Method for identifying timber surface properties

Details Method for identifying timber surface properties Method for identifying timber surface properties

1987-01-20

1988-08-16

Willis, Davis L.

Optics: measuring and testing

By polarized light examination

Of surface reflection

356237, G01N 2121, G01N 2127

Patent

active

047640170

ABSTRACT:
A method for identifying timber surface properties using linearly polarized electromagnetic radiation containing various different wavelength components. Of the scattered radiation are measured by wavelength ranges the intensity components I.sub.min and I.sub.max that are mutually perpendicular as regards their polarization plane, wherein the polarization plane of the component I.sub.max is the same as that of the radiation directed to the surface. The identification of the surface types is made on the basis of the information about the color tone of the surface and the fiber structure achieved from the variables I.sub.min and P=(I.sub.max -I.sub.min)/(I.sub.max +I.sub.min).

REFERENCES:
patent: 3694658 (1972-09-01), Watson et al.
patent: 3976384 (1976-08-01), Matthews et al.
patent: 4482250 (1984-11-01), Hirvonen et al.
patent: 4525850 (1986-03-01), Wang et al.

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