Provider: ingentaconnect
Database: ingentaconnect
Content: application/x-research-info-systems
TY - ABST
AU - Hirschfeld, T.
TI - Upper Boundaries to the Extent of the Jacquinot or Throughput Advantage in Fourier Transform Infrared Spectroscopy
JO - Applied Spectroscopy
PY - 1977-09-01T00:00:00///
VL - 31
IS - 5
SP - 471
EP - 472
KW - FT-ir spectroscopy
N2 - The typical Fourier transform infrared (FT-ir) spectrometer has a huge light gathering power advantage over grating spectrometers of similar resolution. This advantage, called the throughput or Jacquinot advantage, is given by

*T*
_{FT}/*T*
_{G} = 2π*F*/*l*

where
T_{
FT
} and T_{G} are the FT-ir and grating instrument throughput, and *F* and *l* are the focal length and slit height of the latter. For practical instruments T_{
FT
}/T_{
G
} ≈ 100 to 200. Here we have

*T*
_{FT}
= 2π*A*
_{M}/*R* = π^{2}/2 *d*
_{B}
^{2}/*R*

where A_{
M
} is the interferometer beamsplitter area, d_{
B
} its diameter, and *R* the resolution. At first glance it would appear that T_{
FT
}
can be enlarged for any given *R* by taking d_{
B
} up to its technological limit. Even higher throughputs are possible in field-widened FTS spectrometers.
UR - http://www.ingentaconnect.com/content/sas/sas/1977/00000031/00000005/art00016
M3 - doi:10.1366/000370277774463481
UR - http://dx.doi.org/10.1366/000370277774463481
ER -