| 摘要 |
PURPOSE:To measure a light absorption factor with high accuracy by a method wherein incident light is successively reflected by (n) low light absorption factor objects to form multiple reflection and the light absorption factor is obtained from the difference between the light power of the incident light and that of final reflected light. CONSTITUTION:A parallel light generator 1, the same light power meters 2a, 2b and (n) low light absorption factor objects 3-1 - 3-n having the same characteristics forming multiple reflection while successively reflecting the incident light from a parallel light generator 1 are mounted. The parallel light outputted from the parallel light generator 1 is incident to the low light absorption factor object 3-1 along a light path 101 and subsequently reflected by the low light absorption factor objects 3-2, 3-3...3-n in succession to form multiple reflection and the light power of the last reflected light is measured by a light power meter 2b. The light absorption factors of the low light absorption factor objects are almost the same. By this method, a light absorption factor can be measured with markedly high accuracy by utilizing the multiple reflection of a large number of the low absorption factor object. |
