Source of UV radiation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Radio amateurs working with memory chips with ultraviolet erasure, from time to time, need a powerful source of UV radiation. Industrial devices for this purpose are inaccessible to many. It is especially difficult to find a UV source in rural areas.
Meanwhile, a sufficient power source of UV radiation may well be produced by any radio amateur with even poor practical skills. This will require the ubiquitous DRL street lighting lamp.
The industry produces several types of such lamps for different powers. The lamp consists of two glass flasks - external and internal. In the internal, filled with mercury vapor, when the supply voltage is applied, an arc discharge occurs, which is a source of radiation in a wide spectrum. Ultraviolet occupies a significant share in this spectrum. The inner surface of the outer bulb is covered with a layer of phosphor, which converts the resulting radiation into visible light.
To make a UV source, the outer flask must be removed. The lamp is wrapped in a thick cloth and clamped between the jaws of a large vise. Gradually squeeze the sponges until the glass cracks. After that, the fragments are carefully removed and the remains of the glass are broken off up to the lamp base; the inner flask should remain intact.
Perform this operation outdoors and be extremely careful. First, in order not to cut yourself with glass fragments, be sure to work in strong, hard gloves. Secondly, try to protect yourself and others from getting phosphor powder in your eyes, nose, mouth, because it contains additives that are very harmful to health. For this reason, the fabric should be moistened with plenty of water before wrapping the lamp.
Third, take precautions against spilling mercury if the inner bulb is accidentally broken.
Now the base with the inner bulb is carefully screwed into the standard cartridge, being careful not to damage the current-carrying conductors. The bulb holder is placed in a tin casing which is to protect the lamp from damage and, in particular, the eyes of the user and others from the harmful effects of UV radiation.
The lamp is connected to a network of 220 V, 50 Hz through a standard ballast choke, corresponding to its power. Instead of a choke, you can use a conventional 220 V incandescent lamp with a power of 100 ... 150 W.
To erase information, the PROM chip of the K573 series, for example, is placed at a distance of 10 ... 15 cm from the lamp. If the lamp power is 125 W, then 30 minutes is enough for complete erasure.
I have been using the described source of ultraviolet for more than five years. It is also suitable for disinfecting premises during epidemics, as well as cellars and cellars.
Author: N.Tsesaruk, Gula
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