| 摘要 |
PROBLEM TO BE SOLVED: To obtain the evanescent ellipso-sensor which can analyze substances in sample liquid in a short time with high sensitivity. SOLUTION: A transparent electrode 12 which is brought into contact with the sample liquid 11 is formed on one surface of a prism 10 and the light beam 13 from a light source 14 is polarized by a polarizer 15 and aλ/4 plate 16 as specified and made incident on the boundary surface 10a between the prism 10 and transparent electrode 12. A change in the polarized state of the light beam 13 which is caused by its total reflection is detected by an analyzer 17 and a photodetecting means 18. A counter electrode 19 is arranged opposite the transparent electrode 12 across the sample liquid 11 and a DC voltage is applied between the electrode 19 and transparent electrode 12 by a DC power source 21.
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