Spectrographic Sensor for Precisely Measuring Gas Parameters in an Internal Combustion Engine
Inventors: Scott Sanders
The Wisconsin Alumni Research Foundation (WARF) is seeking commercial partners interested in developing a device capable of accurately and quantitatively measuring gas temperature and concentration within a cylinder.
Although knowing gas composition and temperature in an engine combustion cylinder is important for engine research and development, current methods for obtaining this information are qualitative and imprecise.
A UW-Madison researcher has developed a device capable of accurately and quantitatively measuring gas temperature and concentration within a cylinder. The device includes a fiber optic light source installed in a spark plug. The fiber optic source introduces a light signal into the combustion space within the cylinder. A high-speed spectrographic sensor, such as a spatial heterodyne spectrometer, analyzes the strength of the light after it interacts with the combustion gases. A computer can then use this information to automatically determine gas temperature and water concentration, and to measure the absorption spectra of the combustion gases.
- Optimizing engines during research and development
- Measures gas concentration and temperature accurately and quantitatively
- Can be easily and non-destructively installed in an engine
- Light source may be a laser.
- Uses more than 100 spectrum colors to enhance accuracy
- Provides real-time, multi-spectral absorption measurements of combustion gases to accurately capture the dynamic process of combustion
- Eliminates the standard optical slit required of grating spectrometers, thus avoiding energy loss and allowing the rapid creation of high-resolution spectrographs
- Wavelengths of light between 2400 and 2600 nm are used because these wavelengths lack interference from species like CO2, and water vapor absorbs more strongly in this range.
- System is implemented through a fiber optic device installed in a spark plug, which is commonly used for in-cylinder testing.
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