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FIGURE 3.48 Prism tip for liquid sensing.
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The power of fiber optics is further shown in the flexibility of its system configurations. A master industrial terminal (Fig. 3.49) can access any of a number of remote processors. The flexibility of switching, distance capability, and noise immunity of such a system are its primary advantages. Figure 3.50 illustrates a passive optical coupler with a two-way fiber-optic link communicating over a single fiber through an on-axis rotary joint. Such a system allows a simple uninterrupted communication link through rotary tables or other rotating machinery. This is a true challenge for high-data-rate communication in a wire system.
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Optical fibers are becoming increasingly easier to terminate as rapid advances in termination technology continue to be made. Several manufacturers have connector systems that require no polishing of the fiber end, long a major objection in fiber optics. Products that eliminate epoxy adhesives are also being developed. Field installation times now typically average less than ten minutes for large-core fibers (100 and 200 m) with losses in the 1- to 3-dB range. Further,
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Fiber Optic Cable 2000 Meters (Maximum) 2000 Meters (Maximum) Industrial Terminal Fiber Optic Line Driver Fiber Optic Terminal Expander
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Fiber Optic Line Driver
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FIGURE 3.49 Master industrial terminal and remote processors.
FIGURE 3.50
Passive optical coupler.
power budgets for well-designed industrial links normally provide a much greater latitude in making a connection. A 5- to 6-dB-loss connection, while potentially catastrophic in other types of systems, may be quite acceptable in short-haul systems with ample power budgets. The most popular connector style for industrial communications is the SMA style connector, distinguished by its nose dimensions and
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FIGURE 3.51
SMA connection to an information link.
configuration, as well as the thread size on the coupling nut. The coupling nut is employed to mechanically join the connector to a mating device on the data link or to a thread splice bushing. Figure 3.51 illustrates an SMA connection to an information link.
3.15 The Testing of Fiber Optics
Optical measurements, perhaps among the most difficult of all physical measurements, are fundamental to the progress and development of fiber-optic technology. Recently, various manufacturers have offered lines of fiber-optic test equipment for use in field and laboratory. Typical field measurement equipment determines the average optical power emitted from the system source, the component and overall system loss, the bit error rate, and the location of breaks in the fiber. Laboratory equipment measures loss through connectors and splicing, characterizes transmitters and receivers, and establishes bit error rate. The testing of fiber-optic cables or systems is normally done with a calibrated light source and companion power meter. The light source is adjusted to provide a 0-dB reading on the power meter with a short length of jumper cable. The cable assembly being tested is then coupled between the jumper and the power meter to provide a reading on the meter, in decibels, that corresponds to the actual loss in the cable assembly. Alternatively, the power through the cable from the system s transmitter can be read directly and compared with the system s receiver sensitivity specification. In the event of a cable break in a long span, a more sophisticated piece of test equipment, an optical time-domain reflectometer (OTDR), can be employed to determine the exact position of the break.
3.16 Testing Light Sources
The Photodyne 9XT optical source driver (Fig. 3.52) is a handheld unit for driving LED and laser fiber-optic light sources. The test equipment is designed to take the shock and hard wear of the typical
Fiber Optics in Sensors and Control Systems
FIGURE 3.52 Photodyne 9XT optical source driver. (Courtesy 3M Corporation)
work-crew environment. The unit is powered from two rechargeable nicad batteries or from line voltage. The LED series is suited for measurement applications where moderate dynamic range is required or where coherent light should be avoided. The laser modules are used for attenuation measurements, requiring extreme dynamic range or where narrow spectral width and coherent light are required. The laser modules are the most powerful source modules available.
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