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.LM 10
.CHAPTER CHAPTER-II
II.	GENERAL SYSTEM DESCRIPTION
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	A.	PHYSICAL LAYOUT
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	FIGURE 1	SL-1 ARRANGEMENT
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II.  GENERAL SYSTEM DESCRIPTION
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A.  PHYSICAL LAYOUT
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THE INSPECTOR SYSTEM CONSISTS OF SIX MAJOR SUBSYTEMS (FIG. 1).
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.LIST
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(1)#A MAIN FRAME AND ROLL DRIVE ASSEMBLY LOCATED IN THE PROCESS LINE.
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(2)#A SCANNER ASSEMBLY AND SCANNER DRIVE UNIT LOCATED ON THE FRAMEWORK
AND IN THE AREA ELECTRICAL CONTROL ROOM, RESPECTIVELY.
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(3)#TWO LIGHT COLLECTOR ASSEMBLIES LOCATED IN THE BASE OF THE MECHANICAL
FRAMEWORK.
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(4)#A MAIN CONSOLE HOUSED IN TWO CABINETS ADJACENT TO THE INSPECTOR
FRAMEWORK.
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(5)#A REMOTE CONSOLE LOCATED NEAR THE WINDUP.
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(6)#AN AC AND DC CABLE ASSEMBLY INTERCONNECTING THE SUBSYSTEMS.
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IN THE SL INSPECTOR, A HELIUM-NEON LASER GENERATES A COLLIMATED
BEAM OF RED LIGHT, WHICH IS REFLECTED FROM AN EIGHT-SIDED ROTATING
MIRROR. THE REFLECTED BEAM PRODUCES A SPOT OF LIGHT THAT SCANS ACROSS
THE PRODUCT AS THE MIRROR ROTATES. THE LIGHT IS SCATTERED BY THE 
PRODUCT. (ON CHANNEL I THE LIGHT IS REFLECTED; ON CHANNEL II IT IS 
TRANSMITTED THROUGH THE PRODUCT.) SCATTERED LIGHT FROM THE PRODUCT
ENTERS AN ACRYLIC ROD COLLECTOR AND IS INTERNALLY REFLECTED AND DIRECTED
TOWARD THE FACE OF A PHTOMULTIPLIER TUBE. THE TUBE, LOCATED INSIDE
THE PHTOMULTIPLIER HOUSING, PRODUCES AN ELECTRICAL SIGNAL 
PROPORTIONAL TO THE LIGHT RECIEVED. THIS SIGNAL IS AMPLIFIED BY A 
PREAMP CARD IN THE HOUSING AND THEN TRANSMITTED TO THE CHANNEL
DRAWER.
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THE AMPLIFIED SIGNAL, KNOW AS THE "COMPOSITE PA" SIGNAL, CONTAINS
THE INFORMATION USED TO DETERMINE PRODUCT QUALITY. IT HAS TWO
SEPARATE COMPONENTS PRODUCED BY THE SCANNING ACTION OF THE DEFLECTED 
LASER BEAM. THE LIGHT FIRST PASSES THROUGH A FILTER IN THE 
AUTOCALIBRATION ASSEMBLY, WHICH PRODUCES THE FIRST COMPONENT CALLED
"SELF-CHECK." NEXT THE PRODUCT IS SCANNED PRODUCING THE "PRODUCT
PEDESTAL" COMPONENT. PRODUCT DEFECTS ENCOUNTERED DURING A 
SCAN WILL EITHER INCREASE OR DECREASE THE AMOUNT OF SCATTERED
LIGHT. CORRESPONDINGLY A CHANGE WILL BE PRODUCED IN THE "PRODUCT
PEDESTAL." NOTE THAT THE LIGHT PASSING THROUGH THE SELF-CHECK
ASSEMBLY DOES NOT INTERACT WITH THE PRODUCT. THUS, THE FIRST 
COMPONENT IS AN INDEPENDENT REFERENCE THAT CAN BE USED TO TEST 
THE SYSTEM.
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THE "COMPOSITE PA" SIGNAL IS PROCESSED BY THE CHANNEL DRAWER
ELECTRONICS. IF A DEFECT IS DETECTED, A SIGNAL IS SENT TO THE
PROPER LANE PRINTER IN THE REMOTE CONSOLE AND ITS LOCATION, TO THE
NEAREST YARD, WILL BE RECORDED.
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EACH CHANNEL HAS ITS OWN DC POWER SUPPLY FOR OPERATING THE CARDS
IN THE CHANNEL DRAWER AND PHOTOMULTIPLIER HOUSING.
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FIGURE 1
.CHAPTER CHAPTER-III
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