ODM(T) 20 ... 130

Outside Diameter Measurement
 
The device has been designed to measure the outside diameter of tubes or similar articles, such as technical glass, domestic glass, laboratory glass.

Principle of Measurement

The device is based on a CCD-row camera. It takes an image of the outside edges of the tube, which is projected by means of a telecentric lens onto the sensor. The size of the camera as well as the lenses are adapted in accordance with the diameter to be measured. In consequence of the telecentric lens the image of the object to be measured is not influenced by the distance to the camera. In this way the diameter of the tube is determined in a precise and reliable way.

Structure

The system comprises the following components:

  • camera unit
  • illumination unit
  • electronic unit.
The device is part of a series. It will be adapted to the different tasks. Camera unit as well as illumination unit can be protected by means of water cooling, air cooling and radiation protection optionally. This way the measuring device can be installed in hot places immediately at the draw.

Operation

Special emphasis has been placed on the operator convenience of the apparatus: Any operation of the device is not required.
The measuring process works automatically without operation. Any adjustment is not necessary.

Specifications

  • Measuring range: 1.0 ... 60.0 mm
  • Measuring accuracy: 0.01 mm
  • Measuring distance: 260 mm
  • Measuring frequency: up to 2000 measurem. per second
  • Display and transfer of the measured values: digital display, serial interface RS 232
Advantages
  • non-contact measurement
  • measurement can be provided within flames
  • high measuring frequency and accuracy no adjustment required, no wear or drift

Two diameter measuring devices 
at a Danner tubing line.
 
 
 
 

Application at a Vello tubing line: three wall thickness and two diameter measuring devices supply the measuring values for the selecting computer.

Structure and main dimensions of ODM

d [mm] D [mm] L [mm] A [mm]
กก กก กก กก
20 100 270 65
30 120 300 65
40 100 250 65
50 160 300 85
50 400 650 85
60 160 320 105
60 310 550 105
80 500 750 135
120 800 1190 190
130 800 1190 190
Typical dimensions of ODM.
Further measuring ranges and 
dimensions on demand.
References

Technische Glaswerke Ilmenau, Germany (5 units)
Sklarny Kavalier Sazava, Czech Republic (6 units)
OSRAM, Germany (2 units)
Telux Weisswasser, Germany (2 units)
Medizinisches Glas Tuimasy, Russia (4 units)
JOB Ahrensburg, Gemany