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Leveling Equipment

Leveling Equipment

As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...

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Self-Test of Air-Coupled Probe for Sensitivity Map Production Using Parabolic Reflector.

Linas Svilainis, Jorge Camacho Sosa Dias, Darius Kybartas

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|July 15, 2024

Summary

This study introduces a self-inspection method for air-coupled probes using parabolic reflectors. While defects distort the acoustic beam, an aperture-limiting mask improves measurement quality for reliable probe integrity testing.

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Area of Science:

Acoustic testing
Non-destructive evaluation
Transducer technology

Background:

Probe integrity inspection is crucial for reliable performance.
Traditional methods may require expensive focused transducers.
Air-coupled transducers offer advantages in certain applications.

Purpose of the Study:

To develop a self-inspection technique for air-coupled probes.
To utilize a parabolic reflector for passive acoustic focusing.
To assess the feasibility of using the probe itself for integrity testing.

Main Methods:

Employing a parabolic reflector for passive acoustic wave focusing.
Using spread spectrum signals for transducer excitation to enhance signal-to-noise ratio (SNR).
Implementing an aperture-limiting mask to mitigate sidelobe effects.

Main Results:

Defect detection was achieved by observing distortions in the focused acoustic beam.
The initial sensitivity maps showed lower quality due to sidelobes caused by defects.
The aperture-limiting mask significantly improved measurement quality by reducing sidelobes.

Conclusions:

The parabolic reflector enables frequency-independent, self-inspection of air-coupled probes.
Defects manifest as beam distortions and sidelobes in the sensitivity map.
The aperture-limiting mask is an effective method for enhancing measurement accuracy in defect detection.