| 摘要 |
In splicing optical fibres (3) by means of an electric arc generated between electrodes (1), during the welding the electric power is measured which is generated in the arc. This electric power is maintained constant at varying ambient conditions such as varying atmospheric pressure. A signal representing the welding voltage is tapped at the middle terminal of a voltage divider circuit (R1, R2) and a signal representing the welding current is produced over a resistor (R3). The signals are inputs to a multiplying circuit (23) and the output signal thereof is fed to one input of a comparator (29). To the other input of the comparator a reference voltage (URef.) is fed. The error voltage from the comparator (29) is an input signal to a control circuit (31) providing a control signal to circuits for generation of the voltage between the electrodes (1). |
