Interferometer with single-axis robot: design, alignment and performance

Alexey Shakun; Aleksandr Santos-Skripko; Oleg Sazonov; Igor Maslov; Nikolay Ignatiev; Igor Stupin; Gabriele Arnold; Alexey Grigoriev; Oleg Korablev

doi:10.1117/12.2535436

9 September 2019 Interferometer with single-axis robot: design, alignment and performance

Alexey Shakun, Aleksandr Santos-Skripko, Oleg Sazonov, Igor Maslov, Nikolay Ignatiev, Igor Stupin, Gabriele Arnold, Alexey Grigoriev, Oleg Korablev

Author Affiliations +

Proceedings Volume 11128, Infrared Remote Sensing and Instrumentation XXVII; 111280G (2019) https://doi.org/10.1117/12.2535436
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

An interferometer is an essential subsystem of the Fourier-transform spectrometer (FTS). We describe an FTS instrument to operate at the surface of Mars based on a Michelson interferometer with hollow retroreflectors. The instrument will operate in two different regimes, observing the solar disc through the atmosphere to measure trace gases, and measuring the thermal emission from the atmosphere to study the planetary boundary layer (PBL). The interferometer has an aperture of 1 inch, operates in the spectral range 1.7-17 μm, and features low mass and volume (≤1 kg with all necessary subsystems). Beam splitter and compensator are made of potassium bromide (KBr). A single-axis robot with stepper motor drive provides a linear movement of the retroreflector (the speed stability is about 2%) and enables a maximal optical path difference (MOPD) of 15 cm. A reference channel with a distributed-feedback laser diode (0.76 μm) and a photodiode (Si) supports the interferogram sampling and the speed stabilization loop. The time to measure one interferogram with a best spectral resolution of about 0.05 cm^–1 is 500 s (the sun tracking regime). In the thermal sounding regime, one measurement of a two-side interferogram (with the spectral resolution of ~1 cm–1) takes less than 1 min. Laboratory calibrations with a black body and a laser confirm the design parameters of the instrument.

Conference Presentation

Citation Download Citation

Alexey Shakun, Aleksandr Santos-Skripko, Oleg Sazonov, Igor Maslov, Nikolay Ignatiev, Igor Stupin, Gabriele Arnold, Alexey Grigoriev, and Oleg Korablev "Interferometer with single-axis robot: design, alignment and performance", Proc. SPIE 11128, Infrared Remote Sensing and Instrumentation XXVII, 111280G (9 September 2019); https://doi.org/10.1117/12.2535436

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