Array Optics What is a transient thermoelastic expansion ?
Well, I have to explain how this biomedical device works: Laser Opto-Acoustic.
Opto-acoustic imaging technology combines optics and acoustics with a goal of improving the accuracy of the cancer diagnosis without the use of ionizing radiation (x-ray). The process starts by illuminating the tissue with laser light of specific wavelengths. Tumors preferentially absorb the light over normal tissue and become slightly heated. A transient thermoelastic expansion causes a tumor to emit a pressure (acoustic) wave. This acoustic wave is then detected by an array of sensors positioned around the periphery of the area of study.
Ok, I understand everything except the tissue-light interaction that cause the acoustic wave to be emitted. The tissue absorbs the laser light, which is energy. It heats, therefore it expands. Now, why does the energy is emited by acoustic waves ? Why not light ?
Can you help me ? Thank you so much.
email me on transformed.jp@gmail.com i'd love to help looking forward to ur email
Have a nice day
Optics gives a comprehensive and balanced account of traditional optics as well as some of the recent developments in this field while meeting the requirements of a course on optics meant for undergraduate students of science and engineering.
Filling a gap between too high-level, bulky academic books and technical articles in optics and photonic journals, this is an accessible textbook and tutorial for students and lecturers, as well as practitioners, designers, physicists, engineers and architects in the field of optics and illumination/non-imaging optics. As such, it covers all the basic and applied problems for the illumination optics community, including luminaire and lighting design from traditional light sources to LED, via optical platforms such as reflectors, condenser lens and lenlets array, lightpipe, and Fresnel lens. Using this approach readers learn the basic blocks for integration for later applications and development, while common schemes of illumination and classical illumination schemes are illustrated to provide simplified and well-proven approaches to creating initial designs and handling complex applications efficiently. The text also features end-of-chapter summaries and problems sets, appendices on patents, and a glossary, while a dedicated ftp site provides colored figures and TracePro/LightTools/ASAP codes.
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How to produce multiple image using optics or mirrors?
I need to know how to produce multiple image (in an array) in one screen using a projector. I am assuming multiples mirrors and optics lenses could be used but how I can project 9 image of the same picture in an array form (3 columns and 3 rows) and very close each other.
The easiest way it to do this electronically. Create 9 identical images at the object plane of your projector.
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