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Surface wave velocity measurement using reflections from laser scribed grooves.

G R Gerhart¹, D Kolb

¹U. S. Army Tank R D, Warren, Michigan 48090.

The Review of Scientific Instruments

|September 1, 1978

Summary

Measuring ultrasonic surface wave (USW) velocity under stress is challenging. This study introduces a novel method using laser-scribed grooves and a single transducer, significantly improving accuracy by overcoming coupling variations.

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Area of Science:

Materials Science
Acoustics
Non-destructive Testing

Background:

Accurate measurement of ultrasonic surface wave (USW) velocity is crucial for material characterization.
The pulse overlap method (POM) is often hindered by externally applied stress, causing coupling variations and pulse distortions.
These distortions complicate the determination of the overlap condition, reducing measurement accuracy over extended stress ranges.

Purpose of the Study:

To develop an improved method for measuring ultrasonic surface wave (USW) velocity under applied stress.
To overcome the limitations of the pulse overlap method (POM) caused by coupling variations and stress-induced distortions.
To enhance the accuracy and reliability of USW velocity measurements in stressed materials.

Main Methods:

Adaptation of a single transducer configuration to both generate and detect USW, eliminating inter-transducer coupling variations.
Laser scribing two parallel, precisely positioned, and contoured grooves on the sample surface to create distinct overlap echoes.
Utilizing identical grooves for echo reflection, ensuring both echoes are affected similarly by coupling variations and distortions.

Main Results:

The single transducer configuration effectively eliminates coupling variations between multiple transducers.
The laser-scribed grooves provide reliable overlap echoes that are less sensitive to external stress.
The modified method significantly increases the accuracy of USW velocity measurements under applied stress compared to traditional POM.

Conclusions:

The proposed method offers a robust solution for accurate USW velocity measurement under stress.
By mitigating coupling variations and pulse distortions, the technique enhances non-destructive evaluation capabilities.
This advancement is vital for precise material property assessment in applications involving mechanical loading.