temperature sensor is connected with the micro-processor through the digital signal input terminal, and the infrared non-contact temperature sensor is used for sampling the temperature data of the tested object; the LCD display screen is connected with the micro-processor through a pull-up resistor; and the buzzer and the relay are respectively connected with the micro-processor. The polynomial fitting based on the least square method is used for compensation. The actual temperature of the metal surface is determined by the contact temperature measurement with higher precision, but the application is more inconvenient, and the data corresponds to the uncompensated infrared non-contact temperature measurement data one to one, and the data is processed to compensate the infrared non-contact temperature measurement by the polynomial fitting and so on, so that the temperature of the metal surface is measured by the infrared non-contact temperature measurement in the higher precision.
Description
Technical field
The present invention relates to a kind of system for detecting temperature, especially relate to one and be suitable for metal surface non-contact temperature measurement system.
Background technology
Current, application of infrared transducer is extensive, contain the every field such as commercial production, life, infrared measurement of temperature is because of its non-contacting characteristic, can, motion remote to some carry out temperature survey with dangerous object, it have safety, fast, the advantage such as reliable, convenient, be widely used in many fields such as electric power, oil, chemical industry, traffic be mechanical, medical and public arena, become the important means that Product checking, fault diagnosis and prevent disease are popular.Infrared measurement of temperature also can be used for meteorologic analysis, plant growth investigation, take precautions against natural calamities, antitheft etc.
Can find out, these application occasions require that sensor does not contact measured object usually, and range of temperature is little, and temperature variation is more steady.Non-contact infrared sensor thermometric embodies the advantage that it is cheap, simple to operate, thermometric is accurate, volume is little here.Meanwhile, design circuit is fairly simple, and components and parts are few, so reliability and stability are good, easy to use.Non-contact Infrared Temperature Measurement sensor also combines with the sensor of single-chip microcomputer and other type.
Because non-contacting infrared thermometric is measured according to blackbody radiation principle.If object is not black matrix, measurement is inaccurate, and cannot measure the distribution of object radiation rate.By compensation method to reduce error, improve precision.Compensation adjustment for emissivity can be carried out corresponding correction-compensation reduced its measuring error brought by the emissivity of testee clear and definite before thermometric.Compensation adjustment for measuring distance can preset a distance coefficient and carry out the temperature measurement error that Realization analysis distance factor brings, thus is that further temperature compensation is ready.Compensation adjustment for measurement environment can use traditional thermistor method.But when precision prescribed is higher, can software data processing be used, compensate.
Numerical analysis is that scientific domain is analyzed data, reduced the strong weapon of error, exploring law.In numerous numerical analysis method, least square method is especially noticeable.
Summary of the invention
One is the object of the present invention is to provide to be suitable for metal surface non-contact temperature measurement system.
The present invention is provided with power supply, pilot lamp, infrared non-contact temperature sensor, LCD display, relay, hummer, microprocessor and shell; The pilot lamp being used to indicate duty is connected with microprocessor, and described infrared non-contact temperature sensor is connected with microprocessor by digital signal input end, and infrared non-contact temperature sensor is for gathering the temperature data of measurand; Described LCD display is connected with microprocessor by pull-up resistor; Described hummer is connected with microprocessor respectively with relay.
Described shell can adopt low-resistance metal material to make closed meter case.
Described microprocessor can adopt model to be the single-chip microcomputer of STC89C52.
Described infrared non-contact temperature sensor can adopt TN901 sensor, the response time of TN901 sensor is 1s, refreshing frequency is 1.4Hz, precision is positive and negative 0.6 DEG C, resolution is 0.0625 DEG C, induction wave band 5 ~ 14 μm, only needs 3V or 5V Power supply, is different from most other infrared thermometers (9V); Clock and temperature compensation, integrated level is high, and size is little, and quality is light, and peripheral circuit is simple.
The present invention utilizes algorithm software to process data, can greatly raise the efficiency, and judges the order needing matching exactly, if k rank are best-fits, do not need to carry out more high order fitting, when defeated people's exponent number is greater than k, computing machine will send reminds programmer matching number of times improper.In order to simplify polynomial expression, adopt that Linear Quasi is incompatible compensates non-contact temperature measuring.
Demarcation of the present invention mainly adopts polynomial fitting method with calibration, compared to method of interpolation, ensures monotone increasing beyond observation data, can evade the point that fitting of a polynomial error outside sample point is larger; Also stochastic error (temperature, humidity, the light intensity) impact on curve can be reduced to a great extent; The relatively simple formula of structure can be drawn by fitting of a polynomial and write in C programmer, being conducive to the readability of program and follow-up exploitation.
In the present invention, commercial power rectification is obtained 5V direct supply, power switch is responsible for the duty of whole circuit, and pilot lamp makes circuit working whether very clear.Infrared non-contact temperature sensor completes the collection of measurand temperature data and reports.Microprocessor, as control center, is responsible for the clock signal and the temperature data that receive the transmission of infrared non-contact temperature sensor, through routine processes, is sent signal to LCD display, relay and hummer.
Adopt the fitting of a polynomial based on least square method in the present invention to compensate.Higher but use more inconvenient contact temperature-measuring to determine the actual temperature of metal surface by precision, simultaneously by data and uncompensated infrared non-contact temperature measuring data one_to_one corresponding, then by fitting of a polynomial etc., process to compensate infrared non-contact temperature measuring to data, realize measuring metallic surface temperature with infrared non-contact temperature measuring under degree of precision.
Algorithm routine of the present invention is mainly based upon on the basis of fitting of a polynomial thought, first non-contact temperature measuring data set a and contact thermography reference set b is inputted, then the initial value of matching number of times m is determined, then judge that whether data point used is enough, if enough, then export m rank multinomial coefficient and fitness bias, and increase matching number of times m above-mentioned steps repeatedly, until data set number not this m exponent arithmetic(al) time EOP (end of program).
The present invention mainly takes the method for electromagnetic screen, makes closed meter case with low-resistance metal material.Single-chip microcomputer receives clock signal and the temperature data of the transmission of infrared non-contact temperature sensor, through routine processes, controls LCD display, relay and hummer.The compensation program of temperature is contained in Single Chip Microcomputer (SCM) program.Infrared non-contact temperature sensor with its noncontact, irrelevantly mutually to disturb with measurand, the advantage such as temperature-measuring range is wide, fast response time in many occasions, especially power industry has good application prospect.
Because the impact of emissivity on temperature-measuring results is linear, therefore the present invention mainly considers that when data processing fitting of a polynomial comprises linear fit in the lower matching of interior number of times.The present invention adopts algorithm software to write fitting of a polynomial program, then the result that matching obtains is write in original Single Chip Microcomputer (SCM) program, thus non-contact temperature measuring is compensated, enable infrared non-contact temperature sensor TN901 under degree of precision, measure the temperature of metal surface.
The present invention possesses following characteristics: the Temperature Distribution not destroying measurand, fast response time, and measuring accuracy is high, and stability is strong, convenient directly perceived, is applicable to subsequent development etc., is embodied in:
(1) temperature measurement accuracy is better than 1 DEG C;
(2) single-chip microcomputer corresponding program download interface;
(3) the real-time displays temperature of LCD;
(4) civil power job requirement is met;
(5) working environment meets metal surface thermometric requirement.
Accompanying drawing explanation
Fig. 1 is the circuit composition frame chart of the embodiment of the present invention.
Embodiment
Following examples will the present invention is further illustrated by reference to the accompanying drawings.
See Fig. 1, the embodiment of the present invention is provided with 5V direct supply 2 (the input end external 220V AC power 1 of 5V direct supply 2), pilot lamp (not drawing in FIG), infrared non-contact temperature sensor 3, LCD display 5, relay 6, hummer 7, microprocessor 4 and shell; The pilot lamp being used to indicate duty is connected with microprocessor 4, and described infrared non-contact temperature sensor 3 is connected with microprocessor 4 by digital signal input end, and infrared non-contact temperature sensor 3 is for gathering the temperature data of measurand A; Described LCD display 5 is connected with microprocessor 4 by pull-up resistor; Described hummer 6 is connected with microprocessor 4 respectively with relay 7.
Described shell can adopt low-resistance metal material to make closed meter case.
Described microprocessor 4 can adopt model to be the single-chip microcomputer of STC89C52.
Described infrared non-contact temperature sensor 3 can adopt TN901 sensor, the response time of TN901 sensor is 1s, refreshing frequency is 1.4Hz, precision is positive and negative 0.6 DEG C, resolution is 0.0625 DEG C, induction wave band 5 ~ 14 μm, only needs 3V or 5V Power supply, is different from most other infrared thermometers (9V); Clock and temperature compensation, integrated level is high, and size is little, and quality is light, and peripheral circuit is simple.
In the present invention, single-chip microcomputer is control center, and model is STC89C52.Alternating current 220V AC power becomes 5V direct supply by rectification, for single-chip microcomputer is powered.Infrared non-contact temperature sensor sends signal to single-chip microcomputer after measurand state being detected, and wherein, the model of infrared non-contact temperature sensor is TN901.Program in single-chip microcomputer is downloaded by USB port.LCD display is connected with single-chip microcomputer by pull-up resistor, the data after LCD display display single-chip microcomputer process, i.e. the temperature that detects of infrared non-contact temperature sensor, the wherein model LCD1602 of display.Hummer is connected with single-chip microcomputer, when temperature exceedes threshold temperature, and buzzer warning.
In the present invention, the program loop in single-chip microcomputer detects the data that infrared sensor is surveyed, and calculate in real time again and upgrade display over the display, program loop detects simultaneously, when temperature exceedes threshold temperature, and buzzer warning.
In the present invention, the temperature that infrared sensor detects need through over-compensation, and the function of compensation is by algorithm software, and the fitting of a polynomial based on least square method draws.By compensating, the accuracy of detected temperatures can be improved.
Claims (4)
1. be suitable for a metal surface non-contact temperature measurement system, it is characterized in that being provided with power supply, pilot lamp, infrared non-contact temperature sensor, LCD display, relay, hummer, microprocessor and shell; The pilot lamp being used to indicate duty is connected with microprocessor, and described infrared non-contact temperature sensor is connected with microprocessor by digital signal input end, and infrared non-contact temperature sensor is for gathering the temperature data of measurand; Described LCD display is connected with microprocessor by pull-up resistor; Described hummer is connected with microprocessor respectively with relay.
2. one is suitable for metal surface non-contact temperature measurement system as claimed in claim 1, it is characterized in that described shell adopts low-resistance metal material to make closed meter case.
3. one is suitable for metal surface non-contact temperature measurement system as claimed in claim 1, it is characterized in that described microprocessor adopts model to be the single-chip microcomputer of STC89C52.
4. one is suitable for metal surface non-contact temperature measurement system as claimed in claim 1, it is characterized in that described infrared non-contact temperature sensor adopts TN901 sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510015979.4A CN104501965A (en) | 2015-01-13 | 2015-01-13 | Non-contact temperature measurement system applied to metal surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510015979.4A CN104501965A (en) | 2015-01-13 | 2015-01-13 | Non-contact temperature measurement system applied to metal surface |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034010A (en) * | 2007-02-15 | 2007-09-12 | 武汉钢铁(集团)公司 | Contacting/non-contacting molten metal high temperature measuring apparatus and measuring method |
| CN201464044U (en) * | 2009-08-03 | 2010-05-12 | 王蔚 | Non-contact temperature measuring device |
| CN103728044A (en) * | 2014-01-17 | 2014-04-16 | 厦门大学 | Contact type high-voltage electrical equipment temperature detection system |
-
2015
- 2015-01-13 CN CN201510015979.4A patent/CN104501965A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101034010A (en) * | 2007-02-15 | 2007-09-12 | 武汉钢铁(集团)公司 | Contacting/non-contacting molten metal high temperature measuring apparatus and measuring method |
| CN201464044U (en) * | 2009-08-03 | 2010-05-12 | 王蔚 | Non-contact temperature measuring device |
| CN103728044A (en) * | 2014-01-17 | 2014-04-16 | 厦门大学 | Contact type high-voltage electrical equipment temperature detection system |
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Application publication date: 20150408 |
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