mount bolt and at that point a sensor switch is either tripped or not tripped by the way the gun is mounted to the robot fig5 is table 1 showing the transmittance for various shades that the window is set at from clear to shade number 14 the specific values of luminous transmittance for shades ranging from 9 to 12 and 6 to 8 can be identified when the booth is used for plasma spray coating the ultraviolet light produced has a wavelength ranging from 280 to 220 nanometers at greater than 30 w m 2 window 37 would be darkened to a shade ranging from 9 to 12 hvof ultraviolet light at grater than 30 w m 2 has a peak wavelength of 280 to 360 nanometers window 37 would be darkened to a shade ranging from 6 to 8 liquid crystal windows use liquid crystals which are a state of matter having properties between those of a conventional liquid and those of a solid crystal liquid crystals find wide use in liquid crystal displays that rely on the optical properties of certain liquid crystalline substances in the presence or absence of an electrical field in a typical device a liquid crystal layer sits between two polarizers that are crossed oriented at 90 u00b0 to one another the liquid crystal alignment is chosen so that its relaxed phase is a twisted one this twisted phase reorients light that has passed through the first polarizer allowing its transmission through the second polarizer the device thus.