文档介绍：1/22
Instrumentation
(a) Dispersive infrared spectrometers
Double beam mode
The source emits radiation over the whole IR
region (a black body source (globar))
Use more than one monochromator:
同济大学《材料研究方法》精品课程 1/22
Instrumentation
2/22
Instrumentation
(b) Fourier transform spectrometers
Whole infrared region
FTIR instruments have largely replaced the
traditional double beam instruments.
Higher singal-to-noise pared to
dispersive instruments
Capability plex data handling
Also permit investigation of transient
structural changes during deformation of
polymers
同济大学《材料研究方法》精品课程 2/22
3/22
Instrumentation
(b) Fourier transform spectrometers
High intensity mercury
lamp or heated wire
Michelson (continuous spectrum)
interferometer
Two
mirrors,
one
fixed
and one
movable
同济大学《材料研究方法》精品课程 3/22
4/22
Instrumentation
布鲁克光谱仪器公司
4/22
5/22
Instrumentation
(b) Fourier transform spectrometers
同济大学《材料研究方法》精品课程 5/22
Instrumentation
constructive
interference.
destructive
interference
oscillatory
pattern or
interferogram
6/22
Instrumentation
(b) Fourier transform spectrometers
constructive
interference.
destructive
IR
interference source
oscillatory
pattern or Sample
interferogram
同济大学《材料研究方法》精品课程 6/22
Instrumentation
mirrors are located
equidistant,the optical
path difference is an
Integral number of
wavelengths
the reflected beams are
in phase
produce constructive
interference
7/22
Instrumentation
(b) Fourier transform spectrometers
mirrors are located
equidistant,the optical
path difference is an
Integral number of
wavelengths
the reflected beams are
in phase
produce constructive
interference
同济大学《材料研究方法》精品课程 7/22
Instrumentation
the optical path
difference is an odd
number of half
wavelengths
destructive interference
8/22
Instrumentation
(b) Fourier transform sp