SU1522145A1 - Method of recording optical information on photothermoplastic carrier - Google Patents

Abstract

The invention relates to methods for recording optical information on a photothermoplastic material. The invention improves the recording quality of optical information. A correlation comparison is made of the image to be restored with the recorded image in the correlator. The amplitude V _{R of the} output signal of the correlator is determined. The luminous flux of the reconstructed image is converted into an electrical signal of the intensity of the luminous flux V _I. FORM THE HEAT MANAGEMENT SIGNAL V _S proportional to the ratio of the signals V _R / V _I and regulate the thermal manifestation until the maximum signal level V _{S is} reached. AND

Description

The invention relates to a technique for optical information processing, primarily holography, and is intended for recording optical information in the form of holograms onto a photothermoplastic material.

The purpose of the invention is to improve the quality of the recording.

An apparatus for carrying out the method comprises an information output unit, a recording channel, a recording unit, an image recovery unit, a correlator, a conversion unit, a processing unit, and a thermal display mode control unit.

The method is carried out in the following manner.

The photothermoplastic carrier (FTN) is felt by applying a charge on the surface of FTN. On sentiment

the carrier exposes the recorded holographic image in the recording unit. As a result, an optical image f (x, y) is recorded on the FTN surface in a hologram frame. The amplitude distribution of the field E (V.V) on the surface is

E (V, Vy) Aexp (-j2 HVxXt,) + + F5 (Vx, V)

where A is the amplitude of the reference beam;

Hope depending on the angle

tilt of the reference wave. The amplitude transmission of the hologram, taking into account the nonlinearity of the recording medium, is a nonlinear exposure function.

ate

Yu

The cop

 sd

H (v). 5 | E (V, .Vy) dt.

As a result, while simultaneously reconstructing the image with the aid of the image recovery unit (coherent source of reducing radiation, Fourier transform lens and photoreceiver), the reconstructed image has the form

| 1

g tl i g-,

fft (x, y) K) E, g | AF (Vx, Vi,) l e

where E is the amplitude of the reducing radiation (assuming the spatial separation of the first order of diffraction and zero order in the reconstructed image). In the optical correlator, a correlation comparison of the reconstructed image fg, (x, y) and the recorded image s (x, y) is performed, at its output a mutually correlation function is recorded

40 "R (x, y) n f6 (x, y) f", (

-y, y) dx dy

VR

about

 f, (x, y) fj (x -x, y -y) dxV 5J | fe. (x.y) dxdy.

They are placed on the heat management mode control unit. In this case, the control of the thermal manifestation mode is carried out in order to maximize the signal Vc ,. The maximum of the signal V corresponds to the achievement of the maximum coincidence of the recorded and restored images, providing high accuracy. Formula 3

A method of recording optical information on a photothermoplastic medium, including sensing the carrier, its 50 exposure with a recorded holographic image, and thermal

() dVxolVy

The output signal of the optical correlator UN is proportional to R (x, y) and contains information about the degree of similarity between the restored rt recorded images.

A part of the luminous flux of the restored image is converted into an electrical signal of the intensity of the light-induced flux Vj, proportional to JJ (f (x, y) / dxdy, in the conversion unit (optical system and photocell). The obtained signals V and Vj are fed to the signal conditioning unit Vg (microprocessor). From the output of the processing unit, the control signal of the thermal development

For the purpose of forming a relief recording, characterized in that, in order to improve the recording quality, simultaneously with the appearance of holographically, the recorded and recorded image is restored, their correlation comparison in the correlator is formed, and proportional to the correlation value of the compared images. and normalized to the intensity of the recovered recorded image, the thermal development is stopped when the control signal reaches the maximum Go value.

Claims (1)

Formula m z gain A method of recording optical information on a photothermoplastic carrier, including sensing the carrier, exposing it with a recorded holographic image and thermal pro) f _J (x'-x ₎ y'-y) dx'dy ' y) | ² · dxdy phenomenon for forming a relief recording, characterized in that, in order to improve the recording quality, simultaneously with the development, the recorded and recorded image is holographically restored, their correlation is compared in the correlator, an electrical signal controlling the development is proportional to the correlation value of the compared images and normalized to the intensity of the restored recorded image, stop the thermal manifestation when the control signal reaches the maximum about meaning.