FTIR step-scan interferometer

A multiplex/multichannel microimaging FTIR system has been developed. The strategy is to combine an IR focal plane array detector with a step-scan interferometer. A InSb focal array detector was used with a 128 x 128 pixel distribution. The detector was interfaced with a with a commercially available step-scan FT-IR interferometer. 

The schematic in Figure 7.3 shows a simplified layout for an FTIR microspectrometer based on a staring-type FPA detection system. The FTIR spectrometer is similar (if not identical) to that used in the scanning instrument, except that it may require step-scan to allow time for reading out all pixels of the FPA at each optical retardation (scanning mirror position) of the interferometer. The system also uses Schwarzschild objectives, but the apertures for constraining the microscope s sensitive location are left open, i.e. they do not provide any spatial discrimination. Thus, the microscope s first objective... 

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