Interferometer detector

Since cryogenics is not involved in interferometer detector (but the proposal of cooling mirrors has been done for VIRGO), we no longer deal with this type of detector. 

Figure 20-26 Schematic diagram of Michelson interferometer. Detector response as a function of retardation (= 2[OM - OS]) is shown for monochromatic incident radiation of wavelength X.

The device is often operated with a refractive index detector in series in order to coincidentally measure the refractive index of the eluent. This is necessary to calculate (K) from the refractive index as given in equation (5). A common refractive index detector used for this purpose is that manufactured by the Wyatt Technology Corporation and it is described as the interferometer detector in chapter 11. As discussed above the molecular weight of a solute is determined from the intercept of the graph relating... 

The Original Optical System Used by Bakken and Stenberg in Their Interferometer Detector... 

Figure 17.2.4 Block diagram for a SNIFTIRS instrument. The source, interferometer, detector, and data acquisition usually are in a commercial FTIR instrument. [Reprinted from J. K. Foley,...

An interferometer detector that is commercially available has been manufactured by Optilab which is illustrated in Figure 18 (26). 

The requirement for the uniform linear motion of the movable mirror in the continuous-scan type is imposed mainly by the frequency-response characteristics of the detector for the main interferometer. The response of the detectors to the beams (indicated by (g) and in Figure 5.4) of the laser interferometer is usually rapid, so that effects arising from the instability of the motion of the movable mirror which changes the modulated frequency can be disregarded. In contrast, the response characteristic of thermal detectors such as a pyroelectric detector commonly used for detecting the infrared beam from the main interferometer is not as rapid as that of the laser-interferometer detectors. As a result, any... 

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