Abstract: A method for determining a fatigue status of a growing crack in a substrate. An electrochemical sensor device is provided and includes an electrode formed from a stainless steel mesh. The electrochemical device has a bottom surface that contacts the substrate. The bottom surface is coated with an adhesive layer, and a release paper is attached to the adhesive layer. The release paper is separated from the adhesive layer, thereby exposing the adhesive layer. The electrochemical sensor device is secured to the substrate by bringing the adhesive layer in contact with the substrate and thereby forming an electrolyte cavity bounded in part by the substrate. The adhesive seals the bottom surface of the device to the substrate in order to prevent leakage of electrolyte from the cavity. The cavity is filled with the electrolyte.

Abstract: A videoscope includes a sensor end having an image detector and at least one sensor selected from the group consisting of an eddy current sensor, an ultrasonic sensor, or an array of such sensors, a handle; and an elongated arm that comprises a conduit that connects the sensor end to the handle. The conduit houses a link that transmits image information from the image detector through the conduit, and the conduit further houses at least first and second working channels that extend from the sensor end to the handle. Fluid injected at a handle end of the conduit passes through the first working channel, out the sensor end, and onto the surface under examination. The second working channel contains the eddy current or ultrasonic sensor and passes their signals through the conduit.

Abstract: A videoscope includes a sensor end having an image detector and at least one sensor selected from the group consisting of an eddy current sensor and an ultrasonic sensor, a handle; and an elongated arm that comprises a conduit that connects the sensor end to the handle. The conduit houses a link that transmits image information from the image detector through the conduit, and the conduit further houses at least first and second working channels that extend from the sensor end to the handle. Fluid injected at a handle end of the conduit passes through the first working channel, out the sensor end, and onto the surface under examination. The second working channel contains the eddy current or ultrasonic sensor and passes their signals through the conduit.