First, the principle of metal security doors :
A sine vibration of 3.5-4.95M is generated by the crystal, and the sine wave is divided by a frequency divider to 7.8K. After the power is amplified by the triode and the coil, it is input to the large coil of the door panel (zone 7) for electromagnetic wave emission. The district coils are separated for acceptance. After acceptance, the received signal is compared with the reference signal. After the change is found, the output level of the capture card is changed. The CPU scans the data of the 6 capture cards in 300 milliseconds to determine the metal location. Location and output appear.
Second, the structure of metal security doors:
Door panel structure: It consists of 1 large coil, 6 small coils, compensation coil and graphite.
Third, the operation process of the metal security gate internal exploration:
CPU exploration → one group of infrared is blocked → check whether the data of each acquisition card is changed → alarm → check another group of infrared → reset the exploration from the beginning.
Fourth, the use of metal security doors on different occasions:
① The device is stable, and it is strongly recommended that the device be installed in an area away from high-frequency equipment to eliminate false positives and cross-reports caused by disturbance.
② Protection from rain and sun, outdoor equipment is equipped with awnings and other equipment to increase the service life.
③ Try to stay away from large metal objects when installing.
④ Prevent nearby metal objects from moving.
Public inspection method (entertainment place): The device is stable and can meet the customer's request (security and sensitivity), and it is adjusted from low sensitivity when conditioning.
Fifth, the debugging guidance of metal security doors:
Debug from low sensitivity to high sensitivity, that is, first set the sensitivity of the door to be low, can not explore the object, stop when there is no alarm, and then increase the sensitivity in a single area in sequence, until the requested item can be explored.