منابع مشابه
All-Optical Scanning Acoustic Microscope
In this thesis a new instrument, the all-optical scanning acoustic microscope (O-SAM) is presented, it is a non contact scanning acoustic microscope (SAM) which uses lasers to both generate and detect surface acoustics waves (SAWs) The non contact nature of the O-SAM overcomes some difficulties associated with conventional SAMs because of the couplant and surface contact involved. This O-SAM al...
متن کاملRa Yleigh Wave Velocity Mapping Using Scanning Acoustic Microscope
In a Scanning Acoustic Microscope (SAM) amplitude of focused acoustic beam reflected by a sample is utilized to produce acoustic images and to measure local elastic property for effective nondestructive characterization of materials. The most important acoustic rays involved in both imaging and quantitative measurements in an acoustic lens are shown in Fig.l. The extra contribution to the refle...
متن کاملA scanning acoustic microscope discriminates cancer cells in fluid
Scanning acoustic microscopy (SAM) discriminates lesions in sections by assessing the speed of sound (SOS) or attenuation of sound (AOS) through tissues within a few minutes without staining; however, its clinical use in cytological diagnosis is unknown. We applied a thin layer preparation method to observe benign and malignant effusions using SAM. Although SAM is inferior in detecting nuclear ...
متن کاملAcoustic Neurinomas
Acoustic neuromas (AN) are schwann cell-derived tumors that commonly arise from the vestibular portion of the eighth cranial nerve also known as vestibular schwannoma(VS) causes unilateral hearing loss, tinnitus, vertigo and unsteadiness. In many cases, the tumor size may remain unchanged for many years following diagnosis, which is typically made by MRI. In the majority of cases the tumor is s...
متن کاملSubwavelength resolution in a transmission acoustic microscope configuration using fiber-tip sensors
Subwavelength resolution in a transmission acoustic microscope configuration is demonstrated using optical fiber-tip sensors as small-sized acoustic probes. A slit with a width of 1/20 of the acoustic wavelength L representing the object was detected with a lateral resolution of the outer fiber diameter which was '1/10 L, and with a proper signal-to-noise ratio. Fiber preparation techniques may...
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ژورنال
عنوان ژورنال: Zairyo-to-Kankyo
سال: 1993
ISSN: 0917-0480,1881-9664
DOI: 10.3323/jcorr1991.42.172