To easily and precisely measure a state of total reflection attenuation by a small and inexpensive instrument.
Air is introduced into a measuring flow passage 76 before actual measurement, a p-polarized light beam 30 is made incident into an interface 12a, a light intensity distribution of the p-polarized light beam 30 total-reflected on the interface 12a is detected by a photodetector 40 of a photodiode array, and a reference light intensity distribution, that is a light intensity distribution of the p-polarized light beam 30 itself, is acquired to be stored in a measuring means 61. A sample of a measuring object is introduced thereafter into the measuring flow passage 76 to measure a light intensity distribution of the p-polarized light beam 30 total-reflected on the interface 12a. an influence of dispersion in the light intensity distribution of the light beam is offset by division with the reference light intensity distribution a distribution value by a distribution value, in the measuring means 61, to detect precisely a position of a total reflection attenuation angle θSP. The light beam comprising a p-polarized wave is usable, and a separation means for separating the light beam total-reflected on the interface 12a into the p-polarized wave and an s-polarized wave is not required to be provided.
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KIMURA TOSHIHITO
OTSUKA TAKASHI
Go Sakuma
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