초록 ▼

Image derogating optical noise due to light scattering of an object under examination, embedded in, or positioned in front of a light scattering medium, is substantially reduced by employing a two-dimensional all optical phase sensitive holographic detector and vibrating the light scattering materia

Image derogating optical noise due to light scattering of an object under examination, embedded in, or positioned in front of a light scattering medium, is substantially reduced by employing a two-dimensional all optical phase sensitive holographic detector and vibrating the light scattering material at an ultra-sonic frequency to produce both signal sidebands and noise sidebands. Homodyne and hetrodyne techniques are used to filter out sidebands due to the light scattering noise and pass the desired signals, thereby to output a clear image of the object free of optical scatter noise. A smart pixel image converter light valve may be substituted for the photorefractive member.

대표청구항 ▼

Apparatus for retrieving an image of an object positioned in front of a light scattering medium comprising: (a) a real-time holographic storage member; (b) a beam source for generating a coherent reference light beam and for directing said reference light beam at said holographic storage member; (c)

Apparatus for retrieving an image of an object positioned in front of a light scattering medium comprising: (a) a real-time holographic storage member; (b) a beam source for generating a coherent reference light beam and for directing said reference light beam at said holographic storage member; (c) light directing means for passing a signal beam coherent with respect to said reference light beam through said object and through said light scattering medium in front of said object to produce a signal light beam emerging therefrom and directed at said holographic storage medium; (d) vibrator means for vibrating said light scattering medium at a frequency to produce a doppler shifted sideband having a center frequency higher than the bandpass frequency of said holographic storage member; and (e) read-out means for reading out said hologram from said holographic storage member for retrieving an image of said object substantially free of scatter noise.