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Multiple Beam Spectoscopy for Liquid Rocket Engine Diagnostics

Science Research Laboratory, Inc.

Sommerville, MA 

A non-intrusive optical technique for measuring velocity of luminous gases

• An image of the gas was divided into narrow strips and directed into alternate photodetectors. The frequency difference of the two measured light intensities shows the gas velocity
• An instrument using tranmission gratings and a new three-cube beamsplitter was engineered, fabricated and tested in Phase11
• Complete instrument, and calibration equipment delivered to NASA Glenn for study of rocket engine exhausts

• An instrument is on loan to microcoating Technologies, who are marketing a novel combustion coating system for possible inclusion in the control system of their product
• Instrument based on the same principle is being fabricated for the Federal Highway Administration (FHWA)

• Based on this SBIR an instrument was fabricated and delivered to the Plasma Fusion Center at MIT and used for diagnostics on the Alcator Tokamak
• The Technique has been extended to nonluminous gases. Such measurements were made for NASA Langley and for Arnold AFB. SRL has now proposed to deliver a velocimeter to the FHWA to map the air flow in their wind tunnel

Return to NASA SBIR Success Listings