Force controlled variable reactance transducer

• US 3,140,450 A
• Filed: 02/13/1961
• Issued: 07/07/1964
• Est. Priority Date: 02/13/1961
• Status: Expired due to Term

• Current Assignee: John R. Tavis
• Original Assignee: John R. Tavis
• Inventors: Tavis, John R.
• Application Number:
  US04/088,823
• Time in Patent Office: 1,240 Days
• US Class Current: 331/40
• CPC Class Codes: G01L 9/007 using variations in inductance
• CPC Class Codes: G01L 9/105 with temperature compensating means non electric temperature compensating means G01L19/04

Claims

1. A TRANSDUCER COMPRISING A HOUSING, A FORCE RESPONSIVE ELEMENT WHICH DEFLECTS IN ACCORDANCE WITH APPLIED FORCE MOUNTED IN SAID HOUSING AND DEFINING FIRST AND SECOND CHAMBERS, FIRST AND SECOND REFERENCE OSCILLATORS EACH HAVING A TUNED CIRCUIT THAT CONTROLS THE OSCILLATOR'"'"''"'"'S FREQUENCY, MEANS COUPLING THE TUNED CIRCUIT OF THE FIRST OSCILLATOR TO ONE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR ALTERING THE TUNING THEREOF IN ACCORDANCE WITH DEFLECTION OF SAID FORCE RESPONSIVE ELEMENT, MEANS COUPLING THE TUNED CIRCUIT OF THE SECOND OSCILLATOR TO THE OPPOSITE SIDE OF THE FORCE RESPONSIVE ELEMENT FOR OPPOSITELY ALTERING THE TUNING THEREOF IN ACCORDANCE WITH THE SAME DEFLECTION, AND MEANS COUPLED TO THE FIRST AND SECOND OSCILLATORS FOR DERIVING AN OUTPUT SIGNAL FREQUENCY REPRESENTATIVE OF THE DIFFERENCE IN OSCILLATOR FREQUENCIES.