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ULTRASONIC NONDESTRUCTIVE EVALUATION OF WOOD AND WOOD PRODUCTS- PAST, PRESENT AND FUTURE

机译:木材和木制品的超声波无损评估-过去,现在和未来

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Three generations of ultrasonic evaluation techniques for wood and wood products are presented, first (past), second (present), and third (projected future). The first generation involved a simple interpretation of a signal passing through the material of interest. The transition from first to second generation was largely from the advent of digital techniques and the ability to analyze specific and/or multiple features of received signals of different characteristics. For the third generation, a guided wave approach, nonlinear ultrasonic methods, and advanced on-line transducer assemblies are discussed, with emphasis on air-coupling techniques.
机译:介绍了用于木材和木制品的三代超声评估技术,第一(过去),第二(现在)和第三(预计未来)。第一代涉及对通过目标材料的信号的简单解释。从第一代到第二代的过渡很大程度上是由于数字技术的出现以及分析不同特性的接收信号的特定和/或多个特征的能力。对于第三代,讨论了一种导波方法,非线性超声方法和先进的在线换能器组件,重点是空气耦合技术。

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