| 摘要 |
The invention provides a filtering device and method and a substance detection device and method. The filtering device comprises a dual-energy ray source and a filtering sheet, wherein the dual-energy ray source is used for emitting high-energy rays and low-energy rays, and the filtering sheet is located at the ray emitting-out portion of the dual-energy ray source, is made of high-Z materials and is used for filtering the emitted-out high-energy rays and the emitted-out low-energy rays. According to the filtering device and method and the substance detection device and method, as the one filtering sheet with the large atomic number is adopted for the x rays different in energy, the low-energy ingredients in a detection energy spectrum are remarkably reduced, a substance detection mode larger in separability coefficient is achieved, and therefore the more excellent system classification detection performance is obtained. |
