文档介绍：O
OIL-BASED FUELS
See FUELS: Oil-Based
OPTICAL SPECTROSCOPY
Contents
Radiation Sources
Wavelength Selection Devices
Detection Devices
Stray Light
Spectroscopic Materials
Refractometry and Reflectometry
(NIR), and infrared (IR). Aspects of atomic spec-
Radiation Sources troscopy and scattering are covered elsewhere, as are
polarization and related effects.
C Burgess, Burgess Consultancy Co., Durham, UK
& 2005, Elsevier Ltd. All Rights Reserved.
Overview of Radiation Sources
This article is reproduced from the previous edition, pp. 3627–
3631, & 1995, Elsevier Ltd., with an updated Further Reading list Ideal spectroscopic sources should have a uniform
supplied by the Editor. high-energy output over a wide wavelength range
and be stable over long periods of time. In practice,
sources show marked wavelength dependence of
Introduction intensity although most sources are intrinsically sta-
ble provided that their power sources are stable.
Optical spectroscopy may be defined as covering that Broadly speaking spectroscopic sources may be
portion of the ic spectrum (EMS) from classified into two types: broad band or continuum
100 nm in the vacuum ultraviolet (UV) to 20 000 nm sources for absorption work and narrow band or line
in the infrared. The relative position of optical spec- sources for emission work. The latter category is
troscopy within the e