On-line non-contact measurement of the wall thickness of a glass reinforced composite pipe
A microprocessor-based monitoring system has been demonstrated for wall thickness dimensional measurement on glass reinforced composite pipes during their manufacture. The dimensions of the 12 m length pipes range in diameter from 0.5 m to 2.1 m and thicknesses from 5 mm to 30 mm. Measurements use the discontinuity properties of the composite by the combination of two methods. An eddy current method is used to measure the distance from the sensor to the metallic mandrel on which the composite materials are wound. An ultrasonic method uses the pulse-echo technique to measure the distance from the sensor to the external surface of the composite. Under laboratory conditions, a combination of the two methods enabled pipe thicknesses to be determined to an accuracy of +/- 30 microns. Under factory conditions the accuracy decreased to +/- 0.2 mm (static) and +/- 0.3 mm (dynamic).
Bibliographic Reference: Paper presented: IMEKO XIII World Congress, Torino (IT), September 5-9, 1994
Availability: Available from (1) as Paper EN 38140 ORA
Record Number: 199410378 / Last updated on: 1994-11-28
Original language: en
Available languages: en