Patent ID: 7492460

Claim:
An attenuated-total-reflection measurement apparatus for collecting light onto a contact surface between a sample and an ATR prism at an incident angle greater than or equal to a critical angle and for measuring total-reflection light from the contact surface, comprising: light-irradiating system for emitting the light which is collected onto the contact surface; a photodetector system for detecting the total-reflection light from the contact surface; an aperture for restricting the light which the photodetector system detects to only light from a specific site in the contact surface, to set the specific site as a measurement site; a detection-side scanning mirror provided in a light path extending from the ATR prism to the aperture; and an irradiation-side scanning mirror for guiding the light from the light-irradiating system to the ATR prism; wherein the irradiation-side scanning mirror is configured to allow the orientation of a reflecting surface thereof to be changed independent of the detection-side scanning mirror, and the irradiated position on the contact surface is changed by moving the reflecting surface of the irradiation-side scanning mirror with respect to the irradiation light from the light-irradiating system, and wherein the detection-side scanning mirror is configured to allow the orientation of a reflecting surface thereof to be changed independent of the irradiation-side scanning mirror, and the measurement site in the contact surface, which is to be measured with the photodetector system, is changed by moving the reflecting surface of the detection-side scanning mirror with respect to the total-reflection light from the contact surface, to perform mapping measurement in the contact surface.