The lecture initially presents some basics on geometric optics and the microscopic treatment of atoms and molecules and their interaction with light, i.e., absorption and emission spectra. The latter means that – on a basic level of understanding – some fundamentals of quantum mechanics will be treated, that will lead to a better understanding of the laser diagnostic methods treated in later sections of the course. Furthermore, some basic knowledge on the physics and operation of various laser systems and detectors will be presented. Starting from there, the lecture provides an overview on various, mainly laser-based diagnostic methods for perturbation-free optical diagnostics in reactive systems aimed at the measurement of temperature, concentration and particle properties in the gas and (to a much smaller extend) liquid phase. The emphasis is on practical examples for the in-situ measurement of temperature, species (and particle) concentration, particle size and flow velocity in reactive flows. The lecture discusses the relevant signal generation processes in Rayleigh, Raman, Absorption, Laser-induced Fluorescence, Laser-induced Incandescence, and nonlinear optical diagnostics. Examples in practical applications of laser diagnostics in mixing and combustion processes are discussed.
The lecture „Laseroptische Messverfahren in reaktiven Systemen“ in some parts relies on the contents of the lecture „Quantitative bildgebende Messtechniken in Strömungen“, held by Prof. Sebastian Kaiser. Relevant parts of this lecture are recapitulated here. Therefore, it is not particularly relevant if this other lecture has not been attended; however, it may a somewhat deeper understanding of some technical details presented here.
Students will obtain some basic knowledge in geometric and wave optics. They will also understand the basics spectroscopic background and applications of modern laser-spectroscopic diagnostics for the spatially and temporally resolved, perturbation-free measurement in reactive flow processes. They also will learn about the variety of light sources, detectors and beam configurations necessary for performing for setting up suitable diagnostic experiments.