A capacitive bubble level and its application on the transit instrument

Details A capacitive bubble level and its application on the transit instrument A capacitive bubble level and its application on the transit instrument

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7..150x&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 7, Issue 2, p. 150-153.

Astronomy and Astrophysics

Astrophysics

Scientific paper

A bubble level based on a capacitive transducer is described. The transducer consists of four pieces of tin-foil stuck on the surface of the bubble level, forming two capacitors. By measuring the capacitive difference between the two, the position of the bubble level can be found. It has a measuring range of 12''/. and an accuracy of +/-0''/.1. It is compatible with visual reading and lends itself readily to digitization and automation. When used on the transit instrument the personal equation in the time determination was greatly reduced (from +/-3.9 ms to +/-1.1 ms in one test).

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