MEASUREMENT OF THE SHRINKING FORCE OF CATHODE RAY TUBE’S SHRINK FIT RIM BAND
|Vygantas Augutis, Darius Gailius, Arturas Milinskas|
- The paper describes some Cathode Ray Tubes (CRT) Implosion Protection Systems (IPS) and their possible control methods.
The implosion of CRT (tube) is prevented by using the Shrink Fit Rim Band (SFRB) reinforcing the edge of the tube so that it cannot bulge outwards. The main parameter of SFRB is the shrinking force. Measurement of such a shrinking force is a very important SFRB quality control method herewith of safe CRT. In this paper we consider several methods of shrinking force measurement:
- Magnetization method;
- Barkhausen’s noise method;
- CRT imitator-measurer.
Magnetization method can be successfully used for the measurement of shrinking force. However, there have been found some regularities of this method, which partly limit its application in a number of cases. This method cannot be used when the shrinking force changes its direction. It is applicable only when controlled material is magnetized.
Barkhausen’s noise method is rather effective in the control of shrinking force. However as the Barkhausen’s noise depends not only upon stresses in material but also upon chemical and structural composition of material, there is a problem of calibration.
CRT imitator-measurer provides sufficient accuracy of measurement; therefore it can effectively measure the shrinking force. The device is successfully used in carrying out experiments in Ekranas Co.
- Force Measurement, Cathode Ray Tube
- Event details
- Event name:
- XVII IMEKO World Congress
Metrology in the 3rd Millennium
- Dubrovnik, CROATIA
- 22 June 2003 - 28 June 2003