High-tech monitoring equipment "convoy" 2012 college entrance examination

On June 7th, the annual college entrance examination day again struck, and 9.15 million candidates nationwide entered the college entrance examination room to sprint. In a society that valued academic qualifications, the two-day college entrance examination is an important test that determines ideals and fate. For this reason, many candidates took risks and used chewing gum-type signal transmitters, rubber-based LED displays, and mineral water bottle cheats, etc. Technological devices are cheating, and there are many people who are disqualified because of fraud.

In response to the high-tech cheating that has been frequently refurbished in recent years, the Ministry of Education has for the first time modified the "Measures for Handling Non-compliance of National Education Examinations" published eight years ago and adopted a series of measures to strengthen the safety of examination papers and examination rooms to ensure fairness and justice.

Mobile phone signal shielding device, metal detector, ID card identification device and other three powerful weapons debuted on the spot to prevent fraud in the examination room.

With the coverage of the mobile phone 3G network, the mobile network has also become a key area for monitoring during the college entrance examination. In this year's college entrance examination, mobile phone signal shielding devices have been installed in the examination rooms in various regions of the country. The mobile phone signal masking device can quickly leave the phone signal in the examination room after plugging in. It can shield the mobile phone signal and can also block the weak signal in the test answer.

The metal detector, like a sword, scans around the body and can quickly detect items such as watches, mobile phones, and keys. It is very sensitive. Usually the metal detector consists of two parts, namely a metal detector and an automatic rejection device, in which the detector is the core part. Three sets of coils are distributed inside the detector, namely the central transmitting coil and two equal receiving coils. A high-frequency variable magnetic field is generated by the vibration-dropping metal detector oscillating device connected to the middle transmitting coil. The induced voltage of the side receiving coils cancel each other out before the magnetic field is disturbed and reach an equilibrium state. Once metallic impurities enter the magnetic field, the magnetic field is disturbed, the balance is broken, the induced voltages of the two receiving coils cannot be cancelled, and the unsuppressed induced voltage is amplified by the control system and an alarm signal is generated (metal impurities are detected. ).

This year's new second-generation ID card recognizer is shaped like a square box. Plugging in can identify whether the ID is true.

In addition, during the college entrance examination period, the MS2721B portable spectrum analyzer, BC3200 and PR100 hand-held direction finder, JAM7 radio control system, and IC-2410H mobile station mobile monitoring station were put into the radio management office of the examination room. Azimuth monitoring effectively ensures the safety and fairness of the college entrance exam.