Abstract: An eddy current sensor probe which includes first and second rigid end portions coupled together with a central portion comprising a flexible membrane. The flexible membrane includes indentations comprising sensor supporting regions. A differential pressure is applied across the membrane to position the sensors in a favorable location for collecting data related to the condition of the wall portion of hollow tubes.

Abstract: A defect such as a crack in a steam pipe is monitored by employing ultrasonic techniques to generate defect dependent signals and employing an Adaptive Learning Network (ALN) model to analyze the signals, whereby changes in the defect can be detected.

Abstract: Apparatus and method for measuring the crevice gap clearance between the tubes and tube supports in a heat exchanger includes setting the tube into vibration until it impacts against the tube support plate and determining by accelerometers mounted on the tube the distance the tube has moved.

Abstract: A method of detecting and monitoring leaks in the piping of a nuclear reactor senses the acoustic energy from the leak and analyzes its frequency spectrum versus acoustic amplitude. A choke flow condition will exist where the leak flows at sonic velocity; here the acoustic energy is directly proportional to the area of the crack producing the leak. This is utilized to provide an indication of crack enlargement.

Abstract: A distance measuring device especially suitable for use in a method of measuring the internal configuration of a tube is disclosed herein. This device utilizes at least one photodetecting arrangement including a plurality of individual photocells and means for mounting the photocells in a linear array. The device also includes at least one optical fiber for directing a beam of light from a source towards a point on the surface to be measured, for example, on the inner surface of a tube, and means for supporting the optical fiber and array of photocells relative to one another and to the surface to be measured such that the beam is reflected off of the point and onto a particular one of the photocells, depending upon the distance between these points and the array of photocells.