Porch swing bearing for the linear motion of the mirror in Michelson interferometer for mid-infrared low resolution Fourier\r\ntransformspectrometer was studied experimentally using themodulation depth of the collimated laser beam.The mirror tilting was\r\nmeasured to be lower than 5 ??rad over 3mmmirror travel using two different bearings assemblies. Additionally, themanufacturing\r\ntolerances of the bearing type were proved to be loose enough not to limit the interferometer application. These demonstrate that\r\nthe porch swing without any adjustment mechanisms provides the sufficient motion linearity.
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