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Self-contained pipeline inspecting system

  • US 3,243,697 A
  • Filed: 07/03/1961
  • Issued: 03/29/1966
  • Est. Priority Date: 07/03/1961
  • Status: Expired due to Term
First Claim
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1. A PROBE FOR THE INTERNAL INSPECTION OF TUBULAR MEMBERS COMPRISING:

  • AN EXCITER COIL AND A PICKUP COIL, SAID COILS BEING SPACED A DISTANCE SUFFICIENT TO CAUSE THE VOLTAGE INDUCED IN SAID PICKUP COIL AS A RESULT OF A VOLTAGE APPLIED TO SAID EXCITER COIL TO VARY EXPONENTIALLY WITH THE THICKNESS OF THE WALL OF SAID TUBULAR MEMBER;

    A BATTERYOPERATED ALTERNATING CURRENT POWER SUPPLY COUPLED TO SAID EXCITER COIL;

    A TRIGGER CIRCUIT COUPLED TO SAID PICKUP COIL AND DISPOSED TO TRIGGER AT A PREDETERMINED POINT IN THE CYCLE OF THE SIGNAL INDUCED IN SAID PICKUP COIL;

    SAID TRIGGER CIRCUIT BEING COUPLED TO A STOBOSCOPE CIRCUIT TO FLASH A NEON LIGHT WHENEVER SAID TRIGGER CIRCUIT TRIGGERS;

    A TUBULAR ELEMENT DISPOSED TO BE ROTATED BY A SYNCHRONOUS MOTOR COUPLED TO SAID POWER SUPPLY, THE EDGE OF SAID TUBULAR ELEMENT HAVING A HELICAL SHAPE, THE AXIS OF THE HELIX BEING COAXIAL WITH THE AXIS OF THE TUBULAR ELEMENT, SAID NEON LIGHT BEING DISPOSED WITHIN SAID TUBULAR ELEMENT;

    A LIGHT SENSITIVE RECORDING MEDIUM DISPOSED TO BE MOVED PAST SAID TUBULAR ELEMENT;

    A SCANNING SLOT DISPOSED BETWEEN SAID TUBULAR ELEMENT, AND SAID RECORDING MEDIUM TO MASK ALL OF SAID RECORDING MEDIUM EXCEPT THE PORTION ALIGNED WITH SAID SLOT.

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