Hi, I'm also interested in the TMP006 spectral response
I'm working on environmental sensors to monitor atmospheric emitted radiance, so I'm particularly interested in the response of the TMP006 in the so-called "atmospheric window", between 7 an 14 microns
I understand that, considering how the sensor is built, it "looks" through a silicon layer (some hundreds of microns thick, I suppose, since the package is 0.6 mm), and that the provided spectral response curve comes mainly from the transmission properties of this silicon layer.
Now, for what I know the silicon infrared transmission curve has a sharp cut off between 1 and 2 microns due to band gap absorption, and then a phonon absorption band in the far infrared between 7 and 14 microns.
But, for a silicon layer some hundreds microns thick, the far infrared band should let pass still more than 40% of the incoming radiation, and the short wavelength cut-off should be lower than 4 microns... so I do not understand exactly the origin of the provided spectral response, that also appears very symmetric and smooth, like that of a bandpass filter (that, if I understand well, is not built in the sensor...)
thanks in advance, and best regards
Giovanni Bianchini
researcher, atmospheric physics
Istituto Nazionale di Ottica
Firenze, Italy
