Detection systems for scanning laser tomoholographic acoustic microscopy

✍ Scribed by A. Meyyappan; S. Isakson; F. Mendoza-Santoyo; R. A. Duarte; L. R. Sahagun; G. Wade

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 485 KB
• Volume: 7
• Category: Article
• ISSN: 0899-9457
• DOI: 10.1002/(sici)1098-1098(199622)7:2<131::aid-ima9>3.0.co;2-9

✦ Synopsis

A new microscope, called the scanning laser tomoholographic acoustic microscope, will employ three insonifying transducers to obtain holographic projections from three different directions for use in reconstructing tomograms of microscopic objects. To do this, the detection system should detect with equal sensitivity in all directions of propagation the traveling ultrasonic waves that emerge from the object with the image information. Two such laser-beam detectors, the heterodyne detector and the time-delay interferometric detector, have been examined to find the one best suited for rapid data acquisition and direction-insensitive optical computing. Although each has its own advantages and disadvantages, we find the latter more suitable for our purpose.