Instrument for measurement of vacuum in sealed thin wall...

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

G - Physics

01

M

G01M 3/02 (2006.01) G01M 3/32 (2006.01) G01M 3/36 (2006.01) G01M 3/38 (2006.01)

Patent

CA 2112904

2112904 9315385 PCTABS00024 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 photodetector (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).

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