Thermal infrared imaging of Mercury - MERTIS - a new remote sensing technology

Arnold, Gabriele; Hiesinger, H.; Helbert, J.; Paproth, Carsten; Säuberlich, Thomas; Peter, G.; Walter, Ingo

doi:10.1117/12.829044

Cited by 10 publications

(18 citation statements)

References 16 publications

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“…The enabling technology that allows sending the first spectrometer for the thermal infrared spectral range to Mercury is an uncooled microbolometer. With this detector, the instrument can be operated in the hot environment of Mercury without the need of a cryogenic cooling system [1].…”

Section: Introductionmentioning

confidence: 99%

“…The MERTIS concept is driven by the need of miniaturization, low power consumption and operation within the thermal and radiation environment at Mercury. The analysis of the composition and the mineralogical mapping of Mercury's surface from the orbit of the planet require high signal-to-noise ratios (SNR) to resolve spectral bands with low contrasts, and an imaging capability of 500 m in spatial resolution for global mapping and better than 500 m for 5-10% of the surface [1]. The optical system shown in figure 1 based on three mirror anastigmat (TMA) with a focal length of 50 mm and an Fnumber of 2 and a modified Offner grating spectrometer.…”

Section: Introductionmentioning

confidence: 99%

“…It has 160 x 120 pixels with a pixel size of 35μm and the useable window area of the bolometer has 100 (spatial) x 80 (spectra) pixels with a spectral channel width of 90 nm per pixel. The position of the 100x80 window area depends on the optical layout and will be defined during instrument (optic's to detector) integration [1]. One of the challenges is the geometrical calibration of the instrument MERTIS and the alignment control of the imaging system mirrors.…”

Section: Introductionmentioning

confidence: 99%

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MERTIS: geometrical calibration of thermal infrared optical system by applying diffractive optical elements

et al. 2015

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Geometrical sensor calibration is essential for space applications based on high accuracy optical measurements, in this case for the thermal infrared push-broom imaging spectrometer MERTIS. The goal is the determination of the interior sensor orientation. A conventional method is to measure the line of sight for a subset of pixels by single pixel illumination with collimated light. To adjust angles, which define the line of sight of a pixel, a manipulator construction is used.A new method for geometrical sensor calibration is using Diffractive Optical Elements (DOE) in connection with laser beam equipment. Diffractive optical elements (DOE) are optical microstructures, which are used to split an incoming laser beam with a dedicated wavelength into a number of beams with well-known propagation directions. As the virtual sources of the diffracted beams are points at infinity, the resulting image is invariant against translation. This particular characteristic allows a complete geometrical sensor calibration with only one taken image avoiding complex adjustment procedures, resulting in a significant reduction of calibration effort.We present a new method for geometrical calibration of a thermal infrared optical system, including an thermal infrared test optics and the MERTIS spectrometer bolometer detector. The fundamentals of this new approach for geometrical infrared optical systems calibration by applying diffractive optical elements and the test equipment are shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MERTIS: geometrical calibration of thermal infrared optical system by applying diffractive optical elements

et al. 2015

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“…During the last twenty years high-resolution (spatial) multispectral imaging systems for photogeologic surface mapping and multi-hyperspectral sensors for thematic mapping have been developed to operate together for planetologic applications on ESA's deep space missions. Planetary spectrometers which were successfully developed, applied and operated on different European planetary projects can be divides into three groups: imaging spectrometers for the 0.25 to 5 µm range 34,35,36,37 , imaging spectrometers in the 7-14 µm region 6,8,9,53 , and interferometers 4,5,41,42,[54][55][56] . Covering the wavelength range from the UV/VIS up to the mid-infrared region, these hyperspectral systems use the reflected sunlight or the thermal emission from the different objects.…”

Section: Introductionmentioning

confidence: 99%

Front Matter: Volume 8153

Butler¹,

Xiong²,

Gu³

2011

SPIE Proceedings

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Section: Introductionmentioning

confidence: 99%

MERTIS: using diffractive optical elements for geometrical calibration

et al. 2010

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Geometrical sensor calibration is essential for space applications based on high accuracy optical measurements, in this case for MERTIS. The goal is the determination of interiour sensor parameters. A conventional method is to measure the line of sight for a subset of pixels by single pixel illumination with collimated light. To adjust angles which define the line of sight of a pixel a manipulator construction is used.A new method for geometrical sensor calibration is presented using Diffractive Optical Elements (DOE) in connection with laser beam equipment. This method is especially used for 2D-sensor array systems but can also be applied to the thermal infrared push-broom imaging spectrometer MERTIS.Diffractive optical elements (DOE) are optical microstructures which are used to split an incoming laser beam with a dedicated wavelength into a number of beams with well-known propagation directions. As the virtual sources of the diffracted beams are points at infinity, the object to be imaged is similar to the starry sky which gives an image invariant against translation. This particular feature allows a complete geometrical sensor calibration with one image avoiding complex adjustment procedures which means a significant reduction of calibration effort.

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Thermal infrared imaging of Mercury - MERTIS - a new remote sensing technology

Cited by 10 publications

References 16 publications

MERTIS: geometrical calibration of thermal infrared optical system by applying diffractive optical elements

MERTIS: geometrical calibration of thermal infrared optical system by applying diffractive optical elements

Front Matter: Volume 8153

MERTIS: using diffractive optical elements for geometrical calibration

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