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ANDSCAN Waveform Analysis Manual Download Dec 2003 (1.5 Mbytes) |
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Corrosion A-scan, B-scan, Depth scan & Pseudo-3D |
This software plug-in comprises a dynamic link library (DLL) that will interface to various full-waveform sources for acquisition, and can perform a wide range of analysis methods on that data in real-time or by post-processing the data. Files are stored in multi-page TIFF format to allow importing into other applications.
Basics
Gates (Interface and six other gates)
Measurements (up to 12 channels to store images
in)
Velocity
DAC
A-scans: Real-time waveform & Cursor waveform
B-scans: Horizontal, vertical and arbitrary cross-sections, TOFD
C-scans: Any of the following parameters plotted as a 2D map
Spectra: Amplitude and/or phase spectrum in whole waveform or chosen gate
Gate Amplitude (Full-wave, +ve 1/2-wave &-ve 1/2-wave rectified)
Gate Time-of-flight, TOF (Peak or Flank mode)
Ratio of Amplitudes in two gates
Difference between TOF in two gates
Integral in a Gate (area under waveform)
Rectified integral in a Gate (area under rectified waveform)
Energy in a Gate (area under the waveform squared)
Reflection and transmission coefficients from three gates
Choice of full waveform or any gate
Zero padding to chosen length
Windowing: Dirichlet, Bartlett, Parzen, Blackman, Hanning, Hamming, Welch & Gaussian
Filtering: Multi-order High-pass, low-pass, Gaussian (Log and Linear with frequency)
Gate Amplitude
Frequency of Peak in Gate
-6 dB Centre Frequency in Gate
RMS Surface Roughness: Ultrasonic Roughness Measurement pdf (Ultrasonic Roughness Paper - 3rd Aging Aircraft Conference pdf)
Attenuation as a function of Frequency (dB/MHz)
Attenuation as a function of Frequency squared (dB/MHz2)
Surface losses from extrapolation of Attenuation 0 Hz.
Reject level and adaptive gates to remove effects of noise.
DAC
Bandwidth limit (Digital low-pass filter)
Subtraction of memory waveform
Split Spectrum Processing
Deconvolution
External waveform processing (using 3rd party DLLs)
Numerous ‘windowing’ methods for FFTs
Versatile filtering of spectra
This plug-in will be commercially exploited through one or more licences, primarily with manufacturers of full-waveform acquisition sources. Other interested parties are invited to contact us. The following list gives the manufacturers with whom we are currently in negotiation:
NDTS Inc [USA and Canada]
