Abstract
We demonstrate a novel tempo-spatial mixed-modulation Fourier-transform infrared imaging spectrometer. The static interference channel based on a stepped micro-mirror contributes a compact system with high stability. The instrument functions in two spectral bands ranging between 3.7- 4.8 μm and 7.7-9.3 μm, and the spectral resolution of the dual-interference channels achieves 51.5 and 4.1 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> , respectively. The instantaneous field of view is 0.15 mrad, and the working F/1.93 enables high optical throughput. The optical design and tolerance are presented with experimental investigation results, showing attractive potential in remote sensing application.
Highlights
Capable of simultaneously obtaining images and spectral information [1], [2], imaging spectrometry is widely used as a non-contact detection instrument in environmental pollution monitoring, hazardous gas detection, and aerospace remote sensing [3]–[6]
BASIC WORKING PRINCIPLE Figure 1 depicts the basic structure of the TSMIFTS, consisting of a front common-aperture telescope, dual-interference modules, a medium-wave infrared (MWIR) and long-wave infrared (LWIR) rear imaging system, and a folding mirror to realize a compact structure
Two stepped micro-mirrors with different step heights are used in the two interference channels to generate optical path differences (OPD)
Summary
Capable of simultaneously obtaining images and spectral information [1], [2], imaging spectrometry is widely used as a non-contact detection instrument in environmental pollution monitoring, hazardous gas detection, and aerospace remote sensing [3]–[6]. BASIC WORKING PRINCIPLE Figure 1 depicts the basic structure of the TSMIFTS, consisting of a front common-aperture telescope, dual-interference modules, a medium-wave infrared (MWIR) and long-wave infrared (LWIR) rear imaging system, and a folding mirror to realize a compact structure. Two stepped micro-mirrors with different step heights are used in the two interference channels to generate optical path differences (OPD). The average transmittance of the lenses of the MWIR and LWIR rear imaging systems in the working spectrum is >98.2% and >98%, respectively, enabling the high luminous flux of the system. The back working distance of the common-aperture telescope and the rear imaging system was used to compensate for deviation of the optical system during processing and assembly, and the diffraction MTF was used as the standard for evaluation of the imaging system tolerance. The MTF values for the MWIR and LWIR channels at the characteristic frequency of 17mm/lp have a 90% probability of being greater than 0.55 and 0.48, respectively
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