Browse Publications Technical Papers 2009-01-0655
2009-04-20

Hybrid Endoscopes for Laser-Based Imaging Diagnostics in IC Engines 2009-01-0655

Laser-based in-cylinder diagnostics are well established in engine research. The requirement of large-scale optical accesses, however, makes the application expensive and time consuming. It furthermore limits the engine operation range to low loads and speeds. We introduce laser excitation and imaging optics with a minimal outer diameter of 10 mm (imaging optic) respectively 9 mm (excitation optics). The imaging optics allow the observation of a 30×30 mm2 field with a working distance of 35-42 mm. In order to increase the optical performance diffractive elements are integrated. These elements provide great flexibility for the excitation beam shaping and help to reduce aberrations in the imaging system with a light throughput comparable to imaging setups with standard large-scale UV optics at the same image magnification. We present this miniaturized diagnostic technique based on fuel tracers for measuring fuel density, equivalence ratio and temperature in IC engines. A two-color detection scheme is applied for oxygen concentration measurements in gas jets and a flow-tagging approach for measuring flow velocities is demonstrated. Additionally, chemiluminescence and fuel concentration measurements in a production engine are presented. Finally, first results of an endoscopic LIF-based in-cylinder temperature measurement are shown.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Development of Nitrogen Components Analyzer Utilizing Quantum Cascade Laser

2009-01-2743

View Details

TECHNICAL PAPER

Fuel Film Temperature and Thickness Measurements on the Piston Crown of a Direct-Injection Spark-Ignition Engine

2005-01-0649

View Details

TECHNICAL PAPER

The Structure of Cavitation and its Effect on the Spray Pattern in a Single-Hole Diesel Nozzle

2001-01-2008

View Details

X