Patent ID: 9164031
Filing Date: 2015-10-20
Classification: G01B,G01N

Abstract:
1. A measurement apparatus configured to obtain a physical property of an object to be measured including a first reflection portion and a second reflection portion, comprising: a generating unit configured to generate electromagnetic wave pulses; a detection unit configured to detect the electromagnetic wave pulses from the object; a delay unit configured to adjust an optical path length difference between a light path length of a first excitation light reaching the generating unit and a light path length of a second excitation light reaching the detection unit, or a time difference between a timing when the first excitation light reaches the generating unit and a timing when the second excitation light reaches the detection unit; a shaping unit configured to collect the electromagnetic wave pulses on the object; a waveform obtaining unit configured to refer to an output from the detection unit and an amount of adjustment of the delay unit to construct a time waveform of the electromagnetic wave pulses; a collecting position adjusting unit configured to adjust a relative position between the object and a collecting position of the electromagnetic wave pulses collected by the shaping unit substantially along an optical axis of the electromagnetic wave pulses; a measurement position information obtaining unit configured to obtain a first position information when an interface between a light collecting process region and a light collimated region of the electromagnetic wave pulses collected in the shaping unit matches the first reflection portion and a second position information when the interface matches the second reflection portion, based on a change of the time waveform obtained in the waveform obtaining unit with a change of the relative position; and a physical property obtaining unit configured to obtain a physical property of a region between the first reflection portion and the second reflection portion based on information of the first position information and the second position information obtained in the measurement position information obtaining unit.