Considering the photothermal mechanism alone, the photoacoustic signal is useful in measuring the light absorption spectrum, particularly for transparent samples where the light absorption is very small.
42.
More advanced research has included optical techniques such as Multiphoton microscopy, Second-harmonic imaging microscopy, Photoacoustic tomography, nonlinear Raman spectroscopy, and diffuse optical spectroscopy.
43.
The photothermal mechanism manifests itself, besides the photoacoustic effect, also by other physical changes, notably emission of infra-red radiation and changes in the refraction index.
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The "'photoacoustic effect "'or "'optoacoustic effect "'is the formation of sound waves following light absorption in a material sample.
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Furthermore, photoacoustic measurements serve as a valuable research tool in the study of the heat evolved in photochemical reactions ( see : photochemistry ), particularly in the study of photosynthesis.
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They include such jawbreakers as nuclear quadrupole resonance and photoacoustic spectroscopy to training golden retrievers to sniff out mines or releasing genetically manipulated fruit flies that flock to the odor from the explosives.
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As with photoacoustic spectroscopy, photothermal spectroscopy is an indirect method for measuring optical absorption, because it is not based on the direct measure of the light which is involved in the absorption.
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"' 2014, Lihong Wang "', For pioneering photoacoustic tomography . Wang is Distinguished Professor of Biomedical Engineering at Washington University in St . Louis, USA.
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*Lihong Wang, Ph . D ., announces his work on photoacoustic imaging, a new technique that uses light and sound to create detailed, color pictures of tumors and organs.
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He is the editor-in-chief of the book series " Progress in Photothermal and Photoacoustic Science and Technology " which is published by the Society for Optical Engineering ( SPIE ).
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