Wisconsin Alumni Research Foundation

Analytical Instrumentation, Methods & Materials
Analytical Instrumentation Methods Materials
Spectrographic Sensor for Precisely Measuring Gas Parameters in an Internal Combustion Engine
WARF: P07135US

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.
The Invention
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
Key Benefits
  • 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.
Additional Information
For More Information About the Inventors
Related Intellectual Property
For current licensing status, please contact Michael Carey at [javascript protected email address] or 608-960-9867