infrared radiation 1

8/20/2019 Infrared Radiation 1

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Département Génie industrielle ENIT

Infrared Radiation

OBJECT:

To measure the emissivity of several samples and calculate the

resolution of the thermopile.

APPARATUS:

♣thermopile

♣electric heat gun

♣four emissivity samples: stainless steel, aluminium, glass, black paint.

♣digital thermopile temperature indicator

♣digital millivoltmeter

PRINCIPLES AND BACKGROUND:

In this experiment a black painted surface will serve as my reference

because this surface has an emissive power !."# and the emissive power of

the black painted surface is $%

&!."#' ( T%

To calibrate the thermopile it)s necessaryb to know the w% and the emf

wich the thermopile gives as a result of the w% .

Procedure:

*et the thermopiles and heat uniformely the samples of metals

until the temperature of ++!-, handle the thermopile by the support

only.

fter that we can take different measures /f e.m.f as a function of the

temperature.

1




Report:

STAINLESS STEAL

T°c 100 98 96 94 92 90 88 86 84

EMF(µv) 0.165 0.163 0.115 0.141 0.130 0.119 0.108 0.098 0.089

T°c 82 80 78 76 74 72 70 68 66 64

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 62 60 58 56 54 52 50 48 46 44

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 42 40 38 36 34 32 30

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030

Aluminium

T°c 100 98 96 94 92 90 88 86 84

EMF(µv) 0.165 0.163 0.115 0.141 0.130 0.119 0.108 0.098 0.089

T°c 82 80 78 76 74 72 70 68 66 64

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 62 60 58 56 54 52 50 48 46 44

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 42 40 38 36 34 32 30

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030

Glass

T°c 100 98 96 94 92 90 88 86 84

EMF(µv) 0.165 0.163 0.115 0.141 0.130 0.119 0.108 0.098 0.089

T°c 82 80 78 76 74 72 70 68 66 64

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 62 60 58 56 54 52 50 48 46 44

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 42 40 38 36 34 32 30

2




EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030

BLACK PAINT

T°c 100 98 96 94 92 90 88 86 84

EMF(µv) 0.165 0.163 0.115 0.141 0.130 0.119 0.108 0.098 0.089

T°c 82 80 78 76 74 72 70 68 66 64

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 62 60 58 56 54 52 50 48 46 44

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030 0.022

T°c 42 40 38 36 34 32 30

EMF(µv) 0.079 0.071 0.062 0.052 0.046 0.036 0.030

T°c 110 105 100 95 90 85 80 75 70

σ T4 1204.98 1143.13 1083.98 1027.02 972.33 919.85 869.53 821.3 775.11

T°c 65 60 55 50 45 40 35 30

σ T4 730.89 688.59 648.16 609.53 572.65 537.48 503.95 472.01

We have σ= 5.6!5 " #!$% &m$'($)*

+=,"#!% m.s$# * h=6.6'"#!$,) -.s * (=#.,%"#!$',

/o 0=σ "T ) 1&.m$'2 emissivit3 of the od3

We have 4=ai i i=#...) or p=!.6 1la+( paint2

7nd ap= 0e 0 1σT )2=410)59.68833.972(

24.044.0−−

−=.!)

In +onse8uen+e 4=96.0

04.7 =.,,

In result9 &e have:

a7=410)59.88.633.972(

132.0202.0−−

−='.)6 a=

K

a A =!.,,

3




a/=410)59.68833.972(

071.0130.0

−−

−

='.! *!.12

ag =

−

−

−410)59.68833.972(292.0555.0

;la+( paint metal:

e= a 1σ t)2 < * a=ap=5. =!.#$5.")!!"#!$)=$ !.#,%%

e= 5. σ t ) $!.#,%% = 6.'#&$.#,%%

7luminium:

e= a 1σ t)

2 < * a=ap=,.5% =$,.5%"')!"#!$)

=$!.!%5

e= ,.5% σ t) $!.!%5 = 6.'#&$!.!%5

/tainless steal:

e= a 1σ t)2 < * a=as='.#' =$'.#'",6!"#!$)=$!.!6,

e='.#' σ t) $!.!6, = 6.'#&$.!6,

4

infrared radiation 1

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