CN103616080A - Portable optical fiber radiation thermodetector and measuring method thereof - Google Patents
Portable optical fiber radiation thermodetector and measuring method thereof Download PDFInfo
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- CN103616080A CN103616080A CN201310593874.8A CN201310593874A CN103616080A CN 103616080 A CN103616080 A CN 103616080A CN 201310593874 A CN201310593874 A CN 201310593874A CN 103616080 A CN103616080 A CN 103616080A
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Abstract
The invention discloses a portable optical fiber radiation thermodetector and a measuring method of the portable optical fiber radiation thermodetector, and belongs to the field of pyrometry. The thermodetector comprises a high-power optical fiber coupler, an energy transmitting optical fiber, a photoelectric detector, a pre-amplification module, an AD sampling module, a signal processing module, a display module, a keyboard input module, a digital-to-analog conversion module and a 4-20mA current loop. Thermal radiation energy at a broadband spectrum is coupled by the high-power optical fiber coupler and transmitted to the photoelectric detector by the energy transmitting optical fiber to convert optical signals into electrical signals, the electrical signals are sampled by the AD sampling module, obtained sampled signals are analyzed by the signal processing module through the curve-fitting algorithm, and a corresponding temperature value can be worked out finally through calibration. The portable optical fiber radiation thermodetector is very suitable for measuring crystal oven thermal fields due to the structure, easy and convenient to use and very practical.
Description
Technical field
The present invention relates to crystal oven thermal field surveying instrument, relate to particularly a kind of portable fiber-optic type Radiation Temperature Measurement Instrument and measuring method thereof of measuring crystal oven thermal field.
Background technology
Radiation Temperature Measurement Instrument is often applied to the high temperature measurement in the fields such as chemical industry, the energy, metallurgy and scientific research.For 1800 ℃ of above measurement ranges, Radiation Temperature Measurement Instrument relies on the energy of non-cpntact measurement infrared emanation to calculate corresponding temperature, the measurement upper limit is not subject to the restriction of temperature-sensing element heatproof degree, thereby to the not restriction in principle of the highest observable temperature, so obtained application widely at industrial circle.Due to advantages such as the resolution of Radiation Temperature Measurement Instrument are high, and temperature measurement accuracy is high, reproducible, therefore in high temperature measurement, be generalizable.Such as the MS/MI series infrared thermometer that Germany's match is risen, the system accuracy in the scope of 1500 ℃ to 2500 ℃ reaches 0.5% measured value, and repeatable accuracy is 0.1% thermometric value+1K, and temperature resolution is 0.1 ℃.Take this type of high-precision infrared thermometer that is representative is the philosophy based on blackbody radiation, records the corresponding relation of emittance and the relevant temperature of specific band, and the emissivity of respective material is revised, thereby extrapolate corresponding temperature.But the optical lens of these appliance requires precisions and complicated light signal processing device, thereby be difficult to make compact conformation, cheap surveying instrument.
Traditional Radiation Temperature Measurement Instrument structure is generally huge, and light path is complicated, responsive on the impact of bad border, and expensive, therefore in the urgent need to more simple, compact, stable temp measuring system.In addition, most Radiation Temperature Measurement Instrument is a kind of technology based on photoelectricity precise temperature measurement, so photodetector is the key element in precise temperature measurement technology.The photovalve of very early time mostly is photomultiplier and photoelectric tube, requires several hectovolts to the high pressure of several kilovolts in the application of this class electron tube, and spectral response all at visible ray near infrared range.Afterwards, the photodetector that lightweight, volume was little occurs successively.And all improve a lot and improve at aspects such as stability, sensitivity, spectral response range, passband widths, and in engineering application, occupied irreplaceable position very soon.
Summary of the invention
The object of this invention is to provide portable fiber-optic Radiation Temperature Measurement Instrument, this instrument is a kind of surveying instrument that can detect superhigh temperature.Another object of the present invention is to provide a kind of this portable fiber-optic Radiation Temperature Measurement Instrument of utilizing and carries out thermometric method.
The present invention is that the technical scheme that its technical matters of solution adopts is:
Portable fiber-optic Radiation Temperature Measurement Instrument, is comprised of optical system and Circuits System, it is characterized in that: described optical system connects energy-transmission optic fibre by high-power optical fiber coupled device and forms; Described Circuits System comprises photodetector, prime amplifier, AD sampling module, signal processing module, display module, key-press input, D/A converter module and electric current loop, wherein, described photodetector, prime amplifier, AD sampling module are connected successively with signal processing module, described display module, key-press input and D/A converter module are connected with described signal processing module respectively, and described electric current loop is connected with described D/A converter module; The output terminal of described energy-transmission optic fibre is connected with the input end of photodetector.
Wherein, described electric current loop adopts 4-20mA electric current loop.Photodetector adopts the InGaAs photodiode of standard FC/PC encapsulation.Prime amplifier adopts logarithmic amplifier.What AD sampling module adopted is 24 high-precision sampling A/D chip.
In order to utilize above-mentioned portable fiber-optic Radiation Temperature Measurement Instrument, measure the temperature of crystal oven, mensuration method of the present invention comprises the following steps: first high-power optical fiber coupled device is installed on the viewport of crystal oven, open the switch on viewport, the heat radiation energy in stove just converges on the end face of energy-transmission optic fibre by high-power optical fiber coupled device so; Energy is transferred on photodetector by energy-transmission optic fibre again, and then emittance converts corresponding current signal to by photodetector; Current signal carries out I/V conversion and amplification through pre-amplifying module, and the voltage signal obtaining is sampled accurately by AD sampling module; Simulating signal converts to after digital signal, and the sampled signal that the Algorithm Analysis through signal processing module by curve obtains, is finally gone out corresponding temperature value and exported by display module by calibrated and calculated; Mode by 4-20mA electric current loop after digital signal also can digital-to-analogue turns is transferred on computer to be processed by virtual instrument Labview; When test different temperatures scope, can to the algorithm parameter in signal processing module, modify by key-press input, the convenient accurate measurement that adapts to different temperatures section.
The present invention has following beneficial effect: the high-power optical fiber coupled device coupled wavelength scope that (1) adopts is super wide, in the scope of 0.4 μ m～2.5 μ m, has high coupling efficiency, directly plug, and repeatability and interchangeability are very good; (2) adopting fibre core is the energy-transmission optic fibre of 600 μ m, and Energy Transfer loss is extremely low.In optical cable coating the inside, there is layer of metal armour, the inside fibre core is protected, have the anti-stretch-proof function of suppressing.Utilize optical fiber to come transmitting energy can reduce the difficulty of installation and the protection of temperature measurer, and make temperature measurer there is flexible and miniaturization; (3) photodetector of the present invention adopts the InGaAs photodiode of standard FC/PC encapsulation to be connected very convenient with energy-transmission optic fibre, the use of optical fiber can not be subject to the impact of electromagnetic interference (EMI), and make photodetector away from high temp objects, guaranteed the stability working online for a long time.(4) highly integrated Circuits System is very convenient is arranged on above crystal oven control desk, is beneficial to operator and observes; (5) the present invention adopts accurate logarithmic amplifier to carry out I/V conversion to feeble signal, and the sampling A/D chip of 24 samples, guaranteed the measurement performance of whole instrument: measurement range is 800-2200 ℃, measuring accuracy is ± 0.2%, resolution is 1 ℃, and response speed is less than 1ms.
Accompanying drawing explanation
Fig. 1 is the system chart of portable fiber-optic Radiation Temperature Measurement Instrument of the present invention;
Fig. 2 is the structural drawing of portable fiber-optic Radiation Temperature Measurement Instrument of the present invention;
Fig. 3 is the software processing flow chart to signal in measuring method of the present invention.
Embodiment
Below in conjunction with accompanying drawing and implementation method, the present invention is described in further details.
As Fig. 1, in apparatus of the present invention, optical system is comprised of high-power optical fiber coupled device 1 connection energy-transmission optic fibre 2, wherein the coupled wavelength scope of high-power optical fiber coupled device 1 is 0.4 μ m～2.5 μ m, and the diameter of its coupled lens is 25mm, and what energy-transmission optic fibre 2 adopted is that fibre core is the silica fibre of 600 μ m; Circuits System is comprised of photodetector 3, prime amplifier 4, AD sampling module 5, signal processing module 6, display module 7, key-press input 8, D/A converter module 9 and 4-20mA electric current loop 10, and all module integrations are on an electronic cartridge.Optical system is independently to separate with Circuits System, can avoid the interference of thermometric scene to instrument thermometric completely.Wherein, prime amplifier 4 adopts logarithmic amplifier to process feeble signal, can accurately small and weak current signal be changed into voltage signal.What AD sampling module 5 adopted is 24 high-precision sampling A/D chip, the simulating signal that can accurately sample and obtain at work.Photodetector 3 adopts the InGaAs photodiode of standard FC/PC encapsulation.Optical system and being connected of Circuits System are that the output terminal by energy-transmission optic fibre 2 is connected with the input end of photodetector 3; Fig. 2 is physical construction schematic diagram of the present invention.
In conjunction with Fig. 1 and Fig. 2, the implementation method of utilizing optical system received radiation energy, measuring temperature is described.First high-power optical fiber coupled device 1 is installed on the viewport of crystal oven, opens the switch on viewport, the heat radiation energy in stove just converges on the end face of energy-transmission optic fibre 2 by high-power optical fiber coupled device 1 so; Energy is transferred on photodetector 3 by energy-transmission optic fibre 2 again, and then emittance converts corresponding current signal to by photodetector 3; Current signal carries out I/V conversion and amplification through pre-amplifying module 4, and the voltage signal obtaining is sampled accurately by AD sampling module 5; Simulating signal converts to after digital signal, and the algorithm through signal processing module 6 by curve calculates corresponding temperature value and exports by display module 7; Digital signal also can be transferred on computer and be processed by virtual instrument Labview by the mode of 4-20mA electric current loop 10,4-20mA electric current loop 10 can be realized temperature online monitoring, and virtual instrument Labview can draw performance graph and preserve the temperature value of each timing node.。When test different temperatures scope, can modify by the algorithm parameter in 8 pairs of signal processing modules 6 of key-press input, the convenient accurate measurement that adapts to different temperatures section.
In conjunction with Fig. 3, the treatment scheme of signal processing module to signal in temperature measurer is described.After instrument start, signal processing module 6 is initialization AD sampling module 5 and display module 7 first, and AD sampling module 5 is in continuing sampling work state afterwards, and display module 7 is exported current temperature value.After opening the switch of view window, if voltage signal detected, change, AD sampling module 5 will obtain new sampling digital signal and pass to signal processing module 6 and calculate, and by the new temperature value of display module 7 output.
Temp measuring system can be applied in on-the-spot accurate temperature measurement, just must be through demarcating the temperature that could correctly demonstrate measured target.The polynomial curve fitting method based on least square method that the present invention adopts, measures multi-point temp and by matching, obtains the curve of a temperature trend again.The method that the present invention demarcates is that employing standard blackbody furnace substitutes measured target, gathers the voltage signal under different temperatures.Directly the relation of temperature and voltage sample yardage is carried out to 6 order polynomial curves, then obtain the formula of a temperature and sampling yardage: T=ax
6+ bx
5+ cx
4+ dx
3+ ex
2+ fx+g, wherein T be temperature (℃), x for sampling yardage, a, b, c, d, e, f, g is constant.The algorithm write signal processing module 6 of this formula, this sampling instrument just can work.
Claims (6)
1. portable fiber-optic Radiation Temperature Measurement Instrument, is comprised of optical system and Circuits System, it is characterized in that: described optical system connects energy-transmission optic fibre by high-power optical fiber coupled device and forms; Described Circuits System comprises photodetector, prime amplifier, AD sampling module, signal processing module, display module, key-press input, D/A converter module and electric current loop, wherein, described photodetector, prime amplifier, AD sampling module are connected successively with signal processing module, described display module, key-press input and D/A converter module are connected with described signal processing module respectively, and described electric current loop is connected with described D/A converter module; The output terminal of described energy-transmission optic fibre is connected with the input end of photodetector.
2. portable fiber-optic Radiation Temperature Measurement Instrument according to claim 1, is characterized in that, described electric current loop adopts 4-20mA electric current loop.
3. portable fiber-optic Radiation Temperature Measurement Instrument according to claim 1, is characterized in that, described photodetector adopts the InGaAs photodiode of standard FC/PC encapsulation.
4. portable fiber-optic Radiation Temperature Measurement Instrument according to claim 1, is characterized in that, described prime amplifier adopts logarithmic amplifier.
5. portable fiber-optic Radiation Temperature Measurement Instrument according to claim 1, is characterized in that, what described AD sampling module adopted is 24 high-precision sampling A/D chip.
6. utilize the measuring method of portable fiber-optic Radiation Temperature Measurement Instrument as claimed in claim 1, it is characterized in that, comprise the following steps: first high-power optical fiber coupled device is installed on the viewport of crystal oven, open the switch on viewport, the heat radiation energy in stove just converges on the end face of energy-transmission optic fibre by high-power optical fiber coupled device so; Energy is transferred on photodetector by energy-transmission optic fibre again, and then emittance converts corresponding current signal to by photodetector; Current signal carries out I/V conversion and amplification through pre-amplifying module, and the voltage signal obtaining is sampled accurately by AD sampling module; Simulating signal converts to after digital signal, and the sampled signal that the Algorithm Analysis through signal processing module by curve obtains, is finally gone out corresponding temperature value and exported by display module by calibrated and calculated; Mode by 4-20mA electric current loop after digital signal also can digital-to-analogue turns is transferred on computer to be processed by virtual instrument Labview; When test different temperatures scope, can to the algorithm parameter in signal processing module, modify by key-press input, the convenient accurate measurement that adapts to different temperatures section.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568216A (en) * | 2014-12-24 | 2015-04-29 | 合肥协知行信息系统工程有限公司 | Single wavelength temperature measuring system |
| CN105606226A (en) * | 2016-02-03 | 2016-05-25 | 江苏浩瀚蓝宝石科技有限公司 | Portable fiber radiation thermometric indicator |
| CN106225951A (en) * | 2016-08-31 | 2016-12-14 | 江苏能建机电实业集团有限公司 | Sapphire fiber blackbody chamber pyrostat and temp measuring method thereof |
| CN112254836A (en) * | 2020-09-23 | 2021-01-22 | 菲兹克光电(长春)有限公司 | Optical fiber ultra-high temperature thermometer based on colorimetric method |
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| JPS58137723A (en) * | 1982-02-10 | 1983-08-16 | Omron Tateisi Electronics Co | Apparatus for measuring temperature |
| CN102135455A (en) * | 2010-11-18 | 2011-07-27 | 杭州自动化技术研究院有限公司 | Non-contact temperature measurement method, point temperature instrument and application thereof |
| CN103162858A (en) * | 2011-12-11 | 2013-06-19 | 飞秒光电科技(西安)有限公司 | High temperature photoelectric temperature measuring system |
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2013
- 2013-11-21 CN CN201310593874.8A patent/CN103616080A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58137723A (en) * | 1982-02-10 | 1983-08-16 | Omron Tateisi Electronics Co | Apparatus for measuring temperature |
| CN102135455A (en) * | 2010-11-18 | 2011-07-27 | 杭州自动化技术研究院有限公司 | Non-contact temperature measurement method, point temperature instrument and application thereof |
| CN103162858A (en) * | 2011-12-11 | 2013-06-19 | 飞秒光电科技(西安)有限公司 | High temperature photoelectric temperature measuring system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568216A (en) * | 2014-12-24 | 2015-04-29 | 合肥协知行信息系统工程有限公司 | Single wavelength temperature measuring system |
| CN105606226A (en) * | 2016-02-03 | 2016-05-25 | 江苏浩瀚蓝宝石科技有限公司 | Portable fiber radiation thermometric indicator |
| CN106225951A (en) * | 2016-08-31 | 2016-12-14 | 江苏能建机电实业集团有限公司 | Sapphire fiber blackbody chamber pyrostat and temp measuring method thereof |
| CN112254836A (en) * | 2020-09-23 | 2021-01-22 | 菲兹克光电(长春)有限公司 | Optical fiber ultra-high temperature thermometer based on colorimetric method |
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Application publication date: 20140305 |