TWI is the leading innovator in the field of Thermographic NDT and the premier solution provider for the most demanding applications in the aerospace, power generation and automotive industries. Building on a physics-based approach to signal processing, dedicated hardware development and application-specific algorithms and procedures, TWI has deployed state-of-the-art inspection solutions for the field, factory floor and large-scale advanced manufacturing around the world for over two decades.
TWI’s patented Thermographic Signal Reconstruction (TSR) method has been widely recognized as a breakthrough in the field of thermography. TSR performance for flaw detection far surpasses that of conventional approaches, which rely on detection of “hot spots” in the IR image sequence. While conventional thermography is adequate for some simple inspection tasks, it often lacks the accuracy, sensitivity and repeatability required to “meet or exceed” the performance of established inspection methods, such as ultrasound. Introduced by TWI in 2001, the TSR method addresses these limitations, and allows an unprecedented degree of sensitivity, depth range and resolution of subsurface defects. The introduction of TSR has played a significant role in the growth of thermography in real-world manufacturing and in-service inspection applications. In addition to flaw detection, the quantitative nature of TSR enables material characterization, including precise measurement of thickness, defect depth and thermal diffusivity in a wide range of composites, metals, polymers, ceramics and advanced materials.
Thermal Wave Imaging, Inc. has addressed the problem of flash “contamination” by developing hardware that allows precise control of flash duration and timing with respect to the integration time of the camera. The Precision Flash Controller is software controlled and it can be added to existing EchoTherm® or Thermoscope® systems. It truncates the actual plasma discharge and yields a near-rectangular pulse. As a result, saturation and early frame contamination can be eliminated in most cases.
This development has resulted in significant performance improvement of the Thermographic Signal Reconstruction® algorithm used in EchoTherm® and Thermoscope®, for both detection of deeper defects and quantitative measurement, and closer agreement of experimental data with model predictions.