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Mirau interferometer
A Mirau interferometer works on the same basic principle as a Michelson interferometer. The difference between the two is in the physical location of the reference arm.〔(【引用サイトリンク】title=Phase-shifting Mirau interferometry )〕 The reference arm of a Mirau interferometer is located within a microscope objective assembly.
A schematic of a Mirau interferometer is shown on the right. At the beam splitter the source light is split into a reference path (reflected) and a sampling path (transmitted onto the sample). On the comparison face there is a mirrored circle in the middle. The two paths recombine to form an interference image. By changing the z position of the sample, interference images are acquired at a sequence of path (phase) differences: 0, λ/4, λ/2, and 3λ/4. These interference maps are functions of background intensity, fringe modulation, and phase. Three such images provide enough information to solve for the topographic image of a sample.
This orientation is often used in optical profilometers due to the increase in stability between the sample and reference path lengths.
==Immersion Mirau Interferometer〔Lyulko OV, Randers-Pehrson G, Brenner DJ. Immersion Mirau interferometry for label-free live cell imaging in an epi-illumination geometry. ''Proc. SPIE'' 7568 756825 (2010). http://dx.doi.org/10.1117/12.855651〕==
An immersion Mirau interferometer is a modification of a Mirau interferometer, in which the light path is immersed in a liquid medium. One application of an immersion Mirau interferometer is to image cells with medium. Since the index of refraction of the medium is substantially different from that of the neighboring air, each millimeter of medium would introduce a path length difference from the reference wave, and ideal interference conditions are lost. Filling the microscope optics with medium restores the ideal interference conditions.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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