Assistance technique

Introduction aux ultrasons multiéléments

This two-day course is designed to introduce engineers, managers and inspectors to the principles and advantages of the rapidly emerging phased array technology.
The course covers the following:

History of Phased Array

• The early days, 1950's - 1970's
• Principles of early array excitation
• Contemporary medical media
• Contemporary industrial PA instruments
• Contemporary applications for PA

Digitization Principles for Phased Array

• Advantages of digital recording
• Digitization of analog wave forms
• Digital amplitude
• Phased Array digitizer
• Points of amplitude on a sine wave
• Correct digitization rate selection
• Digitization of rectified 'A' scan signals
• Digitization of rectified 'RF' scan signals
• Sampling rates
• Time periods
• Samples / period
• Minimum sampling rates
• Errors in sampling
• Optimum sampling rates
• Pulse types
• Pulse width
• Signal averaging
• Element excitation
• Focal Laws
• PRF and Scan speeds
• PRF errors
• Operating frequency and bandwidth
• Using band pass filters
• Using video smoothing filters
• Grey scale palettes and TOFD images
• Phased Array images using RF waveform
• Phased Array images using color palettes
• Swept angle imaging (Sectorial scans)
• Data collection rate and using encoders
• 'S' Scan images (Time depth and half path)
• 'B' Scan images
• 'C' Scan images
• Multiple view imaging

Principles of Phased Array

• What are Phased Arrays?
• Why use Phased Arrays?
• Phased Array terminology
• How Phased Arrays work
• Probe design parameters
• Composite probe technology
• Linear (1D) probes
• Inclined beam probes
• Focused beam probes
• Electronic scanning probes
• Linear probe sectorial scanning
• 2D matrix probes
• 1D annular arrays
• 2 D sectoral annular arrays
• Daisy arrays
• Wrapped scanning
• Wave forming fundamentals
• Beam steering (Emission and reception)
• Focal law calculations
• Dynamic depth focusing
• Weld scanning
• Tandem scanning
• Array selection
• Frequency selection
• Element size
• Element numbers
• Element power
• Pitch /aperture
• Array lobe issues
• Design issues

OmniScan™ Orientation Presentation

• Explore around the equipment
• Modular concept and specifications
• Data presentation options
• User - interface options
• Menus (full description of each menu)

Applications of Phased Array

• Pipeline inspection
• PipeWIZARD
• SCC sizing
• Military tank inspection (call this one "Shafts and Bolts")