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Kasai Lab
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The lab observes the Earth and other planets from space using terahertz waves.
AboutAbout the lab
Observing Earth from space, and space from Earth.
The Kasai Lab uses terahertz waves to observe the Earth from space and to observe planets from the Earth.
In "FROM SPACE," the lab captures greenhouse gases and air pollution from satellites to study changes in the global environment.
In "TO SPACE," the lab explores Jupiter's icy moons, the atmosphere of Mars, and resources on the Moon through terahertz observations.
The lab's work covers everything from developing observation instruments to analyzing data with radiative transfer models and machine learning.
Key terms
- Terahertz waves
- Waves lying between radio waves and light. They are used to remotely determine the types and amounts of molecules in the atmosphere.
- Remote sensing
- A technology for measuring the condition of the ground surface and atmosphere from a distance, using satellites or space probes.
- Radiative transfer
- A calculation that describes how light and radio waves change through absorption and scattering as they travel through the atmosphere.
NewsLab news
View More ↗ResearchResearch themes
By combining the development of terahertz-wave observation instruments, calculations of atmospheric radiative transfer, and data science, the lab works on planetary exploration and Earth observation. Through remote sensing from space, it investigates both changes in the global environment and the nature of the solar system.
*Illustrative imageTSUKIMI: Exploring lunar resources
This mission uses terahertz observations to investigate the distribution of water ice and metal resources in the shallow subsurface of the Moon. Professor Kasai serves as the principal investigator, and the lab works on lunar remote sensing and data analysis.
*Illustrative imageJUICE/SWI: Jupiter's icy moons
This is a submillimeter-wave instrument onboard JUICE (Jupiter Icy Moons Explorer), the European Space Agency's mission to Jupiter's icy moons. It observes the atmosphere of Jupiter and the atmospheres and surfaces of the icy moons, to provide clues about whether they could be habitable.
*Illustrative imageTEREX: Measuring the atmosphere of Mars
This is a very small Mars probe being conceived by the National Institute of Information and Communications Technology (NICT). It will measure water and oxygen in the atmosphere using terahertz spectroscopy, and the lab is estimating the measurement accuracy through simulations.
*Illustrative imageClean Air Index
This is an index for comparing how clean the air is in different regions. The lab compiles air pollution data, with the aim of measuring air quality on a common scale.
MembersFaculty
The members of the Kasai Lab consist of faculty, researchers, administrative staff and secretaries, technical staff, doctoral, master's, and undergraduate students, and research students.As of 2026
- ProfessorYasuko KasaiPublications ↗
- Project Associate ProfessorMarcus Märtens
- Project Associate ProfessorRichard Larsson
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Top of Atmosphere” NASA Earth Observatory / Public domain (cropped)
- TSUKIMI: Exploring lunar resources: “FullMoon2010” Gregory H. Revera / CC BY-SA 3.0 (cropped)
- JUICE/SWI: Jupiter's icy moons: “PIA19048 realistic color Europa mosaic edited” NASA / Jet Propulsion Lab-Caltech / SETI Institute / Public domain (cropped)
- TEREX: Measuring the atmosphere of Mars: “Mars Hubble” NASA and The Hubble Heritage Team (STScI/AURA) / Public domain (cropped)
- Clean Air Index: “AerialViewPhotochemicalSmogMexicoCity 2” Fidel Gonzalez / CC BY-SA 3.0 (cropped)
- Related lab (秋田研究室): “10deg-Mach3-cone-PSUSWT-color-schlieren” Settles1 / CC BY-SA 4.0 (cropped)
- Related lab (因幡研究室): “Schlieren image of supersonic nitrogen flow” Jan Pavelka / CC BY-SA 4.0 (cropped)
- Related lab (野原研究室): “Rosetta Stone” Hans Hillewaert / CC BY-SA 4.0 (cropped)
- Related lab (木内研究室): “Mountains Mekong river and dwellings seen from Mount Phou Si at dusk in Luang Prabang Laos” Basile Morin / CC BY-SA 4.0 (cropped)
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