An (Integrated) Thermal Micrometeoroid Garment (TMG or ITMG) is the outer layer of a space suit. The TMG has three functions: to insulate the suit occupant and prevent heat loss, to shield the occupant from harmful solar radiation, and to protect the astronaut from micrometeoroids and other orbital debris, which could puncture the suit and depressurize it. (This latter function is provided for spacecraft by Micrometeoroid and Orbital Debris (MMOD) Protection systems.[1])
The specific design of TMGs varies between different space agencies and different suits, though they all serve the same purpose.
YouTube Encyclopedic
-
1/5Views:119 2492 53532 57221 1981 833
-
Spacesuits & Extreme Environment Gear
-
Why do space suits cost so much
-
Top 10 Dark NASA Urban Legends The Government Doesn't Want You To Know Are Real
-
NASA APOLLO LUNAR SPACE SUIT DEVELOPMENT & FUNCTIONAL TESTS 1960s FILM XD10014z
-
Spacecraft Multi-Layer Insulaton - MicroCosmos #32
Transcription
A7L suit (Apollo/Skylab)
Outside a Liquid Cooling and Ventilation Garment, pressure bladder, and restraint layer, the TMG for the A7L suit worn on the Moon and during the Skylab Program began with a layer of neoprene-coated nylon ripstop. This was the innermost layer of protection from micrometeoroids. Next, thermal radiation protection was provided by five layers of aluminized PET film (Mylar), alternating with four layers of nonwoven Dacron, which provided thermal spacing, followed by two layers of aluminized polyimide Kapton film and Beta cloth marquisette laminate. The outermost layer of PTFE (Teflon)-coated filament Beta cloth was non-flammable and provided abrasion protection from the notoriously abrasive lunar dust. This layer was supplemented with Teflon abrasion patches at the knees and other areas.[2]
EMU suit (Space Shuttle/ISS)
The construction of the TMG on the EMU suits in use on the Space Shuttle and International Space Station differs somewhat from the construction of the Apollo/Skylab TMG.
The EMU TMG includes seven layers of aluminized Mylar laminated with Dacron, rather than five, and eliminates the use of Kapton. The outermost layer is white Ortho-Fabric, made with a blend of Gore-Tex, Kevlar, and Nomex. This layer can withstand temperatures from −300 to 300 °F (−180 to 150 °C). The outer layer provides both micrometeoroid and thermal protection, by reflecting most of the sun's thermal radiation.
References
- ^ "Micrometeoroid and Orbital Debris (MMOD) Protection" (PDF). NASA. Archived from the original (PDF) on December 26, 2010. Retrieved 2013-05-10.
- ^ Carson, Maurice A.; Rouen, Michael N.; Lutz, Charles C.; McBarron, James W. II. Biomedical Results of Apollo - Section VI - Chapter 6 - Extravehicular Mobility Unit. Lyndon B. Johnson Space Center.
| Launch vehicles | |
|---|---|
| Launch vehicle components | |
| Spacecraft | |
| Spacecraft components | |
| Space suits | |
| Lunar surface equipment |
|
| Ground support | |
| Ceremonial | |
| Related | |
| Flights |     | ||||||
|---|---|---|---|---|---|---|---|
| Astronauts |
| ||||||
| Contingencies |
| ||||||
| People |
| ||||||
| Related | |||||||
This page was last edited on 6 February 2024, at 16:31