Diffractometer

Details Diffractometer Diffractometer

1979-04-11

1981-09-01

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

350 89, G01N 2100

Patent

active

042868742

ABSTRACT:
A diffractometer comprises means for illuminating a specimen plane and a lens for converging rays diffracted from the specimen plane. In order that existing optical apparatus may readily be adapted for use as a diffractometer, the illuminating means (12a, 12b, 13, 14) is arranged to illuminate the specimen plane (0-0') at an acute angle, and a positive lens (15) having its principal axis normal to the specimen plane (0-0') is arranged to converge rays diffracted normally from the specimen plane. The apparatus is particularly susceptible to compact construction by arranging, in successive order from the specimen plane (0-0'), a field stop (17), the positive lens (15), an aperture stop (16) and a photo-detector (19), which parts advantageously can form a modular assembly. The invention is particularly applicable to converting microscopes for use as diffractometers, which then are suitable for use in monitoring respirable air-born fibers.

REFERENCES:
patent: 2812686 (1957-11-01), Sinclair
patent: 3563660 (1971-02-01), Soloway et al.
Timbrell, "Alignment of Respirable Asbestos Fibres by Magnetic Fields", Annals of Occupational Hygiene vol. 18, p. 399.

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