High-Temp Electronics For Venus Exploration, recent advances |
High-Temp Electronics For Venus Exploration, recent advances |
Mar 13 2013, 03:36 PM
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Member Group: Members Posts: 127 Joined: 20-April 05 Member No.: 291 |
(MOD NOTE: Started a new topic for this discussion to continue. Please remember the 'no sci-fi engineering' provision of rule 1.9. Have fun!)
Also, since I'm thinking about surface operations on Venus, the state-of-the-art in high temperature electronics has advanced quite far in the past decade. Its now possible to buy off the shelf chips from vendors designed to operate at the 250-300 C range. Meanwhile basic functionality has been tested at and beyond the temperatures needed for long-term surface operations on Venus: http://www.grc.nasa.gov/WWW/SiC/ http://www.gizmag.com/extreme-silicon-carb...ctronics/16410/ http://www.grc.nasa.gov/WWW/SiC/publicatio...Contact2010.pdf Another decade or so and a long-term Venus lander could be possible with (practically) off the shelf electronics! |
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Apr 9 2013, 02:44 AM
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
For instance, the longer the camera lasts, the longer the focal length you can have on the camera (assuming a scan platform or a moving mirror of some kind).
The idea being, you have more time for more pictures, so a longer focal length gets you higher resolutions further from the probe. You'd want the time available (indefinite would be GREAT!) and the data rate available for the camera system to be utilized in sending as many pixels as possible of the area the probe lands in. Probably too much to hope for that the probe could analyze the pictures and aim for 'interesting' rocks or hills/mountains in the distance. So the probe should attempt to mosaic the entire area. (maybe a simple filter might be possible, even analog techniques might be useful. For instance, a photo of sharp angular details will have more high frequencies in an analog readout of the camera than will a photo of an area with rounded/soft forms. Presumably the sharp angles pictures would be more interesting) Also should factor in transmission efficiency of the atmosphere, a hazy or dusty area (assuming areas on Venus vary in these details) would limit how much detail could be recorded at a distance. Colorimetry will be a little different. We already know from the color filters used in the Soviet era that there is essentially no blue or violet light at the surface. Color analysis will be confined to red thru ~green. Also, viewing the surface in IR will be hindered at wavelengths corresponding to the ambient temperature, an IR camera won't record much detail in that band, nor at longer wavelengths. I don't know about polarized IR, maybe somebody knows if that has any practicality in this tough environment? |
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