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Noncontact System for Dynamic Monitoring of Objects

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Noncontact System for Dynamic Monitoring of Objects

Tech Area / Field

  • INF-SIG/Sensors and Signal Processing/Information and Communications
  • PHY-OPL/Optics and Lasers/Physics

Status
8 Project completed

Registration date
26.02.2001

Completion date
10.07.2007

Senior Project Manager
Isakov S V

Leading Institute
St.Petersburg State University of Information Technologies, Mechanics and Optics, Russia, St Petersburg

Supporting institutes

  • VNIITF, Russia, Chelyabinsk reg., Snezhinsk

Collaborators

  • Fachhochschule Aalen, Germany, Aalen\nConsiglio Nazionale delle Ricerche / Instituto di Cibernetica, Italy, Arco Felice\nMinistry of International Trade and Industry / Agency of Industrial Science and Technology / Mechanical Engineering Laboratory, Japan, Tsukuba\nDe Montfort University, UK, Leicester\nZygo Corporation, USA, CT, Middletown\nInstituto Nazionale di Ottica Applicata, Italy, Florence

Project summary

The Project aims at increasing the validity of medical diagnostics and the quality of noncontact control of non-smooth and plastic surfaces features, e.g, human skin, non-destructive control of the condition of art subjects.

The Project is devoted to solving an imperative scientific-technological problem of noncontact optical testing of biomedical objects structure with three-dimensional reflection/ This also includes one under dynamic measurement mode, testing features of large non-smooth surfaces with complicated topography, e.g. of ancient subjects of art and providing quantitative description of the object’s condition.

Currently controlling the condition of biomedical objects, e.g. human skin, is being estimated upon indirect indicators due to the complicity of the structure control process with scattered three-dimension reflection. Control of the condition of art subjects, e.g. painting and sculpture subjects, small art forms, etc. is usually performed in long time periods or is not conducted at all due to absence of available technical means.

The proposed Project’s objective is to create a compact portable monitoring system for complicated objects, which provides the possibility of obtaining, collecting and processing information on the structure of objects, geometrical characteristics of large non-smooth surfaces, including surface topography, its deformations, shape deviations and subsurface three-dimension structure.

The monitoring system operation is based on the use of spectral and coherent radars schemes. These provide the measurement of the object’s characteristics in a wide deviation range and the object is tested with high sensitivity. The system includes a multi-channel optical interferometer illuminated by low-coherent light source and equipped with spectrometer in the spectral radar mode. It has a small-sized videocamera and it is controlled by a personal computer. The signal of each measuring channel represents a result of brightness transformation, signifying an evolution in the interferference field of each pixel from frame to frame. This depends on the selected wavelengh in the spectral radar mode or on the controlled change of optical path difference in the coherent radar mode. The system provides measurements in dynamic regime and possesses an increased noise-immunity due to the use of new recurrent algorithms for processing and filtering vector interferometric data.

The development’s scientific significance consists in researching and optimising the methods and structure of optoelectronic interferometry systems for noncontact testing and diagnostics of objects/ It is also significant that there will be developments in optimal noise-immune methods for obtaining, processing and analyzing measurement information.

The Head Institute’s scientific-technical and methodical potential of is based on its specialisation in the sphere of optical and computer technologies, its’ experience in developing noncontact testing of objects and combining fundamental and applied research, results in developing new mathematical methods applied to optoelectronic systems. A wide nomenclature of software developed by the Project’s participants for solving scientific and technical tasks, which have a bearing on the Project has been created and is being used.

The Project will provide the possibility of creating portable monitoring systems for objects with complicated structure and surface topography, applicable for serial manufacturing and use.

The Project realization is directed at developing technologies for peaceful aims, especially in the sphere of medicine, and for preserving valuable art subjects. It promotes the solving of national and international scientific and technological problems related to diagnosing the condition of complicated objects and supports the transfer to a market economy, thus meeting civil needs.

Expected Results:

The following results are expected to be obtained during the realisation of the Project:

– structure optimisation of an optical-electronic interferometric system for noncontact testing of optically rough and partially reflecting surfaces of complicated shape. The creation of a pilot model of a portable interferometric system for reconstructing surface topography of non-opaque objects, topography and subsurface layer structure (tomography) of partially reflecting objects by using the Markov nonlinear filtering method;


– development of elements of the Markov theory of optimal nonlinear filtering of stochastic interference fields and development of methods for optimal computer processing of vector interferometric signals with a dynamic estimation of the parameters of a two-dimensional interference field.

The research results will allow a widely applicable system to be created for noncontact dynamic monitoring of objects, e.g. in biology and medicine, and for at diagnosing the condition of valuable art subjects.

Scope of Work:

Duration of work – 2 years.

Planning,

1st year:

– selection of an optimal interferometric system structure for the modes of spectral and coherent radars’s modes;


– development of synthesis systems’s methods for optimal nonlinear recurrence filtering of images and the creation of a processing technique for recording images as they become available in real time;
– obtaining the algorithms in view of recurrent relations decreasing the volume of calculations and the required memory capacity;
– solution of a phase-unwrapping problem of stochastic interference fields.

2nd year:

– manufacturing a pilot sample of a portable interferometric system;


– investigation into the accuracy and noise-immunity of this method and algorithms;
– verification of the of the system’s quickness;
– analysis of optimal system operation modes for solving various problems in dynamic monitoring of objects.

This Project will let specialists who deal with the creation of nuclear and missile weapons to participate in the performance of the applied researches and development of technology for peaceful purpose, thus promoting international integration of scientists.


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