Inside
Diameter Measurement at Tubes
The device has been designed to
measure the inside diameter of tubes immediately at the tubing line as
well as at off-line applications.
Principle of
Measurement
Images of the inside edges of the tube
are generated by means of a special illumination. These images are
projected to a row camera. The inside diameter is measured by
evaluation of the edges distance by means of a microcontroller.
Structure of
the System
The device comprises
- the illumination unit,
- the ccd-camera unit,
- the electronic unit.
Service and
Operation
Particular emphasis has been placed on
operator convinience:
- an adjustment is not required even
after job changes,
- a telecentric lense ensures that
changes in the position of the tube do not have any impact on the
result of measurement,
- a rugged row camera is in
accordance with the needs of in-line installation some displays
make service easy to handle.
Specifications
- Outside diameter: up to 70 mm
- Relation outside/inside diameter:
up to 4
- Relative accuracy of measurement:
0.01 mm (according to DIN 1319)
Advantages
- The inside diameter is determined
immediately.
- The measurement can be done at the
hot tubing line.
- The device can be placed close to
the forming area of the tubing line. This way a short delay time
between forming and measuring level is reached. The basis for an
automatic regulation is provided.
- The device is the basis for
calibration of volume measuring devices without mercury.