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Medical
Technology: Nozzle Gauging
In
this application, correct assembly of a sight-feed nozzle has to be checked. The
image displays a correctly assembled nozzle with the relevant measuring lines.
Such a
nozzle is used for medical infusions. The sieve inside the nozzle acts as a
protective guard against coagulations or other particles that must not enter the
patient's blood circulation. It is therefore extremely important that this sieve
is mounted correctly.
Several
measurements are used to verify this:
-
Distance of the sieve bottom from the top of the nozzle (about 35mm) must
not differ by more than 4mm.
-
Width of the sieve must not be below a certain value.
-
Distance of the sieve from the wall must not differ by more than 1mm on both
sides.
The
nozzle is captured with two cameras, one horizontal, the other vertical, in
order to measure deviations in any direction.
The
complete inspection takes about 0.75 seconds on a Pentium 100, including a
position adjustment, which uses a reference edge to compensate for varying
positions of the object with respect to the camera.
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