Interferometer maintaining optical relationship between elements

Abstract

An interferometer for Fourier transform infrared spectroscopy includes a fixed assembly including a housing, a beam splitter, and a mirror fixedly positioned relative to each other. A movable assembly includes a housing, a mirror, and a motor coil, fixedly positioned relative to each other. A first flat spring has an opening for providing an unobstructed optical path of radiation therethrough. A first end of the first flat spring is secured to the fixed assembly and a second end of the first flat spring is secured to the movable assembly for providing movement of the movable assembly relative to the fixed assembly via the first flat spring. An optical relationship between the beam splitter, the mirror of the fixed assembly, and the mirror of the movable assembly is maintained independent of a distance between the movable assembly and the fixed assembly.

Description

technical field [0001] The present invention relates to interferometers. The invention has particular application in maintaining the alignment of an interferometer and will be described with specific reference thereto. It should be appreciated, however, that the invention may also be adapted for other applications. Background technique [0002] Known Michelson interferometers have many commercial applications. It is well known that slight misalignment of optical components can lead to modulation changes that can significantly affect interferometer performance. Numerous attempts have been made in the design of commercial interferometers, including Michelson interferometers, to ensure that misalignment is reduced, or that the effects of misalignment are reduced. Some such attempts have included passive means, such as the use of right-angle mirrors, retro-reflectors, and / or other means to compensate for undesired effects. Other such attempts include active devices, such as ...

AI Technical Summary

Problems solved by technology

Until now, however, such leaf springs / bearings have required periodic alignment when the interferometer's operating environment undergoes significant temperature changes

While the means for alignment are typically accomplished by an automatic alignment algorithm (actuated by a precision stepper motor), the need for alignment often arises at inopportune times, which results in significant user inconvenience and / or frustration

Additionally, achieving alignment will incur substantial costs (money and space)

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