| 摘要 |
PROBLEM TO BE SOLVED: To stably and precisely measure a characteristic change by photothermal effect of a sample with enhanced sensitivity while preventing increase in power consumption or cost, reduction in S/N ratio or extension of a measuring time; and to obtain a stable measurement result, even in the case that a cell causes a characteristic change by excitation light irradiation in measuring a sample stored in the cell, without being influenced by this. SOLUTION: The refractive index change by photothermal effect of the sample 5 is measured by measuring a phase change by excitation light irradiation of a measuring light P1 passed through (transmitted by) the sample by use of a light interference method, or based on a phase difference between a reference light P2 and the measuring light P1. In this case, the measuring light P1 is passed through both the cell 6 and the sample 5, but the reference light P2 is passed through only the cell 6. COPYRIGHT: (C)2005,JPO&NCIPI
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