Almost all airport metal detectors are based on pulse induction. Typical PI systems use a coil as the arch side of the transmitter and the receiver. The technology sends a strong electric current through a wire coil, a short time (pulse). Each pulse generates a brief magnetic field. When the pulse ends, the magnetic field polarity reversal collapse is very suddenly, resulting in a sharp electrical spike. This spike lasts a few microseconds (millionths of a second) and causes another current to run through the coil. Thereafter, the current is called the reflected pulse and lasts only about 30 microseconds. Another pulse and then repeat the process is sent. A typical PI-based xray baggage scanner sends about 100 pulses per second, but the number can be pulsed according to the manufacturer and model, ranging from about 25 per second to over 1000 vary widely.
All of this cargo has to be checked before it is loaded. Most airports use one of three systems to do this: The first is medium x ray machine. Secondly, they are mobile X-ray security machines. Mobile X-ray security machines are large truck carry complete X-ray scanning system. The last are Fixed-site - security machines. This is an entire building that is basically one huge X-ray scanner. A tractor-trailer is pulled into the building and the entire scanned once. These cost-effective X-ray security machines are the most popular in large airports. So it is important for the institutions and corporations to choose cost-effective X-ray equipment. Cost-effective X-ray security machines help to save the cost and ensure the security at the same time. If you have any questions about how to buy cost-effective X-ray security machines, working principles of X-ray security machines, you are welcomed to visit www.eastimagesecurity.com.
没有评论:
发表评论