Laser Telemetric Measuring Systems (Metrology) (old definition)
This is a high speed gauging system providing accuracy and repeatability of a contact type gauge with versatility of a non-contact type of gauge. The principle is explained below:
A thin band of laser beam projects from a transmitter to receiver. When an object is placed across the beam, the object casts a shadow. The signal from light entering the receiver is used by the microprocessor to detect the shadow and to calculate the dimension represented by the distance between the edges of the shadow. The system consists of three modules:
(Radhakrishnan P., Subrahmanyan S., Raju V., CAD/CAM/CIM, 3rd Edition, p. 513 )
Laser Telemetric Measuring Systems (Metrology) (new definiton - Better)
This is a high speed gauging system providing accuracy and repeatability of a contact type gauge with versatility of a non-contact type of gauge. The principle is explained below:
A thin band of laser beam projects from a transmitter to receiver. When an object is placed across the beam, the object casts a shadow. The signal from light entering the receiver is used by the microprocessor to detect the shadow and to calculate the dimension represented by the distance between the edges of the shadow.
The system consists of three modules: The system consists of three modules: The system consists of three modules: The system consists of three modules: The system consists of three modules:
i.Transmitter module
ii.Receiver module
iii.Processor electronics
The transmitter module contains a low power He-Ne gas laser and its power supply, a specially designed collimating lens, a synchronous motor, multi-faced reflector prism, a synchronous pulse detector and protective window. This produces a collimated parallel scanning laser beam moving at a high and constant speed. The scanning beam appears as a line of red light. The receiver module collects and photo electrically senses the laser light transmitted past the object being measured. The processor electronics takes the receiver signals and converts them to digital signal and displays the dimensions being gauged.
The information thus collected is processed not only to qualify or classify a part but also can be used to correct the manufacturing process that might have caused the undesirable deviation. This is done automatically without touching the part and without the need for human intervention. The microprocessor actuates precise computer control of continuously manufactured parts. The prompting formats guide the operator regarding the gauge setting. The operational procedures notify the operator in case any error occurs in the system by displaying error message on the CRT terminal. It also keeps the operator informed about the product in the production process, displays, prints out and records the complete measured and analyzed results
(Radhakrishnan P., Subrahmanyan S., Raju V., CAD/CAM/CIM, 3rd Edition, p. 513-514)
No comments:
Post a Comment