Phase measuring of noise-contaminated signal

• US 3,249,868 A
• Filed: 03/07/1963
• Issued: 05/03/1966
• Est. Priority Date: 03/07/1963
• Status: Expired due to Term

• Current Assignee: Eugene H. Sheftelman
• Original Assignee: Eugene H. Sheftelman
• Inventors: Sheftelman, Eugene H.
• Application Number:
  US04/263,661
• Time in Patent Office: 1,153 Days
• US Class Current: 324/76.83
• CPC Class Codes: G01R 25/00 Arrangements for measuring phase angle between a voltage and a current or between voltages or currents

Claims

1. APPARATUS FOR THE MEASUREMENT OF PHASE OF AN INPUT SIGNAL COMPRISING A SOURCE OF A FIRST REFERENCE VOLTAGE, A SOURCE OF A SECOND REFERENCE VOLTAGE, SAID FIRST AND SECOND REFERENCE VOLTAGES BEING SIMILAR BUT IN QUADRATURE TO EACH OTHER, A FIRST PHASE DETECTOR, MEANS FOR APPLYING SAID INPUT SIGNAL AND SAID FIRST REFERENCE VOLTAGE TO SAID FIRST PHASE DETECTOR, A SECOND PHASE DETECTOR, MEANS FOR APPLYING SAID INPUT SIGNAL AND SAID SECOND REFERENCE VOLTAGE TO SAID SECOND PHASE DETECTOR, MEANS FOR AVERAGING THE OUTPUTS OF SAID FIRST AND SECOND PHASE DETECTORS AND MEANS FOR MEASURING THE RATIO OF THE AVERAGE OUTPUTS OF SAID FIRST AND SECOND PHASE DETETORS, SAID RATIO BEING PROPORTIONAL TO THE TANGENT OF THE PHASE ANGLE OF THE INPUT SIGNAL WITH RESPECT TO ONE OF SAID REFERENCE VOLTAGES.