| Description |
ix, 50 leaves : illustrations ; 29 cm |
| Summary |
"Monitoring the wall thickness of a refractory furnace while in operation is a difficult task due to the high temperature environment. Pulse-ultrasound is a nondestructive evaluation (NDE) technique that is commonly used to measure the thickness of a sample but is difficult to apply at elevated temperatures due to the lack of a high temperature transducer. An aluminum-nitride (AlN) transducer, that is capable of sustained temperatures up to 800°C in air, was tested. The results obtained from this study indicate that the combination of AlN transducers and pulse-ultrasound shows promise in monitoring a refractory wall at elevated temperatures. It was shown that the AIN transducer determined the thickness of a common glass contact ceramic sample up to ̃300°C with a less than an 18% error. One limiting factor preventing higher temperature measurements was the failure of the ultrasonic couplants between the transducer and the ceramic sample. The transducers could be redesigned to improve the signal quality"--Abstract, leaf iii. |
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