An opto-pneumatic level

Details An opto-pneumatic level An opto-pneumatic level

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986optco..57...89c&link_type=abstract

Optics Communications, Volume 57, Issue 2, p. 89-92.

Physics

Optics

1

Scientific paper

Topographic contours over the meniscus of a free mercury pool were obtained by the shadow moiré method. The fringe pattern consisted of concentric circles which move to off-centre position if the container deviated from horizontality. This simple phenomenon forms the basis of a sensitive level descibed here. The detection limit of such a level was found to be of the order of 10-5 rad. Nevertheless, the essential approach is similar to that of Livnat et al. where they are formed similar fringes over a float in their moiré level. The advantage of a free mercury meniscus over a float is discussed. It is found to be about one order more sensitive besides being more practical.

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