초록 ▼

A system for providing an image of an object from a coherent light signal transmitted from the object through a dynamic diffusive medium is provided with a planar surface receiving the signal wavefront, the received wavefront comprising an array of discrete picture elements. A local oscillator signa

A system for providing an image of an object from a coherent light signal transmitted from the object through a dynamic diffusive medium is provided with a planar surface receiving the signal wavefront, the received wavefront comprising an array of discrete picture elements. A local oscillator signal is mixed with each picture element in a selected order to provide light responsive signals which represent the distribution of power over frequency of each picture element, all of the frequency components of the light responsive signals being included in a first frequency range of selected bandwidth which is centered around an intermediate frequency. A narrow-band electronic filter receives each of the light responsive signals and removes all frequency components therefrom which are not included in a second, narrow, bandwidth centered around the intermediate frequency. An image of the object is provided by electronic apparatus which receives the filtered signals.

대표청구항 ▼

Optical heterodyne apparatus for extending the range at which a diffusive object may be viewed through a dynamic diffusive medium, said apparatus comprising: an array of discrete light responsive elements, each of said light responsive elements having a light sensitive surface and comprising means f

Optical heterodyne apparatus for extending the range at which a diffusive object may be viewed through a dynamic diffusive medium, said apparatus comprising: an array of discrete light responsive elements, each of said light responsive elements having a light sensitive surface and comprising means for generating an electric signal that represents the light impinging upon its light sensitive surface; lens means receiving a first coherent light signal transmitted from said object through said dynamic diffusive medium, an image of said object being carried upon the wavefront of said first coherent light signal, said first coherent light signal comprising frequency components which are included in a first frequency range of selected bandwidth which is centered at a first optical frequency, said lens means comprising means for focusing said first coherent light signal on said array of light responsive elements so that each picture element in an array of discrete picture elements comprising said carried image impinges upon the light sensitive surface of a different one of said discrete light responsive elements; means for providing a second coherent light signal of a second optical frequency, said first and second optical frequencies being different, said frequency difference being equal to an intermediate frequency; focusing means for focusing said second coherent light signal within an Airy disc upon the light sensitive surface of each of said discrete light responsive elements in a pre-selected sequence, each light responsive element generating a discrete heterodyne signal when said second coherent light signal is focused upon its light sensitive surface, each of said discrete heterodyne signals comprising an information component and a scatter interference component, the information component of the heterodyne signal generated by a given one of said light responsive elements representing the picture element of said image which impinges upon the light sensitive surface of said given light responsive element; means receiving said heterodyne signals for filtering said scatter interference components out of said heterodyne signals; means for directing the heterodyne signal generated by each of said light responsive elements to said filter means in said pre-selected order; means for synchronously operating said focusing means and said directing means so that said focusing means focuses said second coherent light signal within an Airy disc upon the light sensitive surface of a particular light responsive element when the heterodyne signal generated by said particular light responsive element is directed to said filter means by said directing means; signal exclusion means positioned between said array of light responsive elements and said filter means for preventing said filter means from receiving signals generated by any of said light responsive elements except the light responsive element upon which said second coherent light signal is focused; and means receiving filtered heterodyne signals from said filter means in said pre-selected order for enabling a viewable representation of said diffusive object to be provided.