Dual-telescope multi-channel thermal-infrared radiometer for outer planet fly-by missions

Aslam, Shahid; Amato, M.; Bowles, Neil E.; Calcutt, S. B.; Hewagama, T.; Howard, Joseph M.; Howett, C. J. A.; Hsieh, Wen‐Ting; Hurford, T. A.; Hurley, J.; Irwin, Patrick; Jennings, Donald E.; Kessler, E.; Lakew, B.; Loeffler, M. J.; Mellon, M. T.; Nicoletti, Anthony; Nixon, C. A.; Putzig, N. E.; Quilligan, G.; Rathbun, J. A.; Segura, M.; Spencer, J. R.; Spitale, J. N.; West, Garrett

doi:10.1016/j.actaastro.2016.08.009

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…Effective 20-bit digitization of the signals can be attained by using the analog front-end gain and oversampling ratio. The original design targeted a proposed Europa Clipper thermal instrument (Aslam et al, 2016) readout for operation in the harsh Jovian orbital environment, i.e., immunity to > 3 Mrad (Si) total ionizing dose (TID). The MCD ASIC also has a multiplexed buffered SD ADC for general purpose (housekeeping) tasks, 10 DACs, a serial port and a die temperature sensor.…”

Section: Asic Readoutmentioning

confidence: 99%

Advanced Net Flux Radiometer for the Ice Giants

et al. 2020

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The design of an advanced Net Flux Radiometer (NFR), for inclusion as a payload on a future Ice Giants Probe mission, is given. The Ice Giants NFR (IG-NFR) will measure the upward and downward radiation flux (hence net radiation flux), in seven spectral bands, spanning the range from solar to far infra-red wavelengths, each with a 5° Field-Of-View (FOV) and in five sequential view angles (±80°, ±45°, and 0°) as a function of altitude. IG-NFR measurements within either Uranus or Neptune's atmospheres, using dedicated spectral filter bands will help derive radiative heating and cooling profiles, and will significantly contribute to our understanding of the planet's atmospheric heat balance and structure, tropospheric 3-D flow, and compositions and opacities of the cloud layers. The IG-NFR uses an array of non-imaging Winston cones integrated to a matched thermopile detector Focal Plane Assembly (FPA), with individual bandpass filters, housed in a diamond windowed vacuum micro-vessel. The FPA thermopile detector signals are read out in parallel mode, amplified and processed by a multi-channel digitizer application specific integrated circuit (MCD ASIC) under field programmable gate array (FPGA) control. The vacuum micro-vessel rotates providing chopping between FOV's of upward and downward radiation fluxes. This unique design allows for small net flux measurements in the presence of large ambient fluxes and rapidly changing ambient temperatures during the Probe descent to ≥10 bar pressure.

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Section: Asic Readoutmentioning

confidence: 99%

Advanced Net Flux Radiometer for the Ice Giants

et al. 2020

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“…Custom designed state-of-the-art uncooled thermopiles have flown on several space flight instruments including the Mariner, 24 Voyager, 25 Cassini, 26 LRO, 27 MRO 28 and BepiColombo missions, 29 and are in consideration for future space-flight mission concepts. 30,31 They are also commercially available from several vendors. [32][33][34][35][36] The state-of-the-art in thermopile linear arrays has demonstrated pixel sizes ∼70-500 microns, and specific detectivity D * ∼3×10 8 -2×10 9 cm √ Hz/W for respective time constants, τ ∼2-300 ms (see Table 1).…”

Section: Potential Detector Performance and Comparisonmentioning

confidence: 99%

Uncooled doped-Si thermopiles for thermal land imaging applications

Barrentine

Brown

Kotecki

et al. 2019

Image Sensing Technologies: Materials, Devices, Systems, and Applications VI

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Sustained and enhanced land imaging is crucial for providing high-quality science data on change in land use, forest health, environment, and climate. Future thermal land imaging instruments operating in the 10-12 micron band will provide essential information for furthering our hydrologic understanding at scales of human influence, and producing field-scale moisture information through accurate retrievals of evapotranspiration (ET). To address the need for cost-effective future thermal land imaging missions we are developing novel uncooled dopedsilicon thermopile detectors, an extension of a detector design concept originally developed at NASA-Goddard for planetary science applications. These doped-Si thermopile detectors have the potential to offer superior performance in terms of sensitivity, speed, and customization, when compared to current commercial-off-the-shelf uncooled detector technologies. Because cryocooler technology does not need to be fielded on the instrument, these and other uncooled detectors offer the benefit of greatly reduced instrument cost, mass, and power at the expense of some acceptable loss in detector sensitivity. We present the motivation for an uncooled thermal imaging instrument, our doped-Si thermopile detector concept, and performance expectations and comparisons. We also provide an update on the current status of this detector technology development.

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“…NASA Goddard Space Flight Center is currently working on several space based thermal radiometer concepts (e.g., [1,2]). One of these concepts is the Ice-Giants Net-flux Radiometer (IG-NFR) being developed for a future Uranus or Neptune probe mission [3].…”

Section: Introductionmentioning

confidence: 99%

Parallel Computation of CRC-Code on an FPGA Platform for High Data Throughput

et al. 2021

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With the rapid advancement of radiation hard imaging technology, space-based remote sensing instruments are becoming not only more sophisticated but are also generating substantially more amounts of data for rapid processing. For applications that rely on data transmitted from a planetary probe to a relay spacecraft to Earth, alteration or discontinuity in data over a long transmission distance is likely to happen. Cyclic Redundancy Check (CRC) is one of the most well-known package error check techniques in sensor networks for critical applications. However, serial CRC computation could be a bottleneck of the throughput in such systems. In this work, we design, implement, and validate an efficient hybrid look-up-table and matrix transformation algorithm for high throughput parallel computational unit to speed-up the process of CRC computation using both CPU and Field Programmable Gate Array (FPGA) with comparison of both methods.

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Dual-telescope multi-channel thermal-infrared radiometer for outer planet fly-by missions

Cited by 7 publications

References 34 publications

Advanced Net Flux Radiometer for the Ice Giants

Advanced Net Flux Radiometer for the Ice Giants

Uncooled doped-Si thermopiles for thermal land imaging applications

Parallel Computation of CRC-Code on an FPGA Platform for High Data Throughput

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