A liquid microbarograph

Author: Akhmetov O.   Pilgaev S.   Fedorenko Yu.   Dneprovskii D.  

Publisher: MAIK Nauka/Interperiodica

ISSN: 0020-4412

Source: Instruments and Experimental Techniques, Vol.53, Iss.5, 2010-09, pp. : 750-754

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Abstract

A liquid microbarograph has been designed for continuous recording of variations in the atmospheric pressure with characteristic times ranging from 0.25 s to a few hours with a resolution of 0.02 Pa or better. The instrument is based on a sensor composed of two communicating vessels filled with transformer oil. A shift of the liquid level is recorded by the measuring circuit, the key component of which is an AD7746 capacitance-to-digital converter. The microbarograph has been used to good effect as a part of the atmospheric measuring system (Apatity, Murmansk oblast) over the last 3 years.