Torch height sensing apparatus

Details Torch height sensing apparatus Torch height sensing apparatus

B - Operations, Transporting

23

K

341/101

B23K 7/10 (2006.01) B23K 7/02 (1980.01)

Patent

CA 1177940

Torch Height Sensing Apparatus Abstract A torch height sensing apparatus is provided for generating information representative of the spacing between a cutting torch and an associated workpiece. The apparatus drives a preselected current from the torch through the torch flame to the workpiece so that electrons flow from the workpiece through the flame to the torch. The output current biases the flame into the linear region of the preselected voltage-current characteristic at a positive torch to workpiece current. Biasing the torch for positive current flow from the torch to the workpiece insures that flame height sensing occurs in the positive linear region where the sensitivity is greatest due to the avail- ability of thermally emitted electrons at the workpiece.

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