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The process of using lasers to transform moon dust into roads

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ESA’s PAVER project aimed to create paved surfaces on the lunar surface using melted lunar regolith. They conducted ground-based tests using a carbon dioxide laser and are planning to use a Fresnel lens on the Moon to focus sunlight. The successful use of lasers to melt simulated lunar dust is a significant development in addressing the challenges posed by lunar dust in future missions.

The construction of roads on the lunar surface is essential for astronauts who will likely be driving rather than walking during their missions. Lunar dust is fine, abrasive, and sticky, leading to equipment damage and spacesuit corrosion. For example, the Apollo 17 lunar rover overheated when its rear fender was lost and replaced with a lunar map, covered in kicked-up dust. The Soviet Lunokod 2 rover experienced a similar fate, dying from overheating after its radiator became covered in dust.

To prevent the accumulation of lunar dust, it is necessary to pave active areas on the Moon, including roads and landing pads. The idea of melting sand to create roads was originally proposed in 1933. ESA’s PAVER project, led by Germany’s BAM Institute for Materials Testing in collaboration with Aalen University, LIQUIFER Systems Group, and the University of Claustal in Austria and Germany, investigated the feasibility of building lunar roads using a similar approach. The project received support from the Institute for Space Materials Physics of the German Aerospace Center (DLR).

The PAVER consortium utilized a 12-kilowatt carbon dioxide laser to melt simulated lunar dust and create a glassy solid surface that can serve as a paved surface on the Moon. They achieved spot sizes of 5 to 10 cm in their trials. By utilizing a 4.5 cm diameter laser beam, they developed a strategy to produce a triangular hollow-centered geometry of about 20 cm in diameter. This approach allowed them to create solid surfaces over large areas of lunar soil suitable for roads or landing pads.

The project’s materials engineer, Advenit Makaya, explained that the current laser used in their experiment functions as a light source instead of lunar sunlight. To achieve equivalent melting on the lunar surface, the laser light would be focused using a Fresnel lens with a diameter of several meters.

The PAVER consortium’s methodology involved trial and error to determine the optimal laser beam size and geometry. They found that larger spot sizes were easier to work with, as heating on a millimeter scale produced challenging agglomeration due to surface tension. With their approach, they were able to create a stable layer of molten regolith, which could be better controlled. The resulting material is glassy and brittle but can withstand primarily downward compressive forces, potentially being repaired if needed.

The research team discovered that reheating a cooled track could cause cracks, leading them to minimize crossover in the geometry. The depth of a single melt layer achieved was approximately 1.8 cm. Depending on the required loads, the constructed structures and roads could consist of multiple layers.

The PAVER consortium estimated that a 100 square meter landing pad with a 2 cm thick high-density material could be constructed in 115 days using their approach.

The PAVER project originated from a call for ideas conducted by ESA’s Basic Activities Discovery Division through the Open Space Innovation Platform (OSIP). Out of 69 submissions, 23 ideas were implemented, including the PAVER project. The project has opened up promising avenues for future research in extraterrestrial manufacturing and construction.

Overall, the successful use of lasers to melt lunar dust represents a significant advancement towards the construction of roads and landing pads on the lunar surface, addressing the challenges posed by lunar dust in future lunar missions.

Source: scitechdaily.com

Newly Discovered Light Properties Unveiled by Centuries-Old Theorem

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Researchers have used a 350-year-old mechanical theorem that is usually applied to tangible objects to uncover new insights into the properties of light. By interpreting light intensity as equivalent to physical mass, they mapped light into a system to which established mechanical equations could be applied. This approach reveals a direct correlation between the degree of non-quantum entanglement of light waves and the degree of polarization. These discoveries have the potential to simplify the understanding of complex optical and quantum properties through more direct light intensity measurements.

Researchers at Stevens Institute of Technology have applied a 350-year-old theorem originally used to describe the behavior of pendulums and planets to uncover new properties of light waves.

Ever since Isaac Newton and Christian Huygens debated the nature of light in the 17th century, the scientific community has grappled with the question: Is light a wave, a particle, or both at the same time at the quantum level? . Now, researchers at the Stevens Institute of Technology have used a 350-year-old mechanical theorem, typically used to describe the motion of large physical objects such as pendulums and planets, to A new relationship has been revealed. The most complex behavior of light waves.

Reveal relationships between light properties

The research, led by Xiaofeng Qian, an assistant professor of physics at Stevens College, and reported in the August 17 online issue of Physical Review Research, shows that the degree of non-quantum entanglement of light waves exists in a direct and complementary relationship. We proved for the first time that it does. It depends on the degree of polarization. As one increases, the other decreases, so the level of entanglement can be directly inferred from the level of polarization, and vice versa. This means that difficult-to-measure optical properties such as amplitude, phase, and correlation (and perhaps even properties of quantum wave systems) can be estimated from something much easier to measure: the intensity of light.

Physicists at Stevens Institute of Technology are using a 350-year-old theorem that explains how pendulums and planets work to uncover new properties of light waves. credit:
Stevens Institute of Technology

“We’ve known for more than a century that light sometimes behaves like waves and sometimes like particles, but reconciling these two paradigms is extremely difficult. We know that,” Chen said. There is a deep connection between the concepts of waves and particles not only at the quantum level but also at the level of classical light waves and point-mass systems. ”

Applying Huygens’ mechanical theorem to light

Qian’s team used a mechanical theorem originally developed by Huygens in his 1673 book on pendulums. This theorem explains how the energy required to rotate an object varies depending on the object’s mass and its axis of rotation. “This is a well-established mechanical theorem that explains how physical systems like clocks and prosthetic limbs work,” Qian explained. “But we were able to show that it can also provide new insights into how light works.”

This 350-year-old theorem describes the relationship between a mass and its rotational momentum. So how does this apply to light, which has no mass to measure? Qian’s team interprets the intensity of light as equivalent to the mass of a physical object, which can be interpreted using Huygens’ mechanical theorem. We mapped those measurements into a coordinate system. “Essentially, we found a way to transform optical systems so that they can be visualized as mechanical systems and described using established physical equations,” he explained. .

Once the researchers visualized light waves as part of a mechanical system, new relationships between wave properties quickly became apparent, such as the fact that entanglement and polarization are clearly related to each other.

“This hasn’t been shown before, but when you map the properties of light onto a mechanical system, it becomes very clear,” Qian says. “What was once abstract becomes concrete. Using mechanical equations, you can literally measure the distance between the ‘center of mass’ and other mechanical points to determine how different properties of light interact with each other. We can show how they are related.”

Elucidating these relationships has important practical implications, as it may allow us to estimate subtle and difficult-to-measure properties of optical systems, and even quantum systems, from simpler and more reliable measurements of light intensity. Qian explained that there is a gender. More speculatively, the researchers’ findings suggest that mechanical systems could be used to simulate and better understand the strange and complex behavior of quantum wave systems.

“It’s still in front of us, but this first study clearly shows that by applying mechanical concepts, we can understand optical systems in entirely new ways,” Qian said. Ta. “Ultimately, this research will help simplify the way we understand the world by allowing us to recognize the essential underlying connections between seemingly unrelated physical laws.”

References: “Bridging coherence optics and classical mechanics: Complementarity of general light polarization entanglement” by Xiao-Feng Qian and Misag Izadi, August 17, 2023. physical review study.
DOI: 10.1103/PhysRevResearch.5.033110

Source: scitechdaily.com