This thesis was submitted at the physics department, Karl Franzens University of Graz, Austria, to achiev the degree Master of sience (M. Sc.).
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- Robert Nuster (Mag. Dr.rer.nat.)
- Günther Paltauf (Ao.Univ.-Prof. Mag. Dr.rer.nat.)
In search of new contrast mechanisms, the Grueneisen relaxation photoacoustic microscopy (GR-PAM) emerged in the field of photoacoustic microscopy. In this thesis the underlaying effect, where the amplitude of the photoacoustic pressure wave changes due to a preheating, is proven. Furthermore, a comparison of GR-PAM to conventional optical resolution photoacoustic microscopy (OR-PAM) is done. Additionally, a compact version of an optical ultrasonic transducer, based on a Fabry–Pérot interferometer, is constructed and built.
- Introduction
- Principles of photoacoustics
- Photoacoustic effect
- Generation and propagation of photoacoustic waves
- Photoacoustic microscopy
- Grueneisen relaxation photoacoustic microscopy (GR-PAM) theory
- The Grueneisen effect
- Dual pulse technique
- Resolution considerations
- Experimental results of photoacoustic microscopy
- Proof of the Grueneisen effect
- Experimental results of GR-PAM
- Topographical analysis of OR-PAM images
- Optical ultrasonic detection (OUSD)
- Principle of optical ultrasonic detection
- OUSD setup
- System development
- Cutoff frequency estimation
- Measuring-methods to determine the ultrasonic pressure
- Experimental results of the optical ultrasonic detection system
- Finesse
- Transferfunction
- Conclusion
- Appendix