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Noncontact monitoring of liquid surface levels with a precision of 10 micrometers: A simple ultrasound device
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机译：Noncontact monitoring of liquid surface levels with a precision of 10 micrometers: A simple ultrasound device
A simple inexpensive device has been designed to measure the position of a flat surface to an accuracy of plusmn;10 mgr;m and has been applied to monitor water levels in studies of spread monolayers at the airhyphen;water interface. This instrument provides for determination of surface location in a range intermediate between those accessible by physical methods and those requiring the much more expensive and difficult techniques of interferometry. This technique utilizes a sound transmitter operating at 45 kHz and simple microphones coupled to phasehyphen;shift measurements via a phasehyphen;tohyphen;voltage converter.
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