An improved technique of measuring the focal length of a lens

Chang Chon-Wen Chang*, Su Der-Chin Su

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

53 Scopus citations

Abstract

Based on a Talbot interferometry, an improved technique for measuring the focal length of a lens is proposed. First, the test lens is positioned at the Talbot image of a grating, then a different grating is arranged at the Talbot image of the first grating through the test lens. This arrangement not only expands the measurable range, also improves the precision of the measurement. This technique is suitable for measuring both long and short focal length of a lens which can be concave and convex.

Original languageEnglish
Pages (from-to)257-262
Number of pages6
JournalOptics Communications
Volume73
Issue number4
DOIs
StatePublished - 15 10 1989
Externally publishedYes

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