This class discusses two-dimensional measurement techniques, which can be used to quantitatively and non-intrusively image physical and chemical properties in flows. For example, laser-induced fluorescence (LIF) can image the fuel concentration in the cylinder of an automotive engine. Measurement techniques, hardware (for example, camera technology), and image processing are discussed. In the accompanying lab (listed separately), students will set up and evaluate a classic experiment of turbulent fluid dynamics: a 2D measurement of the instantaneous concentration in a turbulent free jet. The students document experiment and result in a lab report.
Lecture and problem session:
1) Why use laser-based imaging in (reacting) flows?
Demonstration of a typical experiment in the lab.
2) Flow-imaging diagnostics: Method, applications, example.
3) Basic optics: Geometric optics, polarization, interference, filters.
4) Lasers: Physics, classes of lasers, laser components. LEDs.
5) Imaging: Resolution, lenses for imaging, aberrations.
6) Cameras and detectors: CCD, ICCD, CMOS, Photodiode, PMT. Sensor performance and noise.
7) Image processing: Photometric processing, filtering, statistical analysis
Laboratory (Fluorescence imaging in a turbulent jet):
Set up experiment
Acquire, process, and evaluate data
Eckbreth, Laser diagnostics for combustion temperature and species, Gordon and Breach, Amsterdam, 1996
Demtröder, Laserspektroskopie. Grundlagen und Techniken, Springer, Berlin-Heidelberg-New York, 2000