Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1980-10-07
1982-09-14
Levy, Stuart S.
Measuring and testing
With fluid pressure
Dimension, shape, or size
G01B 1306
Patent
active
043488897
ABSTRACT:
Pneumatic sheet thickness measuring apparatus includes a chamber to which air is supplied via a restriction, and a nozzle positioned adjacent a sheet to be measured via which nozzle air can escape from the chamber. The effective area from which air can escape with a sheet of nominal thickness is in the range of substantially 0.3 to 0.9, preferably 0.6, times the area of the restriction.
Air is also supplied to a second restriction, chamber and nozzle providing the same area ratio and the difference in the pressures in the two chambers is monitored with a differential pressure transducer.
The sheet to be measured is supported on a reference roller and the nozzle assembly is mounted above the roller on a carriage one end of which is carried by a bearing and the other end of which runs on a vertically adjustable rail. The horizontal distance from the bearing to the nozzle is substantially greater than the horizontal distance from the rail to the nozzle whereby inaccuracies in the bearing have relatively little effect on the vertical position of the nozzle.
REFERENCES:
pp. 142-145 of Engineering Metrology 3d Ed. (Metric) K. J. Hume, Publ. By MacDonalds Tech & Scientific.
pp. 248-251, Engineering Precision Measurements, Judge, Publ. by Chapman & Hall, 1957.
pp. 30-33, Metrology and Precision Engineering, Scarr, Publ. by McGraw-Hill, 1967.
Haynes Anthony C.
Unwin Derek K.
Levy Stuart S.
Roskos Joseph W.
Sussex Instruments Limited
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