Device for the precise transverse positioning for a member displ

Details Device for the precise transverse positioning for a member displ Device for the precise transverse positioning for a member displ

1989-10-12

1991-06-04

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

050203711

ABSTRACT:
The invention relates to a method for positioning with precision a member displaced along a rail transversely with respect to the symmetry axis of the head of the rail. According to this method, one emits through the head of the rail two ultrasound beams which are practically perpendicular to the fish plates of this rail. One receives the echoes of these beams reflected by the fish plates. One forms a regulation or adjusting signal which is a function of the time difference between the emission and the reception of its echo for each of the two ultrasound beams and uses this regulating signal to elaborate a control signal for the transverse positioning of the member.

REFERENCES:
patent: 4044594 (1977-08-01), Owens et al.
patent: 4235112 (1980-11-01), Kaiser
patent: 4662224 (1987-05-01), Turbe
patent: 4700574 (1987-10-01), Turbe

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