6.3 What's Happening?
6-7
IRAffinity-1
6.3.3 A Part of the Mirror Is a Little White.
Phenomena
1. A Part of the Mirror is a little white.
Reason
1. It seems to be the result of the heat of the infrared light source for an extended time.
Solution
Conduct the performance check according to the section 5.1.1.3 or the section 5.1.1.4.
If this specification is satisfied, there is no problem for the measurement and you can continue
to use it.
If not satisfied, execute the [Measurement]-[Auto Adjust] once, then perform the performance
check again.
The mirror in the interferometer may become opaque after being used for a long time. This is
caused by the heat of the light source. Usually, however, this doesn't cause a problem in a
measurement of μm order in the infrared wavelength region.
The FTIR spectrophotometer has several mirrors inside. Never wipe the mirror surface with cloth or
cleaner even if these mirrors are contaminated with dust. It may damage the mirror surface and
lower the intensity of the infrared signal (the influence is especially large in the short wavelength
region), resulting in an adverse effect to the measurement.
CAUTION
If vapors of any organic halide, such as difluoromethane (CH
2
F
2
), dichloromethane (CH
2
Cl
2
),
chloroform (CHCl
3
), or carbon tetrachloride (CCl
4
) enter the interferometer, they are
decomposed by the heat of the light source to highly caustic hydrogen halides such as
Hydrofluoric acid (HF), Hydrochloric acid (HCl), etc. Mirrors, other optical elements, screws and
another parts in the interferometer might be damaged. Please prevent the entry of organic halide
vapors into the interferometer by installing a local ventilation system at the FTIR sample
compartment, or purging the interferometer with dried air or N
2
gas, when you run samples that
include volatile organic halide compounds.
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