Optical method of determining a physical attribute of a...

Details Optical method of determining a physical attribute of a... Optical method of determining a physical attribute of a...

2005-03-21

2009-02-17

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Angle measuring or angular axial alignment

Apex of angle at observing or detecting station

Reexamination Certificate

active

07492448

ABSTRACT:
A method for optically determining a physical attribute of a moving object, such as the height h of the carbons (14) of a pantograph head (10). This method incorporates a method for optically establishing a mathematical spatial relationship between one or more cameras (26) and one or more fanned lasers (24) each capable of projecting a laser beam along a laser plane (28). The method comprises: establishing an orientation and location of each camera (26) with respect to a co-ordinate system; establishing an orientation of each laser plane (28) within the co-ordinate system; and deriving a transformation function for calculating the three dimensional position of points within the plane (28) of each respective laser beam from a pixel location within a pixelated image created by each of the cameras.

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McIvor A M., “Calibration of a laser stripe profiler,” 3-D Digital Imaging and Modeling, 1999. Proceedings Second International Conference on Ottawa, Ontario, Canada, Oct. 4-8, 1999, Los Alamitos, CA, USA, IEEE Comput. Soc. US, pp. 92-98, Oct. 4, 1999.
Izquierdo, M.A.G. et al., “Sub-pixel measurement of 3D surfaces by laser scanning,” Aug. 30, 1999, Sensors and Actuators A, Elsevier Sequoia S.A., Lausanne, Switzerland, pp. 1-8.

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