A EROSPACE E NGINEERING L ABORATORY (MAE308) PROF. SEUNG WOOK BAEK DPT. OF AEROSPACE ENGINEERING,...
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AEROSPACE ENGINEERING LABORATORY (MAE308) PROF. SEUNG WOOK BAEK DPT. OF AEROSPACE ENGINEERING, KAIST, IN KOREA ROOM : Building N7-2 #3304 TELEPHONE : 3714 [email protected] http://procom.kaist.ac.kr TA : Jonghan Won ROOM: Building N7-2 #3315 TELEPHONE : 3754 [email protected]
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Transcript of A EROSPACE E NGINEERING L ABORATORY (MAE308) PROF. SEUNG WOOK BAEK DPT. OF AEROSPACE ENGINEERING,...
AEROSPACE ENGINEERING LABORATORY (MAE308)
PROF. SEUNG WOOK BAEK DPT. OF AEROSPACE ENGINEERING, KAIST, IN KOREA
ROOM : Building N7-2 #3304 TELEPHONE : 3714 [email protected] http://procom.kaist.ac.kr
TA : Jonghan Won ROOM: Building N7-2 #3315 TELEPHONE : 3754 [email protected]
PROF. SEUNG WOOK BAEK DPT. OF AEROSPACE ENGINEERING, KAIST, IN KOREA
ROOM : Building N7-2 #3304 TELEPHONE : 3714 [email protected] http://procom.kaist.ac.kr
TA : Jonghan Won ROOM: Building N7-2 #3315 TELEPHONE : 3754 [email protected]
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Contents
Observation of Emitted Radiation from Light Source Using Spectrometer
A. Experimental setup
B. Background
C. Objectives
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Background
Radiation
Emission or transmission of energy in form of waves or
particles
Its importance becomes intensified at high temperature
No medium required
Radiative physical property depends on surface rough-
ness, material, thickness of coating, temperature, angle,
etc.
MAE 308
PROPULSION AND COMBUSTION LABORATORY
DEFINITION…An ideal body that allows all the incident radiation to pass
into it ( no reflected energy) and absorbs internally all the incident radiation ( no transmitted energy) ; perfect absorber of incident radiation.
PERFECT EMITTER IN EACH DIRECTION AND AT EVERY
WAVE LENGTH In equilibrium condition, the blackbody must radiate ex-
actly as much energy as it absorbs. The intensity of radiation from a blackbody is independent
of the direction of emission.
BLACKBODY
RADIATIVE HEAT TRANSFERPROPULSION AND COMBUSTION LABORATORY
RADIATIVE EQUILIBRIUM
MAE 308
PROPULSION AND COMBUSTION LABORATORY
HEMISPHERICAL SPECTRAL EMISSIVE POWER OF
BLACKBODY FOR SEVERAL DIFFERENT TEMPERATURES
PROPULSION AND COMBUSTION LABORATORY
RADIATIVE EQUILIBRIUM
RADIATIVE HEAT TRANSFER
Wien’s (Displacement) Law :
Plank’s Distribution Law :
MAE 308
PROPULSION AND COMBUSTION LABORATORY
ATTENUATION BY EARTH’S ATMOSPHERE OF
INCIDENT SOLAR SPECTRAL ENERGY FLUX
RADIATIVE HEAT TRANSFERPROPULSION AND COMBUSTION LABORATORY
GAS RADIATION
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Background
Fluorescence
Energy
+-
-Unique wavelength
N=1
N=2
N=3
External energy hits the electron
Electron goes to higher orbital
Elevated electron comes back to
original orbital for a brief time
Unique wavelength is emitted
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Incandescence
Background
Radiation from a hot body as a re-
sult of high temperature
Thermal radiation
Weak intensity in visible spectrum
at low temperature
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Experimental setup
Model name USB2000+VIS-NIR
Dimensions 89.1*63.3*34.4 mm
DetectorSony ILX511B(2048-element linear silicon CCD array)
Detector range 348-1026 nm
Best efficiency(>30%) 400-800 nm
Optical resolution ~0.1-10 nm (configuration dependent)
Specification
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Experimental setup
Operation principle
1
2
3
4
5
6 7
8
9
10
(Optional)(Optional)
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Experimental setup
Dark room
Computer
Spectrometer
Optical fiber400 µm
Radiation
MAE 308
PROPULSION AND COMBUSTION LABORATORY
Objectives
Purpose of experiment
1st week 2nd week
Observation of spectral radiation from light source
Analysis of unique wavelength
•Observation of spectral radi-
ation from fluorescent lamp
•Observation of spectral radia-
tion from incandescent
lamp and Sun
•Estimation of the temperature
