title: Zebra schlieren optics for leak detection.
abstract: A modification of schlieren optics was explored as a technique for industrial gas-leak detection. A high-contrast pattern on thin reflecting material was imaged with a zoom lens onto a negative of the same pattern as a method of eliminating the ordinary rays. The geometry of the industrial setting determines the useful spatial frequency of the pattern.
authors.forename: R E
authors.initials: RE
authors.lastname: Peale
authors.forename: P L
authors.initials: PL
authors.lastname: Summers