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Security X-ray imaging technology detailed analysis
The X-ray inspection machine is mainly composed of X-ray tube and X-ray machine power supply and control circuit. The X-ray tube is composed of Cathod, Anode and vacuum glass tubes. The X-ray machine power can be divided into The high voltage power supply and the filament power supply are two parts. The filament power supply is used to heat the filament. The high voltage output terminal of the high voltage power supply is located at both ends of the cathode filament and the anode target, respectively, to provide a high voltage electric field to accelerate the active electrons on the filament to the anode target. Form a high-speed electron flow.
X-ray imaging principle of the security X-ray machine produces three ways to generate X-rays: Bremsstrahlung, electron capture, internal conversion, X-ray machine X-ray generation mechanism is Bremsstrahlung radiation.
In the X-ray imaging principle of security inspection, X-ray was discovered by Professor Lunchen in 1895. This type of radiation emitted by the vacuum tube and capable of penetrating the object has stronger energy than visible light in the electromagnetic spectrum. The wavelength is shorter and the frequency is higher. The similar radiation includes cosmic rays, X-ray, etc. X-Ray must have an X-ray tube, and the basic structure of the X-ray tube must have:
Cathod filament;
2. Anode (Anode);
3, vacuum glass tube (Evacuated glass envelope);
4, of course, also have power supply.
The procedure for the generation of the line is to first turn on the power supply and then through a step-down transformer for heating the X-ray tube filaments to generate free electrons and gather around the cathode. When the step-up transformer provides high voltage to both X-ray tubes, the potential difference between the cathode and the anode sharply increases. The free electrons in an active state are attracted by force and cause the bundled electrons to travel from the cathode to the anode at high speed. , strike the anode tungsten target atomic structure. At this time, energy conversion occurred, in which about 1% of the energy formed X-rays, and the remaining 99% was converted into heat energy. The former is mainly emitted from the X-ray tube window, and the latter is distributed by XRAY to provide corresponding feedback signals for the closed loop control. Pulse width modulation technology is used for closed-loop control. The operating frequency is about 30KHZ. The voltage and current are closed-loop adjustment and there is overvoltage. Flow protection.
The security inspection machine uses the conveyor belt to send the checked baggage into the tracked channel. After the baggage enters the channel, the light barrier signal will be blocked and the detection signal will be sent to the control unit, triggering the ray source to emit the X-ray beam. A very narrow fan-shaped X-ray beam passed through a collimator penetrates the baggage items on the conveyor belt onto a dual-energy detector. The high-efficiency semiconductor detector converts the received X-rays into electrical signals. These weak current signals It is directly quantified, transmitted to the industrial control computer for further processing via a universal serial bus, and is subjected to complex operations and imaging to obtain high-quality images.
These are the principles of the X-ray shield security X-ray imaging technology. After understanding, we can better use the security X-ray machine in practice to better use the security inspection to protect people's safety.