TRANSDUCER FOR DETECTING PRESSURE CHANGES IN FLUID FLOW

• US 3,603,152 A
• Filed: 02/05/1970
• Issued: 09/07/1971
• Est. Priority Date: 02/05/1970
• Status: Expired due to Term

• Current Assignee: Thomas H. Carey, Vernon F. Alibert
• Original Assignee: Thomas H. Carey, Vernon F. Alibert
• Inventors: Alibert, Vernon F., Carey, Thomas H.
• Primary Examiner(s): Woodiel, Donald O.
• Application Number:
  US05/008,821
• Time in Patent Office: 579 Days
• Field of Search: 73/398AR,398R,406
• US Class Current: 73/723
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence

Abstract

The present device provides a housing to hold a strain responsive element such as a piezoelectric waferlike crystal. The housing can be fabricated to various sizes depending upon the fluid conduit with which it is to be used. The housing is formed to provide a very firm contact with the fluid conduit and hence any applied force or strain which the conduit experiences serves to stress the piezoelectric crystal. Accordingly, the piezoelectric crystal is very sensitive to any changes of pressure of the fluid within said conduit.

Claims

2. A transducer for generating electrical signals in accordance with claim 1 wherein said strain responsive means is a piezoelectric crystal and wherein said upper section is further formed with a chamber therein and wherein there is further formed a third aperture connecting said chamber with the outer surface of said upper section whereby when said third aperture is left open any change in pressure detected by said piezoelectric crystal is measured against the atmospheric pressure and wherein said chamber can be evacuated and said third aperture sealed to provide differences of pressure representing absolute differences of pressure and wherein said chamber can be filled with a gas under pressure and said third aperture sealed to provide a difference of pressure measured against said pressurized gas.

3. A transducer for generating electrical signals in accordance with claim 1 wherein said strain responsive means is a piezoelectric, waferlike crystal and wherein there is further included electrical means connected to the opposite surfaces of said surfaces of said crystal and adapted to be connected to a utility device.

4. A transducer for generating electrical signals in accordance with claim 1 wherein said strain responsive means is a piezoelectric crystal which is bonded to saId upper section in close proximity to said first and second contact areas by an electrically conducting epoxy resin whereby said electrically conducting epoxy resin serves as a connecting surface for one side of piezoelectric crystal.

5. A transducer for generating electrical signals in accordance with claim 1 wherein said upper section is threaded at the portion thereof which engages said adjustment section and said adjustment section is threaded at the portion thereof which engages said upper section.

6. A transducer for generating electrical signals in accordance with claim 1 wherein there is a separation between said first and second contact areas and wherein said support slug has a contact area which is approximately the width of the separation between said first and second contact areas and is disposed opposite said first contact areas to be moved in a different direction therebetween.

7. A transducer for generating electrical signals in accordance with claim 1 wherein said upper section is composed of rigid electrically conducting material.