Accession Number : ADA334572

Title :   Advanced Diagnostics for Reacting Flows

Descriptive Note : Final technical rept. 1 Nov 94-31 Oct 97

Corporate Author : STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Hanson, Ronald K.

PDF Url : ADA334572

Report Date : 19 DEC 1997

Pagination or Media Count : 33

Abstract : Progress is reported for the past three years of a research program on advanced diagnostic techniques for combustion gases and plasmas. The techniques studied are based on laser spectroscopy, particularly spectrally-resolved absorption and laser-induced fluorescence. Laser sources include tunable cw diode lasers and tunable (or fixed-frequency) pulsed lasers. The cw lasers are spectrally narrow, allowing study of innovative techniques based on spectral lineshapes, while the pulsed lasers provide intense bursts of photons needed for techniques based on light-scattering phenomena. Accomplishments of note include: successful development of wavelength-multiplexing schemes which allow diode laser absorption measurements of multiple flow parameters along a common optical path; the first application of frequency-doubled diode lasers for combustion species measurements; establishment of a simple and sensitive means of imaging temperature in flows of air seeded with acetone; innovation and validation of a fluorescence-based plasma diagnostic for static pressure and kinetic temperature; and development and demonstration of a new class of sensors, based on multiplexed diode laser absorption, for near-real-time combustion control.

Descriptors :   *LASER INDUCED FLUORESCENCE, *PLASMAS(PHYSICS), *PLASMA DIAGNOSTICS, LIGHT SCATTERING, TUNABLE LASERS, AIR FLOW, HIGH PRESSURE, PULSED LASERS, LASER BEAMS, GAS DYNAMICS, LASER APPLICATIONS, COMBUSTION STABILITY, STATIC PRESSURE, CONTINUOUS WAVE LASERS, COMBUSTION PRODUCTS, DIODE LASERS.

Subject Categories : Lasers and Masers
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE