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PhysicsGuyB

Member Since: January 23, 2015

Country: United States

  • Typical glass attenuates IR significantly. Not sure about windshield glass though I can't imagine how it would not be even worse. There is a good chance it will not operate as well, if at all. In addition, ranging is based on time of flight which assumes the same medium for propagation. Light is slower in glass by a factor of 1/refractive index (which is a function of wavelength) so accuracy will be reduced due to air/glass/air/glass/air round trip not being the same as air round trip. Typical crown glass has nominal refractive index of about 1.52 so the glass thickness of say, 1/8 inch will look like roughly 1.52*1/8 =~ 3/16". Looking through slanted glass is worse because the actual glass path is longer, etc. I think I digressed a little.

No public wish lists :(