Sensor and transducer apparatus

• US 4,987,783 A
• Filed: 02/02/1988
• Issued: 01/29/1991
• Est. Priority Date: 02/28/1986
• Status: Expired due to Fees

• Current Assignee: Nicholas F D'Antonio
• Original Assignee: Nicholas F D'Antonio
• Inventors: D'Antonio, Nicholas F., D'Antonio, Nicholas J.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/151,483
• Time in Patent Office: 1,092 Days
• Field of Search: 336/30, 336/75, 336/136, 331/181, 340/870.31, 73/862.64
• US Class Current: 73/432.1
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 2201/5058 Sensors or detectors
• CPC Class Codes: A61H 2201/5071 Pressure sensors
• CPC Class Codes: A61H 31/00 Artificial respiration or heart stimulation, e.g. heart massage artificial respiration by treatment with gas or air, e.g. mouth-to-mouth respiration A61M16/00; applying electric currents by contact electrodes for stimulation, e.g. heart pace-makers A61N1/36 ; teaching or training models, demonstration models for medical purposes G09B23/288
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: G01D 5/243 influencing the phase or frequency of ac
• CPC Class Codes: G01F 1/28 by drag-force, e.g. vane type or impact flowmeter
• CPC Class Codes: G01F 1/383 with electrical or electro-mechanical indication
• CPC Class Codes: G01K 5/46 with electric conversion means for final indication
• CPC Class Codes: G01L 15/00 Devices or apparatus for measuring two or more fluid pressure values simultaneously
• CPC Class Codes: G01L 19/0007 Fluidic connecting means
• CPC Class Codes: G01L 9/0058 of pressure sensitive conductive solid or liquid material, e.g. carbon granules
• CPC Class Codes: G01L 9/007 using variations in inductance
• CPC Class Codes: G01L 9/0072 using variations in capacitance
• CPC Class Codes: G01L 9/04 of resistance-strain gauges
• CPC Class Codes: G01L 9/10 by making use of variations in inductance , i.e. electric circuits therefor
• CPC Class Codes: G01L 9/12 by making use of variations in capacitance , i.e. electric circuits therefor
• CPC Class Codes: G01P 15/038 by using fluidic means
• CPC Class Codes: G01P 15/0891 with indication of predetermined acceleration values G01P15/135 takes precedence
• CPC Class Codes: G01P 15/11 by inductive pick-up

Abstract

A sensing system including a sensing device with cooperating electrical components which move relative to each other in response to a sensed environmental parameter to yield a reactance signal, which is transmitted to a remotely located processor having an oscillator for receiving the transmitted signal and generating a transduced signal whose value corresponds to the value of the environmental parameter.

Claims

1. A sensing device for generating an electric reactance signal in response to an environmental parameter for transmission to an oscillator at a remote location, said device comprising:

reactance means having a first portion and a second portion movable relative to the first portion for generating said electric reactance signal, said first portion of said reactance means comprises a first reactance member and positioning structure having at least one first locating surface fixed relative to said first reactance member,

first supporting means for supporting said first portion of said reactance means, said first supporting means comprises at least one second locating surface for engaging said first locating surface of said positioning structure to accurately locate said first reactance member relative to said first supporting means, and at least one third locating surface;

said second portion of said reactance means comprises at least one fourth locating surface for engaging said third locating surface of said first supporting means, and at least one fifth locating surface; and

second supporting means for supporting said second portion of said reactance means, wherein said second supporting means includes at least one sixth locating surface for engaging said fifth locating surface of said second portion to accurately locate said second portion in said second supporting means;

the engagement of said fourth locating surface and said third locating surface accurately locating said first and second portions of said reactance means relative to each other,

wherein said first portion of said reactance mans comprises an inductor coil and said second portion of said reactance means comprises an inductor shield.

2. A device according to claim 1 wherein said first portion further comprises a ferromagnetic core around which said inductor coil is wound.