Temperature-compensated ultrasonic measurement of wall thickness
AssigneeSiemens Aktiengesellschaft
InventorsJoachim Baumann, Peter Graf
Life of this patent
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Abstract
An apparatus for measuring the thickness of a tubular plastic layer during the process of its fabrication, which includes an ultrasonic transducer which generates a signal dependent on the thickness of the shape being measured while the shape is at a non-uniform condition of temperature, and circuitry for generating at least one signal from known process parameters, and an arithmetic unit for processing the signals derived as described above to generate an error signal which compensates for the influence of temperature on the test.
Claims5
A temperature compensated apparatus for non-destructive, non-contacting ultrasonic measurement of wall thickness of an extruded plastic tubular shape which comprises:
- an extruder forming said plastic tubular shape,
- an ultrasonic transducer providing means for generating a first signal dependent on the thickness of said shape while said shape is at a non-uniform condition of temperature,
- a liquid cooling means directly downstream from said extruder,
- means for generating a second signal depending on at least one process parameter, and
- an arithmetic means processing the first and second signals to generate an error signal which compensates for the influence of temperature.
Dependencies are inferred from the claim text.