The Navy has a need to measure temperatures at critical areas on large caliber gun inner bore surfaces to insure appropriate action is taken in case of a misfire. Inappropriate actions could result in the loss of life and the disabling of a naval warship. The authors have demonstrated the ability to measure the local internal surface temperature using ultrasonic sensors mounted on the external surface of a large caliber gun. In this study, the ability to measure local temperature on the internal surface arises from the unique structure of the rifled region. The temperature localization relies on the echo 'doublet' found in the rifled region. For the smooth bore region, determination of internal surface temperature and heat flux using a single interface echo in combination with inverse methods has been described elsewhere. For the rifled region, the theory and laboratory experiments suggest that the conversion of measured ultrasonic TOF data relies on a single material parameter, the velocity-expansion coefficient. Best overall temperature estimates are obtained by combining the through-the-wall TOF data with the measurements from the rifled section. The measurement method has been demonstrated on large caliber guns in a live-fire operating environment. The ultrasonic technique has sufficient temporal response and sensitivity to be used to improve gun safety in situations where auto-ignition is of concern.
Ultrasonic measurements of bore temperature in large caliber guns
Ultraschallmessungen der Lauftemperatur in großkalibrigen Geschützen
2008
8 Seiten, 7 Bilder, 8 Quellen
Conference paper
Storage medium
English
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