| 摘要 |
PURPOSE:To enable detecting chemical matter or chemical quantity selectively and with high sensitivity letting the laser light go in a high refractive index prism and detecting the intensity of light reflected at the metal thin film surface of the prism. CONSTITUTION:On the surface of a high refractive index prism 1, a metal thin film 2 capable of exciting surface plasma oscillation is coated. On the metal thin film 2 surface, a thin film (sensor film) 3 mixed with color identification test reagent is coated. The laser beam 5 is introduced in the high refractivity prism 1 to irradiate the metal thin film 2 surface. The incident angle of the laser beam to the metal thin film 2 surface is set in an angle surface plasmon is excited in the boundary between the metal thin film 2 and the sensor film 3. The change in the reflection light intensity emitted from the prism 1 is measured with a photo-electro detector 6 using the absorbance intensifying method due to surface plasma wave. In this manner, the measurement of chemical matter and chemical quantity is enabled in process and with high sensitivity.
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