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The feedback mechanism keeps the light inside the laser cavity. In order to produce an output beam, a portion of the light in the cavity must be allowed to escape. However, this escape must be controlled. This is most commonly accomplished by using a partially reflective mirror in the feedback mechanism. The amount of reflectance varies with the type of laser. A high-power laser may reflect as little as 35 percent, with the remaining 65 percent being transmitted through the
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FIGURE 2.111 Mirror combinations for a feedback mechanism.
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mirror to become the output laser beam. A low-power laser may require an output mirror reflectivity as high as 98 percent, leaving only 2 percent to be transmitted. The output mirror that is designed to transmit a given percentage of the laser light in the cavity between the feedback mirrors is called the output coupler.
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Semiconductor Displacement Laser Sensors
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Semiconductor displacement laser sensors, consisting of a light-metering element and a position-sensitive detector (PSD), detect targets by using triangulation. A light-emitting diode or semiconductor laser is used as the light source. A semiconductor laser beam is focused on the target by the lens. The target reflects the beam, which is then focused on the PSD, forming a beam spot. The beam spot moves on the PSD as the target moves. The displacement of the workpiece can then be determined by detecting the movement of the beam spot.
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2.12.3.1 Industrial Applications of Semiconductor Displacement Lasers
The laser beam emitted from the laser diode in the transmitter is converged into a parallel beam by the lens unit. The laser beam is then directed through the slit on the receiver and focused on the light-receiving element. As the target moves through the parallel laser beam, the change in the size of the shadow is translated into the change in received light quantity (voltage). The resulting voltage is used as a comparator to generate an analog output voltage.
Industrial Applications of Laser Sensors*
Electrical and electronics industries: Warpage and pitch of IC leads. The visible beam spot facilitates the positioning of the sensor head for small workpieces. Warpage and pitch can be measured by scanning IC leads with the sensor head (Fig. 2.112). Measurement of lead pitch of electronic components. The sensor performs precise noncontact measurement of pitch using a laser beam (Fig. 2.113). Measurement of disk head movement. The laser sensor is connected to a computer in order to compare the pulse input to the disk head drive unit with actual movement. The measurement is done on-line, thus increasing productivity (Fig. 2.114). Detection of presence/absence of resin coating. The laser displacement sensor determines whether a resin coating was formed after wire bonding (Fig. 2.115).
A few nonlaser optical sensors are included, as indicated.
Two
FIGURE 2.112 IC lead.
Warpage and pitch of
FIGURE 2.113 Measurement of lead pitch of electronic components.
FIGURE 2.114 Measurement of disk head movement.
Laser disk drive
Pick-up
Controller
FIGURE 2.115 Detection of presence/absence of resin coating.
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FIGURE 2.116
Detection of double-fed or mispositioned resistors.
Detection of double-fed or mispositioned resistors prior to taping. Through-beam-type sensor heads are positioned above and below the resistors traveling on a transfer line. A variation on the line changes the quantity of light in the laser beam, thus signaling a defect (Fig. 2.116). Detection of defective shrink wrapping of videocassette. Defective film may wrap or tear during shrink wrapping. The laser sensor detects defective wrapping by detecting a change in the light quantity on the surface of the videocassette (Fig. 2.117). Measurement of gap between roller and doctor blade. Measures the gap between the roller and the doctor blade in submicrometer units. The sensor s automatic measurement operation eliminates reading errors (Fig. 2.118). Measurement of surface run-out of laser disk. The surface run-out of a laser disk is measured at a precision of 0.5 m. The sensor head enables measurement on a mirror-surface object (Fig. 2.119).
FIGURE 2.117
Detection of defective shrink wrapping of videocassette.
Two
FIGURE 2.118
Measurement of gap between roller and doctor blade.
FIGURE 2.119
Measurement of surface run-out of laser disk.
Displacement of printer impact pins. The visible beam spot facilitates positioning of the head of a pin-shaped workpiece, enabling measurement of the vertical displacement of impact pins (Fig. 2.120). Automotive manufacturing industries: Measurement of thickness of connecting rod. Measures the thickness of the connecting rod by processing the analog inputs in the digital meter relay (Fig. 2.121). Measurement of depth of valve recesses in piston head. Measures the depth of the valve recesses in the piston head so that chamber capacity can be measured. Iron jigs are mounted in front of the sensor head, and the sensor measures the distance the jigs travel when they are pressed onto the piston head (Fig. 2.122).
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