| Optical Characteristics of Quartz Crystal |
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Besides piezoelectric properties, quartz crystal also displays optical properties, notably, outstanding permeability, polarization and rotation over a wide range of wavelengths.
Advances in technology have made it possible to grow stable, high-quality synthetic quartz crystals, which have found a wide range of applications as an ideal optical materials.
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| Optical Low Pass Filter (OLPF) |
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Interference between light from an object entering the lens
of an optical imaging device and the arrangement of the photodiodes
can sometimes create a fine pattern of stripes. If the image
is printed "as is", an interference pattern known as "Moire"
is created, adversely affecting the picture quality.
An optical low pass filter (OLPF) has a property which separates light into ordinary and extraordinary optic rays and creates a double image. Building an OLPF into an optical imaging device reduces the stripes to a point where it is invisible to the naked eye, resulting in crisp and clear images.
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Digital Video Cameras (DVC) |
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Digital Still Cameras (DSC) |
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| Optical Low Pass Filter (OLPF) |
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 Principle of Quartz Crystal Optical Characteristic (Double Refraction Principle) |
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Structure of OLPF Used for DSC |
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Comparison of Interference Fringes (Moire Fringes) Removal |
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