Pressure transducer

Measuring and testing – Gas analysis – Moisture content or vapor pressure

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Details

336 30, G01L 910

Patent

active

039466159

ABSTRACT:
A pressure transducer having a substantially linear output signal with respect to a given phenomenon of interest, which in turn is a non-linear function of a pressure differential. An interior chamber in a housing is divided into compartments by a thin, flexible, magnetically permeable diaphragm. Stationary reactance elements are positioned on opposite sides of the diaphragm at approximate gap distances therefrom (with the diaphragm unflexed) of from 0.25 mm to 4.0 mm for one element and from 0.05 mm to 0.8 mm for the other, the ratio of the gap for one element to the gap for the other element being at least 2:1. The diaphragm flexes when a pressure differential representing the phenomenon of interest is applied across it, and thereby changes the reactive coupling with each of the reactance elements. By an appropriate selection of gap distances within the above stated ranges, a steady state signal applied to the reactance elements will produce an output that varies substantially linearly with respect to variations in the phenomenon of interest.
In a particular embodiment the reactance elements each comprise inductance coils having primary and secondary windings, the primary windings being connected in a series circuit with input terminals and the secondary windings connected in a series circuit with output terminals. Appropriate gap distances for an airspeed indicator and for an altimeter are described as representative applications of the invention.

REFERENCES:
patent: 3537308 (1970-11-01), Darlington
patent: 3625116 (1971-12-01), Hluchan

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