| 摘要 |
In a method of monitoring a freeze drying process conducted in a chamber (12) housing a sample (14) to be freeze dried, a set of optical interference fringes (40) is formed from the crossing of two coherent light beams (30,32) within a duct (20) conveying water molecules (23) from the chamber (12) to a condenser (22). A detector (42,46) detects light diffused by the water molecules (23) as they pass through the interference fringes (40) to determine the presence of water molecules (23) within the duct (20). From the detected light, information regarding the water molecules (23), for example, velocity and amount, can be obtained. |
