US Patent 7403871 Extraction of imperfection features through spectral analysis

Autonomous non-destructive inspection equipment provides automatic and/or continuous inspection and evaluation of a material under inspection. The inspection equipment preferably comprises at least one detection sensor and at least one detection sensor interface for a computer. The autonomous non-destructive inspection system may also be retrofitted into conventional inspection systems by extracting pertinent features through spectral frequency analysis and sensor compensation and utilizing those features in the autonomous non-destructive inspection system.