Nondestructive Detection Method for Drugs in the Medical Box Based on 3-D THz Imaging

A nondestructive detection method for drugs in the medicine box base on three dimensional terahertz imaging is proposed in this paper. It is able to complete nondestructive detection without opening the medical box by using the characteristics of high resolution, penetrating and security. An active 3-D THz imaging system consists of a vector network analyzer, a THz spread spectrum device, THz antennas, and a mechanical scanning system is used. The operating frequency of the imaging system is from 220GHz to 325GHz. A modified range migration algorithm is adopted after a phase calibration. As a result, drugs in the medicine box with missing one are detected via the 3-D THz imaging system with a high resolution. The 3-D imaging result is consistent with the reality which proves that the detecting method base on 3-D THz imaging for drugs in the medical box is effective.