| 摘要 |
<p>A surface plasmon sensor comprises a substrate, a metal film, which is formed on one surface of the substrate and is brought into contact with a sample, and a light source for producing a light beam. An optical system causes the light beam to pass through a grating formed on said substrate and to impinge upon an interface between the substrate and the metal film such. that various different angles of incidence may be obtained with respect to the interface. A photodetector detects an intensity of the light beam, which has been totally reflected from the interface, with respect to each of the various different angles of incidence. A substance contained in the liquid sample is thus analyzed quickly and with a high sensitivity.
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