SURFACE PLASMON SENSOR AND DARK-LINE LOCATOR

Japanese Patent JPH1137934

A

PROBLEM TO BE SOLVED: To enhance the sensitivity by constituting a light detecting means of a light receiving face extending in the spreading direction of a light beam component totally reflected on an interface, and a photodiode having electrodes connected with the opposite ends thereof thereby enhancing the detecting speed. SOLUTION: A light detecting means PSD comprises a light receiving face extending in the spreading direction of a light beam component which can receive each component of a light beam totally reflected on an interface, and a photodiode having electrodes 21, 22. More specifically, the PSD comprises three layers of P layer 16, N layer 17 and I layer 18 all components of a light beam totally reflected on an interface impinge on the P layer 16. Charges are generated from the impinging position of each component of an incident light beam and a photocurrent is divided in reverse proportion to the distance from each position to both electrodes 21, 22. Consequently, the sum of photocurrents generated by respective beam components is outputted from both electrodes 21, 22 while being divided. The total reflection attenuation angle is determined by locating a dark-line and a specific substance in a sample is analyzed quantitatively.

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NAYA MASAYUKI

JP19149697A

February 12, 1999

July 16, 1997

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FUJI PHOTO FILM CO LTD

G01B11/00; G01B11/26; G01N21/27; G01N21/41; H01L31/00; (IPC1-7): G01N21/27; G01B11/00; G01B11/26; H01L31/00

JPH06167443A	1994-06-14
JPH08194557A	1996-07-30
JPH05240787A	1993-09-17

Seiji Yanagida (1 person outside)

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