Pressure transducer
First Claim
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1. A pressure transducer comprising:
- (a) a body;
(b) affixed to one end of said body a closed flexible chamber having an extensible end movable along a single axis of extension in a direction away from said body, the interior of said chamber communicating with an external pressure;
(c) a saddle connected to said extensible end, said saddle for interconnecting the extensible end of said chamber to one end of an elongated elastic member in such a way that the centerline of said elastic member lies along said single axis of extension of said flexible chamber, said elongated elastic member attached at one end to said saddle at a point lying along said single axis of extension of said chamber and at the other end to said body at a point lying along said single axis of extension of said chamber, whereby extension of said chamber increases stress within said elastic member;
(d) means positioned to both excite said elastic member into resonant vibration and to generate a frequency related output signal proportional to stress within said elastic member; and
(e) a housing to enclose said flexible chamber within a reference chamber formed thereby, said reference chamber having a reference pressure, whereby an external pressure applied to the interior of said flexible chamber causes said chamber to extend along its single axis against said reference pressure.
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Abstract
A pressure transducer 10 is disclosed wherein a bellows 11 is expanded by an external pressure applied at pressure port 16. The force created by external pressure applied to bellows 11 is mechanically transferred to one end of a vibrating elastic member 14 by axial displacement of saddle 13. A change in external pressure is thereby read as a change in resonant frequency of elastic member 14.
55 Citations
13 Claims
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1. A pressure transducer comprising:
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(a) a body; (b) affixed to one end of said body a closed flexible chamber having an extensible end movable along a single axis of extension in a direction away from said body, the interior of said chamber communicating with an external pressure; (c) a saddle connected to said extensible end, said saddle for interconnecting the extensible end of said chamber to one end of an elongated elastic member in such a way that the centerline of said elastic member lies along said single axis of extension of said flexible chamber, said elongated elastic member attached at one end to said saddle at a point lying along said single axis of extension of said chamber and at the other end to said body at a point lying along said single axis of extension of said chamber, whereby extension of said chamber increases stress within said elastic member; (d) means positioned to both excite said elastic member into resonant vibration and to generate a frequency related output signal proportional to stress within said elastic member; and (e) a housing to enclose said flexible chamber within a reference chamber formed thereby, said reference chamber having a reference pressure, whereby an external pressure applied to the interior of said flexible chamber causes said chamber to extend along its single axis against said reference pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification