Honeywell G.m.b.h.

Tzuo-Chang Lee

Jacob W Lin

Poohsan N Tamura

Enrique Bernal G

Michael F Braitberg

John D Skogen

John A Forss

Kuo H Chang

This invention pertains to an improved technique of introducing an added insulative layer between the thermoplastic layer and the photoconductive layer of the thermoplastic photoconductive holographic recording medium. The added layer (pure PVK) is electrically insulating at temperatures used for thermal development to prevent decaying charge contrast during hologram development.

Technique of introducing an interface layer in a thermoplastic

An optical system for creating the ambiguity function of a moving target is disclosed. The two signals which are to be used in the analysis are coded on spatial data masks as two-dimensional arrays of one-dimensional functions. The frequency scaling property of a post lens Fourier Transform is utilized to apply a variable scaling factor to at least one of the functions. This is accomplished by passing a beam of substantially coherent light through a cylindrical Fourier Transform lens before it passes through the data masks. At least one of the data masks is then set at an angle other than perpendicular to the beam path.

Holographic space-variant system for evaluating the ambiguity integral

An optical system which computes the ambiguity integral using one-dimensional spatial light modulators rather than the two-dimensional data masks or spatial light modulators used in the prior art is revealed. The coding is accomplished by compressing the light beam along one dimension, passing it through a one-dimensional spatial light modulator, and re-expanding the beam along the compressed dimension. The signal may be rotated to produce a linear dependence. In the preferred embodiment an acousto-optic cell commonly known as a Bragg cell is the one-dimensional spatial light modulator chosen.

High speed ambiguity function evaluation by optical processing

In a thermoplastic-photoconductor holographic recording medium in the form of several transparent layers over a transparent substrate, such as an optically transparent electrically conductive layer, then a photoconductor layer and a thermoplastic layer over such as glass or Mylar, a conventional material such as gold or platinum has been used as a transparent conductive layer. It is desired to use a less precious metal such as nickel-chromium (NiCr) as the conductive layer, however a limitation has been found in that an unwanted dark charge injection occurs from the NiCr to the photoconductive layer. This causes poor charge acceptance and therefore results in poor halogram formation. Herein a mono atom thick layer of the NiCr is treated and becomes on oxide layer which forms an effective charge blocking layer to dark charge injection.

Element for thermoplastic recording

Charge leakage can occur at a photoconductor-conductor electrode interface of a thermoplastic photoconductive holographic recording medium. This reduces the charge contrast and causes poor performance of the thermoplastic-photoconductive device. In the present invention there is provided a blocking layer of polyvinyl alcohol or polyvinyl butyral between the conductive layer and the photoconductive layer.

Polyvinyl blocking layer for preventing charge injection in a

A nondestructive dynamic controller for thermoplastic development is disclosed. The dynamic controller monitors the development of a hologram, without altering the charge pattern on the recording medium that is required for the development. The dynamic controller determines when optimum deformation has occurred in the developing recording medium and provides a signal which is used to shut off the thermal input used in the development.

Nondestructive dynamic controller for thermoplastic development

An electro-optic smoke detector is described which has an improved smoke chamber and detector construction to enhance the detector sensitivity in general and its response to small smoke particles in particular.

Electro-optic smoke detector

This invention pertains to an improved thermoplastic holographic recording medium having an added layer between the thermoplastic layer and the photoconductor layer. The added layer is electrically insulating at temperatures used for thermal development to prevent decaying charge contrast during hologram development.

Optics for a multi-track holographic tape recorder are disclosed. A multiplicity of one-dimensional page composers and passive optical means store the data in a multiple track format on a moving tape.

Optics for multi-track holographic tape recorder

In a holographic memory or a holographic recording system, one dimensional Fourier transform holograms are recorded on a moving memory medium. The one dimensional Fourier transform holograms have their elongated dimension oriented in a direction which is essentially normal to the direction of motion of the memory medium

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Bloomington, MN, United States of America

Tzuo-Chang Lee