Instrument for measurement of vacuum in sealed thin wall packets
Patent
·
OSTI ID:869836
- Oak Ridge, TN
- Knoxville, TN
- Lexington, KY
An instrument for the measurement of vacuum within sealed packets 12, the packets 12 having a wall 14 that it can be deformed by the application of an external dynamic vacuum to an 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. A change (e.g., a decrease) of retro-reflected light signals the wall movement such that the value of the dynamic vacuum applied through the head be to achieve this initiation of movement is equal to the vacuum within the packet 12. In a preferred embodiment a vacuum plate 44 is placed beneath the packet 12 to ensure that no deformation occurs on the reverse surface 16 of the packet. A vacuum can be applied to a recess in this vacuum plate, the value of which can be used to calibrate the vacuum transducer in the detector head.
- Research Organization:
- LOCKHEED MARTIN ENRGY SYST INC
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
- Patent Number(s):
- US 5406831
- OSTI ID:
- 869836
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/73/356/
12
14
16
18
20
26
44
accomplish
achieve
application
applied
apply
beneath
bifurcated
calibrate
change
controlled
controlled manner
decrease
deformable
deformable wall
deformation
deformation occurs
deformed
detector
detector head
dynamic
dynamic vacuum
embodiment
ensure
equal
external
head
initiation
instrument
lift
light
light pipe
light signal
light signals
limited
manner
measurement
monitored
movement
occurs
packet
packets
photo
pipe
placed
placement
plate
preferred
preferred embodiment
recess
reflected light
retro-reflected
reverse
sealed
sealed packets
signals
surface
transducer
vacuum
value
via
wall
wall packets
12
14
16
18
20
26
44
accomplish
achieve
application
applied
apply
beneath
bifurcated
calibrate
change
controlled
controlled manner
decrease
deformable
deformable wall
deformation
deformation occurs
deformed
detector
detector head
dynamic
dynamic vacuum
embodiment
ensure
equal
external
head
initiation
instrument
lift
light
light pipe
light signal
light signals
limited
manner
measurement
monitored
movement
occurs
packet
packets
photo
pipe
placed
placement
plate
preferred
preferred embodiment
recess
reflected light
retro-reflected
reverse
sealed
sealed packets
signals
surface
transducer
vacuum
value
via
wall
wall packets