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Fiber to the LDV instrument
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FIGURE 7.44 Special probe for measurement of blood velocity.
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Interestingly, the LDV system proved useful in the measurement of arterial blood velocity (Fig. 7.44), thereby providing valuable medical information. Another application in medical research is the study of motion of the tympanic membrane in the ear.
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Ultrasonic/laser optical inspection is a relatively new noncontact technique. A laser system for generating ultrasound pulses without distortion of the object surface is shown in Fig. 7.45. A laser pulse incident on a surface will be partly absorbed by the material and will thus generate a sudden rise in temperature in the surface layer of the material. This thermal shock causes expansion of a small volume at the surface, which generates thermoelastic strains. Bulk optical systems have been used previously to generate the laser pulse energy. However, the omnidirectionality of bulk sources is completely different from other well-known sources, and is regarded as a serious handicap to laser generation. To control the beamwidth and beam direction of the optically generated ultrasonic waves, a fiber phased array has been developed.
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FIGURE 7.45 Setup for beam steering of a laser-generated ultrasound by ber-optic phased array.
In this way, the generated ultrasonic beam can be focused and directed to a particular inspection point below the surface of an object (Fig. 7.45). This system has been optimized for the detection of fatigue cracks at rivet holes in aircraft structures. The combination of laser-generated ultrasound and an optical-fiber interferometer for the detection of the resultant surface displacement has led to a technique that is useful for a wide variety of inspection tasks in manufacturing, including high-temperature objects and areas that are difficult to access, as well as more routine inspection and quality control in various industrial environments. Such a system can be applied to the measurement of thickness, velocity, flaws, defects, and grain size in a production process.
Process Control Sensors for Acceleration
The principle of operation of the process control acceleration sensor is illustrated in Fig. 7.46. The sensor element, consisting of a small cantilever and a photoluminescent material, is attached to the end of a single multimode fiber. The input light of wavelength s is transmitted along the fiber from a near-infrared LED source to the sensor element. The sensor element returns light at two different wavelengths, one of which serves as a signal light and the other as a reference light, into the same fiber. The signal light at wavelength s is generated by reflection from a small cantilever. Since the relative angle of the reflected light is changed by the acceleration, the returned light is intensity-modulated. The reference light of wavelength r is generated
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FIGURE 7.46 Cantilever-type acceleration sensor.
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by photoluminescence of a neodymium-doped glass element placed close to the sensor end of the fiber. The optoelectronic detector module has two optical filters to separate the signals s and r and two photodiodes to convert the signal and the reference light into separate analog voltages. The signal processing for compensation is then merely a matter of electrical division. A measuring range of 0.1 to 700 m/s2 and a resolution of 0.1 m/s2 is obtained over the frequency range of 5 to 800 Hz.
7.29 An Endoscope as Image Transmission Sensor
An imaging cable consists of numerous optical fibers, typically 3000 to 100,000, each of which has a diameter of 10 m and constitutes a picture element (pixel). The principle of image transmission through the fibers is shown in Fig. 7.47. The optical fibers are aligned regularly and identically at both ends of the fibers. When an image is projected on one end of the image fiber, it is split into multiple picture elements. The image is then transmitted as a group of light dots with different intensities and colors, and the original picture is reduced at the far end. The image fibers developed for industrial use are made of silica glass with low transmission loss over a wide wavelength band from visible to near infrared, and can therefore transmit images over distances in excess of 100 m without significant color changes. The basic structure of the practical optical-fiber image sensing system (endoscope) is illustrated in Fig. 7.48. It consists of the image fiber, an objective lens to project the image on one end, an eyepiece to magnify the received image on the other end, a fiber protection tube, and additional fibers for illumination of the object.
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