Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1986-01-30
1989-04-18
Rosenberger, Richard A.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
G01B 1106
Patent
active
048221716
ABSTRACT:
A method and apparatus for measuring the wall thickness of transparent objects, such as glass tubes, is presented wherein a narrow band (beam) of light is projected onto a surface of the object at an angle other than 90.degree.; and the beams reflected by the adjacent boundary surface of the object and that boundary surface thereof which is spaced behind that adjacent boundary surface by the distance to be measured are focused onto the image plane of a receiver. A movable deflecting element is provided in the optical path between the light source and the image plane of the receiver. The lines of intersection between the band of light and the boundary surfaces of the layer to be measured (the lines of intersection being represented by bands of light on the image plane of the receiver), are then moved or urged by the deflecting element in the direction in which they are spaced apart. Signals are generated by the receiver in response to the appearance of first and second bands of light at a predetermined location on the image plane of the receiver. Next, the interval of time between the signals is measured to determine the wall thickness of the transparent object. An important feature of the present invention is that two measuring surfaces are provided in the image plane of the receiver which adjoin along a boundary line, the boundary line being at right angles to the direction of movement of the two bands of light.
REFERENCES:
patent: 1756785 (1930-04-01), Gallasch
patent: 2998745 (1961-09-01), McClellan
patent: 3137756 (1964-06-01), Gunther et al.
patent: 3307446 (1967-03-01), Rottmann
patent: 3807870 (1974-04-01), Kalman
patent: 4447717 (1984-05-01), Nohda
Brand Bernhard
Richter Bruno
Dipl.-Ing.Bruno Richter GmbH & Co.
Rosenberger Richard A.
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