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Moonwalkers were covered from helmet to boot with lunar dust. Also tagged as the "dirty dozen," astronauts on the various Apollo missions worked long hours in the lunar environment, setting up science equipment and collectively bagged 840 pounds (382 kilograms) of rock and other surface material for shipment back to Earth
Cernan said that "one of the most aggravating, restricting facets of lunar surface exploration is the dust and its adherence to everything no matter what kind ... and its restrictive friction-like action to everything it gets on." The astronaut added: "You have to live with it but you're continually fighting the dust problem both outside and inside the spacecraft."
Originally posted by SarnholeOntarable
Very good concept and presentation.If I was allowed at that rock the helium 3 would be most important
Originally posted by iforget
reply to post by Wrabbit2000
Instead of blowing the dust up and bombing the moon why not find a way to make the dust work for us. How about a friendly rover the sucks the dust up and poops out a handy building block...
There is some evidence that the Moon may have a tenuous atmosphere of moving dust particles constantly leaping up from and falling back to the Moon's surface, giving rise to a "dust atmosphere" that looks static but is composed of dust particles in constant motion. The term "Moon fountain" has been used to describe this effect by analogy with the stream of molecules of water in a fountain following a ballistic trajectory while appearing static due to the constancy of the stream. According to the model recently proposed by Timothy J. Stubbs, Richard R. Vondrak, and William M. Farrell of the Laboratory for Extraterrestrial Physics at NASA's Goddard Space Flight Center, this is caused by electrostatic levitation. On the daylit side of the Moon, solar ultraviolet and X-ray radiation is energetic enough to knock electrons out of atoms and molecules in the lunar soil. Positive charges build up until the tiniest particles of lunar dust (measuring 1 micrometre and smaller) are repelled from the surface and lofted anywhere from metres to kilometres high, with the smallest particles reaching the highest altitudes. Eventually they fall back toward the surface where the process is repeated over and over again. On the night side, the dust is negatively charged by electrons in the solar wind. Indeed, the fountain model suggests that the night side would charge up to higher voltages than the day side, possibly launching dust particles to higher velocities and altitudes. This effect could be further enhanced during the portion of the Moon's orbit where it passes through Earth's magnetotail; see Magnetic field of the Moon for more detail. On the terminator there could be significant horizontal electric fields forming between the day and night areas, resulting in horizontal dust transport - a form of "moon storm".
The majority of acoustic cleaners operate in the audio sonic range from 60 hertz up to 420 Hz. Occasionally there is a requirement to operate in the infrasonic range below 40 Hz. This would apply if there were strict noise control requirements, or there was limited plant access. There are three scientific fields which converge in the understanding of acoustic cleaning technology.
Sound propagation. This relates to an understanding of the nature of the sound waves, how they vary and how they will interact with the environment.
Mathematics of the environment. Materials science, surface friction, distance and areas familiar to a mechanical engineer.
Chemical engineering. The chemical properties of the powder or substance to be debonded. Especially the auto adhesive properties of the powder.
An acoustic cleaner will create a series of very rapid and powerful sound induced pressure fluctuations which are then transmitted into the solid particles of ash, dust, granules or powder. This causes them to move at differing speeds and debond from adjoining particles and the surface that they are adhering to. Once they have been separated then the material will fall off due to gravity or it will be carried away by the process gas or air stream.
The key features which determine whether or not an acoustic cleaner will be effective for any given problem are the particle size range, the moisture content and the density of the particles as well as how these characteristics will change with temperature and time. Typically particles between 20 micrometres and 5 mm with moisture content below 8.5% are ideal. Upper temperature limits are dependent upon the melting point of the particles and acoustic cleaners have been employed at temperatures above 1000 C to remove ash build-up in boiler plants.
It is important to match the operating frequencies to the requirements. Higher frequencies can be directed more accurately whilst lower frequencies will carry further, and are generally used for more demanding requirements. A typical selection of frequencies available would be as follows:
420 Hz for a small acoustic cleaner which might be used to clear bridging at the base of a silo.
350 Hz will be more powerful and this frequency can be used to unblock material build-up in ID (induced draft) fans, filters, cyclones, mixers, dryers and coolers.
230 Hz. At this frequency, the power involved is sufficient to use in most electricity generation applications.
75 Hz and 60 Hz. These are generally the most powerful acoustic cleaners and are often used in large vessels and silos.
Sonic soot blowers offer a cost-effective and non-destructive means of preventing ash and particulate build-up within the power generation industry. They use high energy – low frequency sound waves that provide 360° particulate de-bonding and at a speed in excess of 344 metres per second. Because they employ non-destructive sound waves, unlike steam soot blowers they eliminate any concerns over corrosion, erosion or mechanical damage and do not produce an effluent stream.
An electrostatic precipitator (ESP), or electrostatic air cleaner is a particulate collection device that removes particles from a flowing gas (such as air) using the force of an induced electrostatic charge. Electrostatic precipitators are highly efficient filtration devices that minimally impede the flow of gases through the device, and can easily remove fine particulate matter such as dust and smoke from the air stream. In contrast to wet scrubbers which apply energy directly to the flowing fluid medium, an ESP applies energy only to the particulate matter being collected and therefore is very efficient in its consumption of energy (in the form of electricity).
More to the point what makes you think the dust is thick enough to cause problems in seeing what's on the surface