B-1628
Optical Multi-Channel Interferometer for Laser Ultrasonic Inspection Systems
The purpose of the project is to create two models of multi-channel laser optoacoustic defectoscopy on the basis of hetero-dyne interferometer and adaptive interferometer using photo-electromagnetic force (photo-EMF) sensors in conditions of local impulse laser excitation of ultrasound in solids and multi-channel registration of the surface vibration with the subsequent reconstruction of internal defects and heterogeneities. On the basis of analysis of experimental data received during the process of the comparative testing of both types of interferometers the development of optical-physical scheme of a device prototype is planned, which is suitable for operating in industrial environment.
The State of the Art
The development of laser-acoustic non-contact methods for controlling a quality of solid-state products made of various materials (metals, semiconductors, crystals, multilayered structures, etc.) is one of the basic areas of research activity of the International Scientific Laboratory for Optical Diagnostics (ISTC-ISL-LOD). Considerable progress in laser acoustics has been achieved by the ISL-LOD employees during the fulfillment of the ISTC B-1065 Project and related the ISTC B-1297р Partner Project.
Recently in the area of non-destructive testing a special attention is given to the development of entirely non-contact methods of ultrasound excitation in investigated solid-state objects and registration of the information on the internal heterogeneities, defects and cracks. One of the most promising methods in this area is laser excitation of acoustic waves and registration of the useful information by various methods of modern laser interferometry. The advantage of such method has been convincingly demonstrated with a number of experimental investigations, as well as within the framework of the ISTC B-1297p Partner Project titled “Study on the Design of Laser-Acoustic Phased Array Transducer”.
The realization of the proposed project will allow one to develop and manufacture an advanced prototype of laser-acoustic defectoscope available for operation in industrial environment.
Impact of the Project on the Progress in the Field
The development of techniques and devices intended for non-contact ultrasonic defectoscopy based on laser pulsed excitation of cylindrical ultrasonic waves in solid-state samples and interferometric registration of information from a sample’s surface permits one to improve essentially the quality control of products in industry and facilitate characterization of internal heterogeneities of composite materials or products of complicated (for instance, laminated) structure.
Competence of Project Participants
Twenty nine participants will take part in the Project. The scientific team involves 4 Doctors of Sciences in Physics and Mathematics, 1 Doctor of Sciences in Engineering, 8 Candidates of Sciences in Physics and Mathematics and 13 persons with a higher education. The majority of them are specialists in laser physics, optics, acoustooptics, radio electronics and computer engineering. Most of the leading Project participants have a broad experience in development of «weapons» connected with laser-based navigation system of aircrafts. During the last years the Project participants have worked actively in the field of laser interferometry, acoustooptics and technical acoustics.
Meeting ISTC Goals and Objectives
The Project fully meets the objectives of the ISTC on providing an opportunity for weapons scientists, engaged into the Project, to redirect their skills and experience to the peaceful activity.
The Project will encourage their endeavors to enter the area of manufacturing instrumentation for defectoscopy of different types of industrial samples, which are widely used in metallurgy, machine-building and microelectronics by EU and Belarus manufacturing enterprises (Belarusian Metallurgical Plant, Minsk Motor Plant, Minsk Automobile Plant, Minsk Tractor Plant, the plant “Centrolit” and so on).
In addition to the technological advance the successful realization of the Project will have a notable social impact by creating new working places, grown prestige and significance of science for current technology market and industrial production.
Expected Results and their Application
In the course of implementation of three project tasks, the following results will be obtained:
The Project duration will be 2 years. The total amount of efforts will be 6294 person-days. Within the scope of the Project, it is planned to develop and create two interferometric prototypes with different physical principles of registration of surface vibrations of solids under the influence of ultrasound excited by the impulse laser radiation. Also, math models and numerical simulation of physical processes of laser excitation of ultrasound and its interaction with internal scatterers will be performed; as well as methods of reconstruction of the internal structure of tested objects will be elaborated and pilot devices of defectoscope will be created.
Role of Foreign Funding Collaborator
The following forms of cooperation with the foreign Funding Collaborator (Fraunhofer IZFP) are planned:
The technical approach and the methodology are based on the many years experience of the Project participants in the areas of laser physics, heterodyne interferometry, photorefractive and nonlinear optics, acoustooptics, radio electronics and computer engineering. The complete fulfillment of the Project will include numerical simulation and modeling, creation of two pilot devices (on the basis of heterodyne interferometer and adaptive interferometer with using photo-EMF sensors), making experiments, comparison and analysis of models characteristics, choice of optimal optical-physical scheme for the device construction that is feasible to work in the industrial environment.
