The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 1981
Filed:
Apr. 11, 1979
Francis H Smith, York, GB;
Richard W Gale, Malton, GB;
Vickers Limited, London, GB;
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.