Fluorescence imaging inside an internal combustion engine using tunable excimer lasers

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Applied Optics; (USA)

DOI:https://doi.org/10.1364/AO.29.002392· OSTI ID:7156849

Andresen, P; Meijer, G; Schluter, H ^[1]; Voges, H; Koch, A ^[2]; Hentschel, W; Oppermann, W ^[3]; Rothe, E ^[4]

---

1. Max-Planck-Institut fur Stromungsforschung, Bunsenstrasse 10, D-3400 Gottingen, Federal Republic of Germany (DE)
2. Laser-Laboratorium-Gottingen e.V., Robert-Bosch-Breite 10, D-3400 Gottingen, (Federal Republic of Germany)
3. Volkswagen AG Research Division, D-3180 Wolfsburg, (Federal Republic of Germany)
4. Wayne State University, Department of Chemical Engineering, Detroit, Michigan 48202 (USA)

Tunable excimer lasers are used to obtain 2-D images of molecular (and some state-specific) density distributions inside a cylinder of a modified four-cylinder in-line engine that has optical access. Natural fluorescence (i.e., without a laser) is used for some OH pictures, normal laser-induced fluorescence (LIF) for those of NO and of the isooctane fuel, and laser-induced predissociative fluorescence (LIPF) for other OH pictures and for those of O{sub 2}. Relevant spectroscopy is done to find the laser and fluorescence frequencies needed to measure isolated species. LIPF works well at high pressures, is state specific, and is ideally suited to follow turbulent processes. No similar measurements in engines have been previously reported. Pictures are taken in succeeding engine cycles. Their sequence is either at a particular point of the engine's cycle to show cyclic fluctuations, or at succeeding portions of the cycle to illustrate the progress of the gasdynamics or of the combustion.

• OSTI ID: 7156849
• Journal Information: Applied Optics; (USA), Journal Name: Applied Optics; (USA) Vol. 29:16; ISSN 0003-6935; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
AUTOMOTIVE FUELS
CHALCOGENIDES
CHEMICAL ANALYSIS
COMBUSTION PRODUCTS
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
ELEMENTS
ENGINES
FUELS
HEAT ENGINES
HYDROXYL RADICALS
IGNITION
INTAKE
INTERNAL COMBUSTION ENGINES
LASER RADIATION
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PERFORMANCE
RADIATIONS
RADICALS