KEYWORDS: Signal detection, Digital video discs, Signal to noise ratio, Optical recording, Diffraction, Semiconductor lasers, Head, Optical discs, Servomechanisms, Sensors
Radial tilt adjustment method with Partial Response Signal-to-Noise Ratio (PRSNR) was newly developed. This method is able to adjust radial tilt rapidly, because the method uses the detected signal with polarity to radial tilt. Furthermore, the method has the accuracy of adjustment within ±0.1 degree, which is enough for HD DVD.
The first successful imaging by laser absorption computed tomography of
actual in vitro biological objects with two-dimensional resolution has been
achieved by means of Coherent Detection Imaging (CDT) method for noninvasive and
noncontact biomedical measurements. This novel method is based on the optical
heterodyne detection technique and the image reconstruction using the projection
slice theorem from sets of line integrals of laser absorption along a large
number of rays crossing the object with the parallel beam geometry.
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