Detecting system based on terahertz wave

A detecting system based on terahertz wave, comprising:

• a terahertz wave source, wherein the terahertz wave source comprises:
• a substrate;
• a plurality of first electrodes and a plurality of second electrodes located on the substrate;
• and
• a plurality of terahertz reflex klystrons electrically connected to the plurality of first electrodes and the plurality of second electrodes, wherein each of the plurality of terahertz reflex klystrons comprises:
• an electron emission unit being configured to emit a plurality of electrons, the electron emission unit defining a first opening;
• a resonant unit comprising a resonant cavity frame defining a resonant cavity, the resonant cavity frame comprising a top wall and a bottom wall, the top wall and the bottom wall facing each other;
• and the bottom wall comprising a bottom opening, the top wall comprising a top opening and at least one outputting hole, and the bottom opening and the first opening are aligned with each other;
• and
• an output unit being configured to output the terahertz wave, and the plurality of electrons being transferred to the output unit from the at least one outputting hole;
• a detector spaced from the terahertz wave source;
• and
• a controlling computer connected to both the terahertz wave source and the detector.