SU1310624A1 - Method of determining parameters of diffuse objects - Google Patents

Abstract

The invention relates to a measurement technique, mainly to methods for determining parameters of diffuse objects using holographic and speckle interferometry. The aim of the invention is to increase the information content by providing the possibility of obtaining an interference pattern in real time. The object 8 is illuminated with coherent radiation from laser 1 and the radiation reflected from the object in its original state by means of lens 3 is focused into the plane of the photo-recording medium 5. This medium 5 is illuminated with a reference beam of coherent linearly polarized radiation and a hologram of the focused image of the object is recorded. The polarization plane of the reference beam is changed by 90 °, the image of the object is restored from the hologram, and the coherent radiation reflected from the object in an altered state is focused into the photorepository 5 plane. Then the radiation is filtered through a Fourier lens 6 and the interference pattern in the .7 plane, by which the parameters of the object are determined. 1 il. i (L from 05 th

Description

The invention relates to a measurement technique, mainly to methods for determining parameters of diffuse objects using holographic and speckle interferometry.

The aim of the invention is to increase the information content by providing the possibility of obtaining an interference pattern, according to which the parameters of the object are determined in real time.

The drawing shows an optical scheme for implementing the method.

The diagram shows a laser 1, a beam splitter 2, a lens 3 forming an object image, an electro-optical element 4, a photo-recording medium 5, a lens 6, position 7 designates the plane of registration of the interference pattern, position 8 - the object under study.

The proposed method is carried out as follows.

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from the object in an altered state, into the plane of the photoregistered medium, and in real time using a lens 6; Fourier filtering of the radiation propagating beyond the plane of the photoregistration medium 5. The interference pattern obtained by Fourier filtering is recorded in the plane 7 and determined on it the parameters of the diffuse object 8.

Claims (2)

Invention Formula The method of determining the parameters of diffuse objects, which consists in illuminating an object with a beam of coherent linearly polarized radiation, focuses the coherent radiation reflected from the object in its original state into the plane of the photorecording medium, focuses the coherent radiation reflected Illuminate object B with a coherent beam 20 from an object in an altered state, in planarly polarized radiation from laser 1, and focus coherent radiation through objective 3 into the plane of the photorecording medium 5. Light the photorecording medium 5 with a beam of coherent linearly polarized radiation obtained by dividing the output radiation laser 1 using beam splitter 2. The hologram of the focused image of object 8 is recorded on the photo-recording medium 5. Then the plane of polarization of the reference beam is changed by 90 ° using an electro-optical element 4 and the image recorded on the hologram is reconstructed with the resulting beam. Focus coherent radiation, reflected 25 thirty The bone of the photoregistration medium performs Fourier filtering of the radiation propagating behind the plane of the photoregistration medium, and an interference pattern is obtained which determines the parameters of the object, characterized in that, in order to increase the information content of the method, before focusing the radiation reflected from the object in the modified condition, illuminate the photo-recording medium with a reference beam of coherent linearly polarized radiation, record the focused radiation on the photo-recording medium, and change the area the sharpness of the polarization of the reference beam by 90 ° relative to the original alias. Compiled by V. Bakhtin Tehred I. VeresKorrektor M. Sharoshi Circulation 678 Subscription VNIIPI USSR State Committee for the De. Pp. Inventions and discoveries 1 13035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 0 five from the object in an altered state, into the plane of the photoregistered medium, and in real time using a lens 6; Fourier filtering of the radiation propagating beyond the plane of the photoregistration medium 5. The interference pattern obtained by Fourier filtering is recorded in the plane 7 and determined on it the parameters of the diffuse object 8. Invention Formula The method of determining the parameters of diffuse objects, which consists in illuminating an object with a beam of coherent linearly polarized radiation, focuses the coherent radiation reflected from the object in its original state into the plane of the photorecording medium, focuses the coherent radiation reflected 0 from an object in an altered state, in the planes of an object in an altered state, in a flat The bone of the photoregistration medium performs Fourier filtering of the radiation propagating behind the plane of the photoregistration medium, and an interference pattern is obtained which determines the parameters of the object, characterized in that, in order to increase the information content of the method, before focusing the radiation reflected from the object in the modified condition, illuminate the photo-recording medium with a reference beam of coherent linearly polarized radiation, record the focused radiation on the photo-recording medium, and change the area the sharpness of the polarization of the reference beam by 90 ° relative to the original alias.