FUNDAMENTALS OF TRANSIENT THERMAL-LIGHT ABSORPTION SPECTROSCOPY AND APPLICATION TO OPTICAL SENSING IN HCCI ENGINES
Date
2009-06-24Author
Hagen, Christopher L.
Advisor(s)
Sanders, Scott T.
Metadata
Show full item recordAbstract
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.