| 摘要 |
Moving glass tube wall thickness is measured by apparatus in which ultrasonic pulses are applied to the tubing and the time taken for a pulse to traverse the wall thickness is measured. The ultrasonic pulses are conducted through a fluid which is in contact at the end of a stationary open tube with the inner diameter of a sound transmitting rotating cylinder. The glass moves over and engages an outer diameter of the cylinder and the cylinder rotates as the glass tube moves over its periphery. Ultrasonic pulses then enter the tube and are reflected by its outer and inner diameter surfaces to produce thickness related to reflections of the sound energy.
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