Accession Number : ADA180618

Title :   Asynchronous Optical Sampling for Laser-Based Combustion Diagnostics in High Pressure Flames.

Descriptive Note : Annual progress rept. 15 Sep 85-14 Dec 86,

Corporate Author : PURDUE UNIV LAFAYETTE IN SCHOOL OF MECHANICAL ENGINEERING

Personal Author(s) : King,Galen B. ; Laurendeau,Normand M. ; Lytle,Fred E.

Report Date : 15 DEC 1986

Pagination or Media Count : 31

Abstract : This report describes progress on the development of a new laser-based combustion dagnostic method for the quantivative measurement of both major and minor species in high pressure flames. The technique, Asynchronous Optical Sampling (ASOPS), is a state-of -the-art improvement in picosecond pump/probe laser spectroscopy. The ASOPS signal has been observed using a solution of rhodamine B in methanol as the sample. The response of the instrument was shown to be proportional to pump power, probe power, and sample absorptance. Different frequency synthesizers and different modes of triggering were used to study their effect on signal stability. Cavity dumpers and frequency doublers have been added to the instrument to prepare for the measurement of the hydroxyl radical in atmosphere laminar flames.

Descriptors :   *OPTICAL PROPERTIES, *FLAMES, *COMBUSTION, *LASER APPLICATIONS, ABSORPTION, ATMOSPHERES, LAMINAR FLOW, FREQUENCY SYNTHESIZERS, HYDROXYL RADICALS, CARBINOLS, POWER, PROBES, LASERS, ASYNCHRONOUS SYSTEMS, SAMPLING, FREQUENCY MULTIPLIERS, HIGH PRESSURE, DIAGNOSIS(GENERAL), POWER, PUMPS, INSTRUMENTATION, SPECTROSCOPY, SIGNALS, STABILITY, RESPONSE, STATE OF THE ART

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE