| 摘要 |
An automatic adjustable radiant energy filter system adapted for protecting human eyes (and other optical devices) from dangerous intensities of laser light or other types of radiation during experimentation therewith is disclosed as including a pair of relatively moving polarized filters, one of which is automatically positioned with respect to the other as a consequence of a unique photodetector and negative feedback system combination sensing and controlling the aforesaid laser light radiation that passes therethrough in accordance with a predetermined intensity level. Fixed filters may be selectively mounted in front of said polarized filters, in order to control the amount and frequency of ambient radiant energy supplied thereto; and a shutter and unique control subsystem therefor are combined with the aforesaid photodetector in such manner as to completely stop said laser light radiation from being supplied thereto whenever the intensity thereof exceeds a given dangerous level, thereby completely protecting the aforesaid human eyes therefrom, too.
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