A so-called spy mirror allows to observe a bright room from a dark room. At the same time it is impossible to view from the lit room into the dark room. In the bright room, only a mirror reflection can be seen, so the observer cannot be discovered. Due to this effect, such a spy mirror is also called a one-way mirror. This one-way effect, however, is solely based on the light contrast between the two sides of the mirror, because a mirror that is transparent only from one side is not possible for physical reasons. So it is imperative for the desired function of a spy mirror, that the lighting conditions between the region to be observed and the area from which it is observed differ significantly. The space to be observed should be be illuminated as light as possible, while the room the observer is located remains as dark as possible for best results.
Our TDS spy mirror can also be used to hide surveillance video camera equipments. This works based on the same principle of different lighting conditions in front of and behind the mirror, as described before. The camera however, should be sensitive enough in order to deliver a picture bright enough.
The coating of our TDS mirrors is based on a chrome coating with only a small transmittance. It is corrosion resistant, highly resistant to water, acids and other environmental influences and it is RoHS compliant. The coated side of the spy mirror should point towards the bright room.
At adequate quantities, a thermal hardening of the spy mirror is possible as it is required for for safety relevant areas. Also available at large purchase quantities are other optical rest-transmissions and further glass thicknesses. Please send us your requirements in such cases.
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