Michelson interferometer optical diagram

Figure 10.11—Optical arrangement of a Fourier transform IR spectrometer, a) A 90c Michelson interferometer including the details of the beam splitter (expanded view) b) optical diagram of a single beam spectrometer (based on a Nicolet model). A weak intensity HeNe laser (632.8 nm) is used as an internal standard to measure precisely the position of the moving mirror using an interference method (a simple sinusoidal interferogram caused by the laser is produced within the device). According to the Nyquist theorem, at least two points per period are needed to calculate the wavelength within the given spectrum.

Figure 3.4-1 Optical diagram of a commercial Michelson interferometer for infrared and Raman spectroscopy (Bruker IFS 66 with Raman module FRA 106). CE control electronics, D1/D2 IR detectors, BS beamsplitter, MS mirror scanner, IP input port, S IR source, AC aperture changer, XI — X3 external beams, A aperture for Raman spectroscopy, D detector for Raman spectroscopy, FM Rayleigh filter module, SC sample compartment with illumination optics, L Nd.YAG laser, SP sample position.

For transmission measurements where the Stimple is placed in one arm of the Michelson interferometer, a special optical arrangement is useful where the waves transmitted or reflected from the beam splitter to the mirrors and reflected by the mirrors travel at different heights. Fig. 32 is a schematic diagram of the arrangement developed by E. E. Bell one of the pioneers in this field. The major... 

Figure 10.8 The optical assembly of a Fourier transform apparatus, (a) 90° Michelson interferometer with below, some details of the beam-splitter (b) the optical diagram of a single beam spectrophotometer (picture of Shimadzu model 8300). A low power He/Ne laser is used as an internal standard (632.8 nm) in order to locate with precision the position of the mobile mirror by an interference method (this second sinusoidal interferogram which follows the same optical pathway, is used by the software to determine the optical path difference).

Figure 4.10 (Top) Schematic diagram of a Michelson interferometer. ZPD stands for zero path-length difference (i.e., the fixed mirror and moving mirror are equidistant from the heamsplitter). (From Coates, used with permission). (Bottom) A simple commercial FTIR spectrometer layout showing the He-Ne laser, optics, the source, as well as the source, interferometer, sample, and detector. [Courtesy of ThermoNicolet, Madison, WI (www.thermonicolet.com).]...

Figure 4.12 Optical path difference (OPD) for an oblique beam, (a) Oblique beam in the Michelson interferometer and (b) diagram for deriving the OPD for the oblique beam.

FIGURE 2.2 The optical diagram of a Michelson interferometer. 2011 hy Taylor Francis Group, LLC... 

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