Instrument for measurement of vacuum in sealed thin wall packets

Details Instrument for measurement of vacuum in sealed thin wall packets Instrument for measurement of vacuum in sealed thin wall packets

1992-01-27

1993-10-05

Williams, Hezron E.

Measuring and testing

With fluid pressure

Leakage

73 52, 738665, 356373, G01M 302, G01M 338

Patent

active

052494543

ABSTRACT:
An instrument for the measurement of vacuum within sealed packets 12, the packets 12 having a wall 14 sufficiently thin that it can be deformed by the application of an external vacuum to small area thereof. The instrument has a detector head 18 for placement against the deformable wall 14 of the packet to apply the vacuum in a controlled manner to accomplish a limited deformation or lift of the wall 14, with this deformation or lift monitored by the application of light as via a bifurcated light pipe 20. Retro-reflected light through the light pipe is monitored with a photo detector 26. An abrupt change (e.g., a decrease) of retro-reflected light signals the wall movement such that the value of the vacuum applied through the head 18 to achieve this initiation of movement is equal to the vacuum Within the packet 12. In a preferred embodiment a vacuum reference plate 44 is placed beneath the packet 12 to ensure that no deformation occurs on the reverse surface 16 of the packet. A packet production line model is also described.

REFERENCES:
patent: 2512134 (1950-06-01), Baule
patent: 3117441 (1964-01-01), Zimmerman
patent: 3667281 (1972-06-01), Pfeifer
patent: 3940608 (1976-02-01), Kissinger et al.
patent: 4478070 (1984-10-01), Clifford et al.
patent: 4656866 (1987-04-01), Aarts
patent: 4709578 (1987-12-01), Iwasaki et al.
patent: 4715215 (1987-12-01), Perhach et al.
patent: 4747299 (1988-05-01), Fox et al.
patent: 4771630 (1988-09-01), Croce et al.
patent: 4907443 (1990-03-01), Pailler

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