Working principle and application of strobe lamp scheme development
This paper introduces the development of strobe lamp scheme. The product is suitable for emergency help or dangerous situations. For example, at night, if the car breaks down due to failure and needs to be repaired on the highway, the strobe light will remind others to drive the car carefully to avoid collision.
Strobe lamp overview
The working principle of strobe lamp is to control the flashing frequency of flashlight according to the set frequency or external trigger frequency. As a complete system, it includes man-machine display interface, adjustment and function selection buttons, flash control module, flash power module and so on.
The difference between strobe lamp and flash lamp
Electronic flash lamp is used for general photography. It is different from strobe lamp. After each flash, the speedlight will wait for a period of time to charge the capacitor, and then flash again. Since the electronic flash lamp used for general photography is the result of early stroboscopic discharge experiments, the term "stroboscopic lamp" has gradually been widely used to refer to all electronic flash lamps. Over the years, due to incorrect use, most photographers regard "strobe light" as "electronic flash", which is widely accepted.
The strobe lamp we use now may have automatic exposure mode. How to realize automatic exposure? Speaking of it, this should be a miracle of modern electronic products.
The working principle of the automatic stroboscopic device is as follows: at the moment when the stroboscopic lamp flashes, the photosensitive element installed in the stroboscopic device will measure the light reflected by the subject. When the light illuminating the object is sufficient for normal exposure, the photosensitive element will complex electronic circuits to turn off the strobe lamp.
The greater the amount of light required for a normal subject, the longer the duration of the flash. This sounds simple, but it's not easy to decide whether to turn off the flash in only 1 / 50000 seconds. For example, in the current popular stroboscopic devices, the short exposure time is exactly 1 / 50000 seconds, while the long exposure time is only 1 / 1000 seconds. The electronic circuit selects an appropriate time to turn off the flash lamp within these two limit times.
When using the automatic strobe light, we need to carefully observe the turntable on the back of the equipment and find out the f gear on the turntable according to the ASA sensitivity of the film used. Set the aperture according to the detected value, and then shoot the subject within the flash range. The flash's manual will detail its range, such as 4 to 30 feet (about 1.2 to 9 meters). It should be noted that this automatic effect is reliable only under so-called "normal" conditions.