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FIGURE 7.8
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Schematic diagram of an optical- ber pyrometer.
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Optical-fiber pyrometers are one of the most successful opticalfiber sensors in the field of process control in manufacturing. Typical applications are: Casting and rolling lines in steel and other metal plants Electric welding and annealing Furnaces in chemical and metal plants Fusion, epitaxial growth, and sputtering processes in the semiconductor industry Food processing, paper manufacturing, and plastic processing Figure 7.9 is a block diagram of the typical application of opticalfiber pyrometers for casting lines in a steel plant, where the temperature distribution of the steel slab is measured. The sensing element consists of a linear array of fused-silica optical rods, thermally protected by air-purge cooling. Light radiated from the heated slabs is collected by the optical rods and coupled into a 15-m-long bundle of fibers, which transmits light to the optical processing unit. In this system, each fiber in the bundle carries the signal from a separate lens, which provides the temperature information at the designated spot of the slabs. An optical scanner in the processing unit scans the bundle, and the selected light signal is analyzed in two wavelength bands by using two optical interference filters.
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Optical scanner Stepping motor Half motor IF 1 Si-PD 2
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Purge oir Probe
Optical scanner controller
Purge oir Slab Probe
Optical rod IF 2
Lens
AGC CPU Digital voltmeter Amplifier
Si-PD 1
FIGURE 7.9 Temperature distribution measurement of steel slabs by an optical- ber pyrometer using the two-wavelength method.
Industrial Sensors and Control
Pressure Sensors
If a pressure P acting on a diaphragm compresses a spring until an equilibrium is produced, the pressure can be represented as: F(kg) = A(m 2 ) P(kg/m 2 ) (7.4)
In this equation, F represents the force of the spring and A represents a surface area of the diaphragm. The movement of the spring is transferred via a system of levers to a pointer whose deflection is a direct indication of the pressure (Fig. 7.10). If the measured value of the pressure must be transmitted across a long distance, the mechanical movement of the pointer can be connected to a variable electrical resistance (potentiometer). A change in the resistance results in a change in the measured voltage, which can then easily be evaluated by an electronic circuit or further processed. This example illustrates the fact that a physical quantity is often subject to many transformations before it is finally evaluated.
Piezoelectric Crystals
Piezoelectric crystals may be utilized to measure pressure. Electrical charges are produced on the opposite surfaces of some crystals when they are mechanically loaded by deflection, pressure, or tension. The electrical charge produced in the process is proportional to the effective force. This change in the charge is very small. Therefore, electrical amplifiers are used to make it possible to process the signals (Fig. 7.11). Pressure in this situation is measured by transforming it into a force. If the force produced by pressure on a diaphragm acts on a piezoelectric crystal, a signal which is proportional to the pressure measured can be produced by using suitable amplifiers.
+ Electrical voltage Potentiometer Measured voltage ^ + = pressure
Diaphragm
Pressure p
FIGURE 7.10
De ection as a direct indication of pressure.
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Piezoelectric crystal
Pressure Diaphragm
Connection
FIGURE 7.11
Electrical ampli ers are connected to a piezoelectric crystal.
FIGURE 7.12
Strain gauge for measurement of pressure.
Strain Gauges
Strain gauges can also measure pressure. The electrical resistance of a wire-type conductor is dependent, to a certain extent, on its crosssectional area. The smaller the cross section (i.e., the thinner the wire), the greater the resistance of the wire. A strain gauge is a wire that conducts electricity and stretches as a result of the mechanical influence (tension, pressure, or torsion) and thus changes its resistance in a manner that is detectable. The wire is attached to a carrier, which in turn is attached to the object to be measured. Conversely, for linear compression, which enlarges the cross-sectional area of a strain gauge, resistance is reduced. If a strain gauge is attached to a diaphragm (Fig. 7.12), it will follow the movement of the diaphragm. It is either pulled or compressed, depending on the flexure of the diaphragm.
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