电热膜热成像英文文献.docx

电热膜热成像英文文献.docx

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电热膜热成像英文文献

英文文献翻译

Thetechnologyofgeneratinginfraredimagebasedonelectricheatingfilmtechnology

基于电热膜技术的红外图像生成技术

文献来源：

脉冲功率激光技术国家重点实验室

Thetechnologyofgeneratinginfraredimagebasedon

electricheatingfilmtechnology

ABSTRACT

Thetechnologyofgeneratinginfraredimagebasedonelectricheatingfilmtechnologybyitsresistanceperunitareawasstudied.ALifgt-off-roadvehiclewasusedasanobjecttobesimulated.Aninfraredthermographwasusedtophotographythelight-off-roadvehiclefromaspecificcorner.Asaresultseveralinfraredimagesofthelight-off-roadvehiclewereobtainedandthethermaldistributionofthevehiclewasalsoobtainedatthesametime.Amatlabprogramwasusedtoprocesstheimage.Theimagewasdividedintoseveralareasaccordingtoitsgreylevel.Eachareahasitsowntemperaturerange.Theaveragetemperatureofeachareawascalculated.Athermalbalanceequationwasestablishedaccordingtotheaveragetemperatureofeachareaandtheenvironmenttemperature.Bysolvingtheseequations,theradiantexistancesoftheseareasweregotten.Theheatingpowerperunitareaoftheseareaswascalculated.Theelectricheatingfilmwaspreparationaccordingly.Thepowerwasappliedonthefilmandtheinfraredthermographwasusedtoobserveit.Theinfraredimageofthefilmhasahighsimilaritywiththetruelight-off-roadvehicle’s.

Keywords:

electricheatingfilm,infraredimage,simulation

1.PRINCIPLESOFOPERATION

Allkindsobjectshaveinfraredradiation.Theinfraredradiantcharacteristicofanobjectisdependingonitssurfacetemperatureanditssurfaceemissivity.TheradiationcanbecalculatedbyPlanckequation.Theusualformoftheequationiswrittenintermsoftheradiantexitanceasafunctionofwavelength.Consideringtheemissivityofacertainobject,theradiantexitancecanbewritten[1]:

（1）

Where

isthespectralradiantexitance,

isthefirstradiationconstantand

isthesecondradiationconstant.Theyaregivenby:

Wherecisthespeedoflightinvacuum,hisPlanck’sconstant,kisBoltzmann’sconstant,andTisthetemperatureinkelvins.

Sincetheemissivityisfixedforcertainmaterial,thetemperatureisthemajorfactorthatinfluencesinfraredradiation.Itisusuallymoreusefultoknowthevalueofthetotalpoweremittedfromabody,ratherthanitsspectralextent.Thewell-knownStephan-Boltzmannlawgivesthetotalradiantexitanceas:

（2）

Whereistheemissivityofanobject.istheStephan-Boltzmannconstant.Ithasbeenevaluatedandisgivenby

Foranobject,thereasonofitshowingdifferentinfraredimageisthatithasdifferenttemperatureondifferentpartsofit.Thuswecansimulateatrueobject’sinfraredimagebyreappearingthetemperatureoftheobject.

Thetechnologyofgeneratinginfraredimagebasedonelectricheatingfilmtechnologywasbroughtforwardaccordingtotheinfraredradiationtheory.Themaincourseis:

theinfraredimageofanobjectwasobtainedfirstly,andthentheimagewasdividedintoseveralareasaccordingtoitstemperatureanditsgreylevel.Theradiationpowerofthesepartswascalculated.Theresistanceperunitareaofthesepartswerecalculatedwhenthevoltageofthefilmwascertain.Theheatingfilmwaspreparedaccordingtotheresistanceperunitarea.Whenthefilmwasheatedbyelectricitypower,therelevantinfraredimagewillappear.

2.INFRAREDIMAGEOBTAINOFANOBJECTANDRELATIVELYCALCULATION

2.1infraredimageanditstemperaturedistributing

ALight-off-roadvehiclewasusedasanobjecttobesimulated.Thevehiclewasfiredupinidlestate.Tenminuteslate,aninfraredthermographwasusedtophotographythelight-off-roadvehiclefromaspecificcorner.Fig.1wastheinfraredimageofthevehicle.

Fig.1infraredimageofaLight-off-roadvehicle

Theanalysisandprocesstotheimagewascarriedout.Theinfraredimagewasdividedintoseventemperatureareasbyitsgreylevel.Theseareasshowedinfig.2.Theaveragetemperatureoftheareaisthesameforthoseareaswhichhavethesamenumber.

Fig.2thegreylevelofthevehicle

Theaveragetemperatureoftheseareasshowedintable1andthetemperatureofbackgroundis24℃.

Table1Theaveragetemperatureofdifferentareas

AreaNo.

1

2

3

4

5

6

7

AverageTemperature（℃）

38.4

37.0

31.0

26.8

26.1

31.2

38.0

Fortheseareas,wehypothesizedthatthearea“i”hasatemperature

thetemperaturebackgroundis

.Theacreageofarea“i”is

.Theacreageoftheseareasiscalculated.

2.2Heatingpowercalculation

Whentheelectricheatingfilmwaspoweredon,mostoftheelectronpoweritgottenwasconvertedtoheatpower.Thetemperatureoftheseareasrose.Thetemperatureoftheseareaachievemaximumwhentheareawasinthermalequilibriumstatewiththeenvironment.Whenthefil