Maker：Tecnar

 

Tecnar’s TWM is a complete turnkey non-contact ultrasonic receiver unit that enables measurements with a flexibility not achievable with conventional systems. By using laser light to carry the information, the TWM enables ultrasonic inspection on moving and on hot components, hot materials and in harsh environments, even in vacuum conditions.

The TWM is based on real-time holography recording in a photorefractive crystal. The recording process enables the TWM to ‘filter out’ environmental noise and vibration without any active feedback process.

 

TWM Characteristics
Principle	Two-wave beam mixing in a photorefractive crystal
Low-frequency cut-off	Standard 700 kHz Option at different frequencies from 100 kHz to 5 MHz
High-frequency cut-off	Standard 40 MHz Option up to 100 MHz
Electronics	Programmable internal delay generator for triggering of data acquisition, pulsed generation laser and pulsed detection laser
Dimensions	Body: 483 mm x 476 mm x 266 mm Probe: 184 mm x 64 mm diameter

 

     TWM applications

• Online wall thickness measurement on hot steel
• Grain size measurement in metal under stress and thermal cycling
• Crack detection in difficult to access locations
• Low ultrasonic frequency analysis
• Defect detection in aerospace parts