Mail detection device and method

A mail detection device, characterized in that the device comprises a broad-band terahertz generator, a collimator, a beam splitter, a fixed reflector, a movable reflector, a wave buncher, a matrix detector, an acquisition card and an information processing module;

• wherein,
• the broad-band terahertz generator is used for generating and sending initial terahertz waves of the broad band;
• the collimator is used for collimating the initial terahertz waves to form parallel terahertz waves;
• the beam splitter is used for splitting the parallel terahertz waves into two beams, namely a first terahertz wave and a second terahertz wave;
• the fixed reflector, position fixed, is used for reflecting the first terahertz wave to form a first reflective terahertz wave;
• the movable reflector, capable of moving to different positions, is used for reflecting the second terahertz wave to form a second reflective terahertz wave;
• the wave buncher is used for bunching the first reflective terahertz wave and the second reflective terahertz wave to the matrix detector, wherein when the movable reflector moves and the first reflective terahertz wave and the second reflective terahertz wave form interference terahertz waves, the interference terahertz waves are bunched to the matrix detector;
• the matrix detector is used for detecting intensity signals of the terahertz waves, converting the intensity signals of the terahertz waves into electric signals, and sending the electric signals to the acquisition card;
• the acquisition card is used for acquiring the electric signals sent by the matrix detector and transmitting the electric signals to the information processing module;
• the information processing module is used for generating a terahertz image of a mail to be detected according to the electric signals sent by the acquisition card when the movable reflector is motionless;
• and when finding suspicious articles according to the terahertz image of a mail to be detected, the information processing module controls the movable reflector to move, and generates spectral information of the suspicious articles according to an electric signal sequence sent by the acquisition card during the movement of the movable reflector.