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Interferometric monitor for greenhouse gases (IMG) is a satellite born sensor based on FTIR developed in co-operation by JAROS, NASDA and NASA. IMG measured upwelling infrared radiance at fine spectral resolutions. The instrument was designed to have a very high spectral resolution (0.05 cm).The sensor will obtain very accurate spectra of of the thermal infrared radiation from the atmosphere and this data can be used deduce concentrations of greenhouse gases and water vapour.
In the IMG, the light coming from the surface of Earth and clouds is compared to the light from the Helium - Neon laser (He-Ne laser). And also a semiconductor detector (Si detector)
THE ACTUAL SENSOR USES A CCD CAMERA TO CAPTURE THE LIGHT!! THAT IS THE SENSOR
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Interferometry is a study of wavelenghts, light and interfernce interference (Hence the name). The usual component to study is electromagnetic radiation. Waves are superimposed, meaning they are manipulated in a way to give some meaningful analytical results. Usually light is used as the source of the electromagnetic waves.
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2. http://cnx.org/content/m22326/latest/graphics2.jpg
FTIR: !!JAFFRY CONTINUE HERE!!
Sensor details
THE ACTUAL SENSOR USES A CCD CAMERA TO CAPTURE THE LIGHT!! THAT IS THE SENSOR
The detectors are housed in the IR-detector below the cooling unit. There are three detectors, each corresponding to three different spectral channels.
- Two InSb (Indium Antimony, narrow-gap semiconductor from 3-4 group) detectors for the shorter wavelengths (3.3 - 4.3 nanometers)
- One HgCdTe (Mercury Cadmium Telluride) a semiconductor with a bandgap between 0 and 1.5 eV. This is for the longer wavelengths 4 - 15 nanometer) (4.)
- An onboard blackbody for calibration
- The mirror can also be moved to point toward space for calibration purposes
The sensors are cooled with the cooler to a temperature of below 80 K.
The incoming light beams are splitted into different wavelengths and reflected into the IR-sensor and then the different semiconductors absorb them in their rispectable operating wavelengths. These portions of the reflected beam power electrons to move onto the the next conduction band, thus causing that particular semiconductor to produce a current. This current is then registered and analyzed.
!!ADD THE SENSOR DETAILS!! CAN BE FOUND FROM LINK OF SOURCE 4!OR ACTUALLY THERE ARE THE IR DETECTOR AND SI DETECTOR! THIS NEEDS TO BE UNDERSTOOD!
Detection and monitoring of the vertical and spatial distribution of:
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- http://www.sciencedirect.com/science/article/pii/S0273117799009266 (Accessed 15.4.2014) (Open with school computer, the answer is here!)
- http://www.webpages.uidaho.edu/~vonw/pubs/WaldenEtAl_2010.pdf (Accessed 15.4.2014) (Continue here Timo)
- http://suzaku.eorc.jaxa.jp/GLI2/adeos/Project/Img.html (Accessed 15.4.2014)
http://www.sciencedirect.com/science/article/pii/S0273117799009266/pdf?md5=d94773c8e7a93436573522036217bdd1&pid=1-s2.0-S0273117799009266-main.pdf (Accessed 22.2014)Development and evaluation of the interferometric monitor for greenhouse gases: a high-throughput fourier-transform infrared radiometer for nadir earth observation. THIS NEEDS TO BE FOUND!