- #1
paul_harris77
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Dear All
I am trying to measure the spectrum of an incandesant 6V 15W tungsten microscope lamp. I have a reasonably old scanning monochromator (diffraction grating based) coupled to a fibre optic cable and it has given me the spectrum below.http://dl.dropbox.com/u/15546679/silver_lamp_forum.png I think it maybe broken as I am having a hard time believing that it gives virtual no output at 900nm. Surely all standard tungsten bulbs give out significant radiation at 900nm-1000nm (NIR)? I know it depends on the temperature of the filament and hence the colour temperature, but from most graphs I have seen of tungsten bulbs (2000-3300K), they have spectrums that extend significantly into the 900nm+ NIR region. Unfortunately, I can not find the colour temperature of the bulb, but it is definitely a yellow light so probably in the region 2000-3000K.
Does anyone else think that the spectrum maybe incorrect and that the monochromator may be broken or be attenuating the spectrum significantly in the 700-900nm region?
Many thanks
Paul
I am trying to measure the spectrum of an incandesant 6V 15W tungsten microscope lamp. I have a reasonably old scanning monochromator (diffraction grating based) coupled to a fibre optic cable and it has given me the spectrum below.http://dl.dropbox.com/u/15546679/silver_lamp_forum.png I think it maybe broken as I am having a hard time believing that it gives virtual no output at 900nm. Surely all standard tungsten bulbs give out significant radiation at 900nm-1000nm (NIR)? I know it depends on the temperature of the filament and hence the colour temperature, but from most graphs I have seen of tungsten bulbs (2000-3300K), they have spectrums that extend significantly into the 900nm+ NIR region. Unfortunately, I can not find the colour temperature of the bulb, but it is definitely a yellow light so probably in the region 2000-3000K.
Does anyone else think that the spectrum maybe incorrect and that the monochromator may be broken or be attenuating the spectrum significantly in the 700-900nm region?
Many thanks
Paul
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