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7.24 The Geiger Mode
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In the Geiger mode, an APD is biased above its breakdown voltage (VR > VBR) for operation at very high gain (typically 105 to 106). When biased above breakdown, an APD will normally conduct a large current. However, if this current is limited to less than the APD s latching current, there is a strong statistical probability that the current will fluctuate to zero in the multiplication region, and the APD will then remain in the off state until an avalanche pulse is triggered by either a bulk or photogenerated carrier. If the number of bulk carrier generated pulses is low, the APD can therefore be used to count individual current pulses from incident photons. The value of the bulk dark current is therefore a significant parameter in selecting an APD for photon-counting, and can be reduced exponentially by cooling.
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Accurate and precise detection of crack propagation in aircraft components is of vital interest for commercial and military aviation and the space industry. A system has been recently developed to detect cracks and crack propagation in aircraft components. This system uses optical fibers of small diameter (20 to 100 m), which can be etched to increase their sensitivity. The fibers are placed on perforated adhesive foil to facilitate attachment to the desired component for testing. The fiber is in direct contact with the component (Fig. 7.42). The foil is removed after curing of the adhesive. Alternatively, in glass-fiber-reinforced plastic (GFRP) or carbon-fiber-reinforced plastic (CFRP), materials that are used more and more in aircraft design, the fiber can be easily inserted in the laminate without disturbing the normal fabrication process. For these applications, bare single fiber or
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FIGURE 7.42 An illustration of ber to be in direct contact with the component.
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prefabricated tape with integrated bundles of fibers is used. The system was initially developed for fatigue testing of aircraft components such as frames, stringers, and rivets. In monitoring mode, the system is configured to automatically interrupt the fatigue test. The system has also been applied to the inspection of the steel rotor blades of a 2-MW wind turbine. A surveillance system has been developed for the centralized inspection of all critical components of the Airbus commercial jetliner during its lifetime. This fiber nervous system is designed for in-flight monitoring and currently is accessible to flight and maintenance personnel. An optical-fiber mesh has been tested for a damage assessment system for a GFRP submarine sonar dome. Two sets of orthogonally oriented fibers are nested in the laminate during the fabrication process. When the fibers of the mesh are properly connected to LEDs and the detectors, the system can be configured to visualize the location of a damaged area. As an alternative, a video camera and image processing are applied to determine the position of the damaged area. The fiber end faces at the detection side of the mesh are bundled and imaged into the camera tube. Two images are subtracted: the initial image before the occurrence of damage and the subsequent image. If fibers are broken, their location is highlighted as a result of this image subtraction.
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Control of the Input/Output Speed of Continuous Web Fabrication Using Laser Doppler Velocity Sensor
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A laser Doppler velocimeter (LDV) can be configured to measure any desired component velocity, perpendicular or parallel to the direction of the optical axis. An LDV system has been constructed with a semiconductor laser and optical fibers and couplers to conduct the optical power. Frequency modulation of the semiconductor laser (or, alternatively, an external fiber-optic frequency modulator) is used to introduce an offset frequency. Some commercial laser Doppler velocimeters are available with optical-fiber leads and small sensing heads. However, these commercial systems still use bulk optical components such as acoustooptic modulators or rotating gratings to introduce the offset frequency. With an LDV system, the velocity can be measured with high precision in a short period of time. This means that the method can be applied for real-time measurements to monitor and control the velocity of objects as well as measure their vibration. Because the laser light can be focused to a very small spot, the velocity of very small objects can be measured, or if scanning techniques are applied, high spatial resolution can be achieved. This method is used for various applications in manufacturing, medicine, and research. The demands on system performance with respect to sensitivity, measuring range, and temporal resolution are different for each of these applications. In manufacturing processes, for example, LDV systems are used to control continuous roll milling of metal (Fig. 7.43), control the rolling speed of paper and films, and monitor fluid velocity and turbulence in mixing processes. Another industrial application is vibration analysis. With a noncontact vibrometer, vibration of machines, machine tools, and other structures can be analyzed without disturbing the vibrational behavior of the structure.
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FIGURE 7.43 A ber-optic laser Doppler velocimeter at a rolling mill controls pressure by measuring input speeds.
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