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HyTES Instrument

HyTES: A Hyperspectral Thermal Emission Spectrometer for HyspIRI-TIR Science

The objective of this work carried out at JPL is to build and deploy an airborne Hyperspectral Thermal Emission Spectrometer (HyTES) with 512 pixels across track with pixel sizes in the range of 5 to 50 m depending on aircraft flying height and 256 spectral channels between 7.5 and 12 µm. The HyTES design is built upon a Quantum Well Infrared Photodetector (QWIP) focal plane array (FPA) , a cryo-cooled Dyson Spectrometer and a high-efficiency, concave blazed grating, produced using E-beam lithography.

HyTES will be useful for a number of applications, including high-resolution surface temperature and emissivity measurements and volcano observations. HyTES measurements will also be used to help determine scientifically optimal band locations for the thermal infrared (TIR) instrument for the Decadal HyspIRI mission.


Comparison of the spectra of SO2, silicate ash, and SO4 aerosols at the spectral resolution of HyTES and MASTER. These simulated spectra are distinct at the resolution of MASTER or HyTES. Due to similarities in these spectra, unique estimates of the proportions of these materials in heterogeneous plumes would require HyTES-class resolution.


Spectral range
7.5 - 12 mm
Spectral channels (sampling)
256 (17.6 nm)
Field of view
IFOV (pixel subtense)
1.44 mrad
Spatial elements
Pixel size at 2000 m flight altitude
3.64 m
Slit width
39 mm


Instrument Type: 
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