Railway work machine

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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104 7B, G01J 120

Patent

active

045380619

ABSTRACT:
The machine comprises a device for shifting the track which is controlled by a device for the detection of its geometrical defects.
The detection device comprises three rail feelers to which there are connected a light-ray emitter (17), a screen (18) having two parallel delimiting edges (19, 20) and a receiver (21) having two identical photovoltaic cells (22, 23) arranged in such a manner that the sum of their irradiated surfaces (u+d) is a constant and their difference (u-d) is proportional to the displacements of the screen.
The signals produced by the two cells are processed in an electronic circuit comprising a totalizer (28) delivering a signal for the control of the displacement device proportional to the said difference (u-d) and a piloting circuit (30, 41, 42) of the emitter to maintain the irradiation of the two cells constant by comparison of a signal proportional to the said sum (u=d) with a reference signal (S.sub.0).

REFERENCES:
patent: 3381626 (1968-05-01), Fagan et al.
patent: 3706284 (1972-12-01), Plasser et al.
patent: 4004852 (1977-01-01), Pentecost
patent: 4184080 (1980-01-01), Massey
patent: 4260882 (1981-04-01), Barnes
patent: 4292513 (1981-09-01), Simmons et al.
patent: 4356393 (1982-10-01), Fagfield
patent: 4371946 (1983-02-01), Constantinides et al.
Research Disclosure, No. 184, Aug. 1979, Apparatus for Tracking a Record Track on a Video Disc

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