TM (T)

Thickness Measurement at Tubes
 
The device has been designed for the non-contact wall thickness measurement of tubes. It can be used for on-line measurement at the tubing line as well as for the off-line measurement at tubes.

Measuring Principle

A laser light line is sent out onto the surface of the tube. The reflexes of the laser light, which are generated at the front side and the rear side of the surface are projected onto a CCD-line sensor. The distance between these two reflexes is evaluated.

Two laser measuring systems, which are used simultaneous, meet the surface from opposite directions. This way errors due to non parallel surfaces or wrong angle between sensor and tube axis are cancelled.

A high developed optical imaging system makes the sensor robust against distance alterations.

The sensor is calibrated for the entire measuring range. Regular calibration by the user is not necessary because of a black box model which is implemented in the evaluation computer.

Structure and Installation

The device comprises the gauge head and the electronic unit as well as the equipment for the positioning of the gauge head.

If installed under hot conditions, appropriate cooling and heat protecting devices are included.

The device is part of the modular system TV (tube visualization) and TC (tube control). In accordance with the customers requirements it will be linked together with further equipment, for example trend display, selection, statistics, visualization and regulation.

Specifications

  • Measuring range (standard):
    • 0.1 ... 3.0 mm
    • 0.5 ... 5.0 mm
    • 1.0 ... 10.0 mm
  • Accuracy: > 0.01 mm
  • Diameter of the tubes: > 1.8 mm
  • Inside/outside diameter: > 0.5 
  • Internal frequency: 2,000 measured values/second
  • Output: digital display, serial interface RS 232
Advantages
  • The wall thickness will be measured continuously and can be kept within small tolerances.
  • Non contact measurement.
  • Measurement at hot tubes and within the flame is provided.
  • No drift and wear.
  • The device shows a robust design, it is not influenced by changes of the tubes position.

Laser thickness sensor of TM(T) with protecting enclosure
 
 
 

Four thickness sensors at a vertical tubing line.
 
 
 

Thickness sensor at a quartz glass tubing line.


 
References
Sklarny Kavalier Sazava, Czech Republic (13 units)
Shandong Sunny Industry Group Jinan, P.R. China (4 units)
OSRAM, Germany(2 units)
Medizinisches Glas Tuimasy, Russia (2 units)
QSIL Ilmenau, Germany (2 units)
Technische Glaswerke Ilmenau, Germany 
Telux Weisswasser, Germany
Burgauer Quarzschmelze Jena, Germany
Heraeus Quarzglas Hanau, Germany (2 units)
Heraeus Amersil, U.S.A. 
JOB Ahrensburg, Germany
GE Quartz Europe, Geesthacht, Germany (6 units)
GE Quartz Newark, U.S.A. (2 units)
KIMMON Quartz, Japan (3 units)