| Ultrasonic Transducer |
| Although some specifications require the use of a focussed transducer, the author feels that sufficiently accurate results can be achieved using a collimated unfocussed transducer. |
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A collimator is a simple device for limiting the effect of beam spread and will give much greater resolution to immersion scans carried out using unfocused transducers. |
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| The image on the left shows a c-scan carried out using a standard 5MHz transducer, the image on the right shows the identical c-scan carried out with the addition of a 6mm collimator. Control of the beam spread by the collimator gives much greater resolution to the inspection results. |
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