FUNDAMENTALS OF TRANSIENT THERMAL-LIGHT ABSORPTION SPECTROSCOPY AND APPLICATION TO OPTICAL SENSING IN HCCI ENGINES
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- Author(s)
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Hagen, Christopher L.
- Advisor(s)
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Sanders, Scott T.
- Date
- Jun 24, 2009
- Abstract
- A set of equations is developed for evaluating absorption spectroscopy based on thermal
emitters such as lamps. The noise sources considered are photon (shot) noise and beating
(wave interference) noise; signal-to-noise ratio limits for transient sensing with thermal
light are also defined as a result of the analysis herein.
The set of equations developed is used to evaluate three real absorption experiments: one
which uses a thermal emitter, another which uses an external cavity diode laser, and one
more which uses a supercontinuum source. In each experiment species concentration
measurements are made in a homogenous charge compression ignition engine.
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http://digital.library.wisc.edu/1793/35127
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