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FIGURE 30-25 The physical makeup of an optical fiber, consisting of core and cladding.
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FIGURE 30-26 Light travels through optical fibers due to a process called total internal reflection (TIR).
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be great, fiber optics perform best when the light source (and detector) are aligned to the optical axis. Types of Optical Fibers The classic optical fiber is made of glass, otherwise known as silica (which is plain ol sand). Glass fibers tend to be expensive and are more brittle than stranded copper wire, but they are excellent conductors of light, especially light in the infrared region between 850 and 1300 nanometers (nm). Less expensive optical fibers are made of plastic. Though light loss through plastic fibers is greater than through glass fibers, they are more durable. Plastic fibers are best used in communications experiments with near-infrared light sources the 780 to 950 nm range. This nicely corresponds to the output wavelength and sensitivity of common infrared emitters and detectors. Optical fiber bundles may be coherent or incoherent. These terms relate to the arrangement of the individual strands in the bundle. If the strands are arranged so that the fibers can transmit an image from one end to the other, they are said to be coherent. The vast majority of optical fibers are incoherent: an image or particular pattern of light is lost when it reaches the other end of the fiber. The cladding used in optical fibers may be one of two types: step-index and gradedindex. Step-index fibers provide a discrete boundary between more dense and less dense regions of core and cladding. They are the easiest to manufacture, but their design causes a loss of ray coherency when laser light passes through the fiber: that is, coherent light in, largely incoherent light out. The loss of coherency, which is due to light rays traveling slightly different paths through the fiber, reduces the efficiency of the laser beam. Still, it offers some very practical benefits. There is no discrete refractive boundary in graded-index fibers. The core and cladding media slowly blend, like an exotic tropical drink. The grading acts to refract light evenly, at
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any angle of incidence. This preserves coherency and improves the efficiency of the fiber. As you might have guessed, graded-index optical fibers are the most expensive of the bunch. Working with Fiber Optics Optical fibers may be cut with wire cutters, nippers, or even a knife. But you must exercise care to avoid injuring yourself from shards of glass that may fly out when the fiber is cut (plastic fibers don t shatter when cut). Wear heavy cotton gloves and eye protection when working with optical fibers. Avoid working with fibers around food-serving or -preparation areas (that means stay out of the kitchen!). The bits of glass may inadvertently settle on food, plates, or eating utensils and could cause bodily harm. One good way to cut glass fiber is to gently nick it with a sharp knife or razor, then snap it in two. Position the thumb and index finger of both hands as close to the nick as possible, then break the fiber with a swift downward motion (snapping upward increases the chance that glass shards will fly off in your direction). Building the Laser-Optic Whisker Consider the arrangement in Fig. 30-27. A laser is pointed at one end of a stepped-index optical fiber. The fiber forms one or more loops around the front, side, or back of the robot. At the opposite end of the fiber is an ordinary phototransistor or photodiode. When the laser is turned on, the photodetector registers a certain voltage level from the laser light, say 2.5 V. This is the quiescent level. When one or more of the loops of the fiber are deformed the robot has touched a person or thing, for instance the laser light passing through the fiber is diverted in its path, and this changes the interference patterns at the photodetector end. The change in light level received by the photodetector does not span a very wide range, perhaps 1 V total. But this 1 V is enough to not only determine when the robot has touched an object but the relative intensity of the collision. The more the robot has connected to some object, the more the fibers will deform and the greater the output change of the light as it reaches the photodetector.
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