Optical Instrument to Measure the Mass Concentration and Size Distribution of Smoke Particles

Period of Performance: 08/12/1998 - 08/12/2000


Phase 2 SBIR

Recipient Firm

Metrolaser, Inc.
22941 Mill Creek Drive
Laguna Hills, CA 92653
Principal Investigator

Research Topics


This proposal describes the development of a system to measure the mass concentration of soot particles in turbojet exhaust, in-situ and in real-time. The proposed system is simple in concept and will be easy to set up and use. It employs the laser induced incandescence technique which was shown under the Phase I effort to produce a signal almost linear with volume concentration of soot. The Phase I work will be extended to investigate and incorporate means of soot particle sizing into the final instrument. The large dynamic measurement range will give the systems broad market potential in a variety of industries attempting to measure and suppress particle pollution. The Phase II work will include: a) theoretical and laboratory studies to further improve LII signal linearity, b) design and development of zooming and scanning systems allowing measurement of soot concentration over a large area exhaust plume, c) development of control, acquisition and data analysis software, d) engineering design of a ruggedized system capable of working in the harsh enviroment of engine test cells, and e) building, testing and deployment of the system. The system will be a valuable asset to the Air Force's engine test facilities.