First, what is the source strobe?
Here we need to distinguish between stroboscopic and stroboscopic effects:
1. Strobe: The strobe of the light source is the rapid and repeated change of the light emitted by the light source with time, making the light source jump and unstable. It refers to the depth of fluctuation of the luminous flux of the electric light source. The greater the fluctuation of the luminous flux, the more severe the stroboscopic. The depth of fluctuation of the luminous flux of the electric light source is directly related to the technical quality of the electric light source.
2, stroboscopic effect: refers to the harmful effect of the electric light source caused by the fluctuation of luminous flux, that is, the harmful effect of stroboscopic. The more severe the strobe of the electric light source, the more serious the stroboscopic effect is. The stroboscopic and stroboscopic effects are two mutually causal physical quantities that characterize the magnitude of the electric light source, the fluctuation depth of the luminous flux, and the resulting hazard effect (called the stroboscopic effect).
Second, the cause of the strobe light source
The technical mechanism of generating stroboscopic has both the factors of power supply, the factors behind the performance of electric light source technology, and the unreasonable lighting design. And it is the result of a combination of many factors, we only analyze from the perspective of the performance of common electric light source technology.
1, the illuminant drive electric power frequency is low
2. The electric light source supply voltage fluctuates greatly
3, electric light source performance
Here, we need to elaborate, because the incandescent lamp directly heats the radiant heat radiation source of the filament, and the illuminating power of the illuminator must fluctuate with the sine wave law with the frequency of the power supply. High-pressure mercury (sodium) lamp, straight tube type (inductive) fluorescent lamp, although it is an electric light source for gas discharge illumination. However, due to its start-up and ignition, inductive ballasts are used (the AC-DC-AC frequency conversion function is not available). Therefore, the discharge power of the gas discharge illuminator necessarily fluctuates with the frequency fluctuation of the power supply. The effects of voltage fluctuations can be quantified using two concepts: the visual sensitivity coefficient curve and the flicker voltage limit curve. The light source that can be perceived by the human eye flickers, and the sensation characteristic of the human eye to the light source flicker can be measured by a statistical method. When the blinking rate is above 40 Hz, the feeling is insensitive; the flashing above 50 Hz has no feeling at all.
Third, the common types of strobe light source:
1. Periodic flashing of illumination: such as stroboscopic flashing of AC fluorescent lamps and flickering of light source due to fluctuations in power supply voltage;
2. Illumination non-periodic flashing: If the AC fluorescent lamp starts to flash, various faults flash;
3. Display device flicker: such as flashing caused by scanning display of TV, computer, electronic game machine, advertising screen, etc.
4, artistic lighting flashing: such as neon lights, lanterns and laser flashing.
Fourth, the harm of the source strobe
The strobe of the light source is irritating to the human visual system and creates an uncomfortable feeling. People who work or live in the blinking light for a long time may also affect the physical and mental health of the visual system. The severity of this stimulating effect or effect is related to the intensity, frequency, duration of action, and long-term nature of the source's flicker. This effect is often slow, so it has not attracted people's attention for a long time. The stroboscopic and stroboscopic effects of electric light sources have brought serious harm to our work and life.
So what harm does strobe have to the human eye?
1. The illusion causes an accident at work
When the stroboscopic frequency of the electric light source is in integral multiple with the speed (rotation speed) of the moving (rotating) object. When the motion (rotation) state of a moving (rotating) object occurs, the static, reverse, motion (rotation) speed is slow, and the above three states periodically repeat the wrong vision, causing a work-related accident. For example, in the machining industry, machine tool operators, the illusion of reverse rotation is reversed. The emergency reversing operation, damage to the workpiece, the tool, and even cause casualties.
2, endangering health
The stroboscopic effect can cause visual fatigue and migraine. In particular, the machinery industry uses high-pressure mercury (sodium) lamps, and light industry, food, printing, electronics, textile and other industries, the use of straight tube (inductive) fluorescent lamps is particularly obvious. For example, the plug-in operator of the running water online is prone to migraine due to visual fatigue and vertigo. It is difficult to locate and the production efficiency is low.
3, damage to young people's vision
In recent years, straight-tube (inductive) fluorescent lamps have been widely used in homes, schools, libraries, etc. Growing students have suffered the most. There are data showing that reading in the stroboscopic environment has found that many young people show significant loss of vision. There is a significant increase in myopia.
Fifth, the countermeasures to solve the stroboscopic effect
The fundamental technical countermeasure for eliminating the stroboscopic and stroboscopic effects of the electric light source is to increase the driving electric power frequency of the discharge light emitted by the illuminant of the electric light source, so as to reach 40 KHz or more. Compared with energy-saving lamps, the technical measure to eliminate the stroboscopic and stroboscopic effects is to increase the electronic ballast, AC-DC-AC (AC-DC-AC) conversion frequency. If the strobe depth of the energy saving lamp is limited to 5% or less. The luminous flux emitted by the energy-saving lamp will form a smooth and stable effect in the human vision, and no longer cause stroboscopic effects.
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