Torch height sensing apparatus

Details Torch height sensing apparatus Torch height sensing apparatus

1979-03-20

1982-05-04

Sheehan, John P.

Metal treatment

Compositions

Heat treating

266 76, 318637, 318650, B23K 700

Patent

active

043280498

ABSTRACT:
A torch height sensing apparatus (10) is provided for generating information representative of the spacing between a cutting torch (12) and an associated workpiece (14). The apparatus (10) drives a preselected current from the torch (12) through the torch flame to the workpiece (14) so that electrons flow from the workpiece (14) through the flame to the torch (12). The output current biases the flame into the linear region of the preselected voltage-current characteristic at a positive torch (12) to workpiece (14) current. Biasing the torch (12) for positive current flow from the torch (12) to the workpiece (14) insures that flame height sensing occurs in the positive linear region where the sensitivity is greatest due to the availability of thermally emitted electrons at the workpiece.

REFERENCES:
patent: 2364645 (1944-12-01), Mott et al.
patent: 2534958 (1950-12-01), Deming
patent: 2949391 (1960-08-01), Anderson
patent: 3398342 (1968-08-01), Redman
patent: 3809308 (1974-05-01), Roeder et al.
patent: 3823928 (1974-07-01), Stolin et al.
patent: 3928790 (1975-12-01), Schmall
patent: 4156125 (1979-05-01), Brown
patent: 4170727 (1979-10-01), Wilkins

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