Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1984-05-23
1985-08-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
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
Casella Anthony J.
Gatto J.
Hespos Gerald E.
Nelms David C.
Sig Societe Industrielle Suisse
LandOfFree
Railway work machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Railway work machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Railway work machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2003347