The appropriate timing for imaging an object was discovered for a half-cycle terahertz (THz) pulse generated from a large-aperture photoconductive antenna. Two-dimensional THz imaging with single-shot detection was conducted. This enables observation of ultrafast phenomena at a frame rate of 1000 frames/s. ©2003 Optical Society of America OCIS codes: (320.7120) Ultrafast phenomena; (110.2970) I...

In the first half of the article, inspection organization and programs are briefly dealt with. This is followed by a more detailed review of inspection, detection and monitoring methods, which comprises visual inspection, radiography, ultrasonic testing, eddy current technique, magnetic particle inspection, the use of liquid penetrant, the electric field signature method, acoustic emission, lea...