This research contains information around noise, positions width measurements, measurement technique, laser, and beam characteristics. In the research the reader can find info about measurements, system, propagation characteristics, parameters, and rayleigh distance.
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Current ocular safety standards associated with the application of light emitting diodes (LED), and other intermediate sources, cite the angular subtense of the apparent source as an essential quantity for optical hazard assessment. Under these standards, the angular subtense parameter is calculated from the apparent source size of the LED package and the specified most hazardous viewing distance. However, an international standard for the measurement of the apparent source size parameter does not yet exist. This report describes the results of a study that provide rigorous practical support for a technique proposed for the measurement of apparent source size when observed from the most hazardous viewing distance.
Also, this research contains information around measurement, characteristics, technique, and propagation ratio.