Open area ratiometer

Details Open area ratiometer Open area ratiometer

1980-10-14

1983-12-20

Sikes, William L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356379, G01B 902

Patent

active

044214090

ABSTRACT:
An optical apparatus and method for measuring the percent of open area of a perforated sheet. The apparatus and method based on Fourier optics uses a light detector which measures only a small central portion of the light in a Fraunhofer diffraction pattern of the perforated sheet. The ratiometer offers both accurancy and speed in the measuring of the percent of open area while avoiding diffraction problems which are characteristic with arrays of small holes in the perforated sheet. Also, the invention can be used with both opaque and translucent materials.

REFERENCES:
Chapman et al., "A Fourier Transform Method for the Verification of Wire Screens for Standard Sieves", J. Phys. E. Sci. Instrum., vol. 10, No. 6, pp. 621-626, 6/77.
Dickey et al., "Optical Open-Area Ratiometer", SPIE, vol. 220, Optics in Metrology and Quality Assurance, pp. 82-88, 1980.

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