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Schematically shown in the drawing is a pneumatic system for accurately measuring height variations on a test object 1 without contacting the object or objects, for example, wires, thereon.
English (United States)
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Pneumatic Surface Sensing System
Schematically shown in the drawing is a pneumatic system for accurately
measuring height variations on a test object 1 without contacting the object or
objects, for example, wires, thereon.
The air flows into a filter/regulator 2. A flow meter 3 may be included to
indicate the rate of flow. A block 4 has mounted therein a nozzle 5 which directs
air towards object 1. Air flows into the block connected through passage 6 and
into a longitudinal passage 7. Nozzle 5 is connected through a passage 8 so as
to communicate with passage 7. A bleeder valve 9 is connected at the other end
of passage 7, and allows balancing the system. Additional passages 11 and 12
are connected from passage 7 to lines which are connected to signal
conditioning accumulators 14 and 16, whose outputs are connected to a
differential pressure transducer 18. The output of transducer 18 is an analog
signal which is fed to a converter 20 to produce a digital output that is fed to a
display or indicator 22.
As air flows from nozzle 5, a back pressure is created in passages 11 and 12
to actuate transducer 18 which produces a signal proportional to the difference in
pressure. This pressure differential is due to the proximity of test object 1 and is
proportional to the distance from the nozzle to the adjacent surface of the test
object at a given flow rate.
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