What is the name of the glass in the interrogation room of the police station that can only see the other side on one side?

One-way perspective glass. Also known as atomic mirror, SLR mirror, SLR glass, double mirror and unidirectional glass, it is a kind of glass with high reflectivity for visible light, which realizes unidirectional visibility by using the principle of optical reflection.

When making SLR glass, a layer of photosensitive material is coated on the glass surface, so it has a very strong reflection effect in the environment with visible light. Under the illumination of light, it is a bright mirror. You can't see the inside from the outside, but you can see the outside clearly from the inside.

Extended data

SLR glass is mainly used in public security, courts, inspection institutes, school psychological counseling rooms, observation classrooms, hospitals, bars, clubs and other places that need one-way effect.

1. One-way perspective glass is divided into front and back. The front is a glass mirror that reflects light. When installing, the front should face the monitored room (that is, the observed space, such as the space where the suspect is located). ); Turn the reverse side to the position of the judge (that is, the monitoring room).

2. The light intensity of the monitored room should ensure sufficient brightness. The brighter and stronger the light in the monitored room, the more obvious the one-way perspective effect of the glass.

3. In order to make the glass achieve the best one-way perspective performance, ceiling lamps are not installed in the monitoring room in principle, and other light sources are not allowed to exist. If there is a window next to the monitoring room, opaque curtains must be installed, such as sealed curtains for hotels. When in use, it is recommended to turn off all lights in the monitoring room.

4. If the monitoring room must use lighting, it is suggested to use point lighting, such as writing desk lamp (lampshade is opaque) to narrow the lighting range, and the lighting ratio between the monitoring room and the monitored room should be controlled at 1: 3, or lower, so as to ensure the one-way perspective performance of the glass is intact.

Note: the lamp can't be installed directly behind the glass, so as not to reflect the images of people in the monitoring room on the glass surface.

5. In order to enhance the overall reflectivity of one-way glass, it is suggested to install spotlights above or below the glass mirror to enhance the overall reflectivity of the glass mirror and improve the one-way perspective effect of the glass.

6. The actual distance between the monitored personnel and the one-way perspective glass should be kept at ≥1m..

7. One-way perspective glass is a special kind of glass, and attention should be paid to protecting the mirror surface of the glass during installation. Once the mirror is damaged, it cannot be repaired.

Baidu encyclopedia-SLR glasses

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