Non-contact shape meter for flatness measurements

Details Non-contact shape meter for flatness measurements Non-contact shape meter for flatness measurements

1996-07-22

1998-07-14

Hantis, K.

Optics: measuring and testing

By polarized light examination

With light attenuation

G01B 1130

Patent

active

057813027

ABSTRACT:
A shape meter for measuring the deviation from flatness of a moving rolled steel plate is disclosed. The shape meter includes a laser source for generating an illuminated spot on the steel plate. The laser spot must be separable or distinguishable from background radiation emitted by the steel plate. For instance, if the steel plate is hot and the laser source is an argon laser generating blue green light, the optical filter must pass the blue green light and filter the red thermal emissions. The laser light is directed onto the moving steel plate, and a detector measures the light scattered from the steel plate. The detector includes an optical filter, an optical lens, and a lateral effect diode sensor. A computer then calculates and reports the deviation from flatness of the moving rolled steel plate based on the scattered light measured with the lateral effect diode sensor.

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