1.6 Electrical System
1-15
IRAffinity-1
After reaching the detector, the interferogram undergoes several treatments before being sent to the computer.
It is amplified by the preamplifier and the automatic gain amplifier, passes through high-pass and low-pass
filters, and is digitized by the 20-bit A/D converter. After the signal is digitized into the interferometer memory, it
travels through the USB 2.0 interface to the PC where IRsolution transforms the interferogram into a spectrum.
Fig. 1.10 Signal Processing System in the IRAffinity-1
1.6 Electrical System
DETECTOR
PRE
AMP
AUT
GAIN
AMP
HIGH
PASS
LOW
PASS
Sample
and Hold
A/D
Converter
Interferogram
USB
cable
Spectrum
GAIN setting signal
He-Ne laser fringe signal
Interferometer unit PC
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