| 摘要 |
A method of, and apparatus for, determining water ingression into a tablet. The method comprises irradiating a tablet with pulsed radiation having at least one frequency in the range from 40GHz to 100THz, detecting radiation which has been transmitted through or reflected by the tablet, identifying detected radiation in terms of penetration depth of radiation within said tablet, plotting a quantity at least related to the amplitude of the detected radiation for a plurality of points to obtain an image and deriving information about water ingression by identifying areas of high absorption within the tablet. The image may be produced using points substantially parallel to the direction of incident radiation or of points in a plane substantially perpendicular to the direction of radiation incident on said tablet. |
