Patent ID: 7209233

Claim:
A high-sensitivity reflection measurement apparatus disposed in an optical path between a light emitter and a detector of an analysis apparatus, the high-sensitivity reflection measurement apparatus comprising a single incident-side optical element, wherein the incident-side optical element bends the optical path of measurement light emitted from the light emitter such that the angle of incidence of the measurement light emitted from the light emitter with respect to a sample surface under measurement is a desired angle ranging from 70 degrees inclusive to 90 degrees exclusive with respect to the direction perpendicular to the sample surface under measurement, transmits the measurement light as linearly polarized light having a desired oscillation direction, and makes the linearly polarized light incident on the sample surface under measurement; and wherein information related to the sample surface under measurement is obtained according to light reflected from the sample surface under measurement when the linearly polarized light from the incident-side optical element is incident on the sample surface under measurement.