English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This paper shows some practical intcrferometers for testing very large and very small specimens. This is accomplished by using a particular type of beam divider that operates near the vertex of a convergent or divergent beam of light that permits a lmost un limi ted size fields of view. Thus very large or ver.v s mall specimens ean be tested. Also, the wave front reversing propert ies of this beam divider permit tests to be made without the necessity of using standards of reference, thus eliminating the requirement for large standards that a re usually expens ive and require large working a reas . The principl es of these interferometers are so closely related to previously described instruments t hat very li tt le addit ion al explanation is required for an understanding of their operation. Several variations of the I\:oste rs pris m type of interferom eter a re s hown schcmaticall y J

Large aperture interferometers with small beam dividers