Abstract
A radiator is a thermal control device which radiates waste heat from the spacecraft to space and cools equipment. Since an infrared space telescope observes weak infrared signals, it is important to shift thermal radiation wavelength to longer values than the observation signals and to reduce the radiation intensity by cooling the equipment. Especially, the next generation infrared space telescope will be cooled at cryogenic temperatures so as to enhance the observation performance. However, a conventional radiator material, such as black paint, shows lower emissivity at cryogenic temperatures. That is why a new radiator with high emissivity at cryogenic temperatures is required. Therefore, we focused on a structure consisting of periodic array of metallic elements separated from a ground plane by a dielectric spacer layer in order to realize a high emittance radiator at cryogenic temperatures. In this work, we reported the performance of the IR emitter with periodic array. It was designed by the FDTD method. The periodic structure is a circle. The metal layer was made by aluminum and the dielectric layer was made by SiO2. The prototype IR emitters were fabricated. Spectral reflectance of the prototype emitter was measured by FT-IR. Moreover, spectral emittance was measured by the blackbody comparison method, and it was compared with spectral absorptance calculated by spectral reflectance.
| Original language | English |
|---|---|
| Title of host publication | 68th International Astronautical Congress, IAC 2017 |
| Subtitle of host publication | Unlocking Imagination, Fostering Innovation and Strengthening Security |
| Publisher | International Astronautical Federation, IAF |
| Pages | 8213-8220 |
| Number of pages | 8 |
| Volume | 12 |
| ISBN (Print) | 9781510855373 |
| Publication status | Published - 2017 Jan 1 |
| Event | 68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017 - Adelaide, Australia Duration: 2017 Sep 25 → 2017 Sep 29 |
Other
| Other | 68th International Astronautical Congress: Unlocking Imagination, Fostering Innovation and Strengthening Security, IAC 2017 |
|---|---|
| Country | Australia |
| City | Adelaide |
| Period | 17/9/25 → 17/9/29 |
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Keywords
- Cryogenic temperature
- Metamaterial absorber
- Radiator
ASJC Scopus subject areas
- Aerospace Engineering
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
Evaluation of IR emitter with periodic array for spacecraft radiator. / Ohya, Kana; Tachikawa, Sumitaka; Miyachi, Akihira; Sakurai, Atsushi; Nagasaka, Yuji.
68th International Astronautical Congress, IAC 2017: Unlocking Imagination, Fostering Innovation and Strengthening Security. Vol. 12 International Astronautical Federation, IAF, 2017. p. 8213-8220.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Evaluation of IR emitter with periodic array for spacecraft radiator
AU - Ohya, Kana
AU - Tachikawa, Sumitaka
AU - Miyachi, Akihira
AU - Sakurai, Atsushi
AU - Nagasaka, Yuji
PY - 2017/1/1
Y1 - 2017/1/1
N2 - A radiator is a thermal control device which radiates waste heat from the spacecraft to space and cools equipment. Since an infrared space telescope observes weak infrared signals, it is important to shift thermal radiation wavelength to longer values than the observation signals and to reduce the radiation intensity by cooling the equipment. Especially, the next generation infrared space telescope will be cooled at cryogenic temperatures so as to enhance the observation performance. However, a conventional radiator material, such as black paint, shows lower emissivity at cryogenic temperatures. That is why a new radiator with high emissivity at cryogenic temperatures is required. Therefore, we focused on a structure consisting of periodic array of metallic elements separated from a ground plane by a dielectric spacer layer in order to realize a high emittance radiator at cryogenic temperatures. In this work, we reported the performance of the IR emitter with periodic array. It was designed by the FDTD method. The periodic structure is a circle. The metal layer was made by aluminum and the dielectric layer was made by SiO2. The prototype IR emitters were fabricated. Spectral reflectance of the prototype emitter was measured by FT-IR. Moreover, spectral emittance was measured by the blackbody comparison method, and it was compared with spectral absorptance calculated by spectral reflectance.
AB - A radiator is a thermal control device which radiates waste heat from the spacecraft to space and cools equipment. Since an infrared space telescope observes weak infrared signals, it is important to shift thermal radiation wavelength to longer values than the observation signals and to reduce the radiation intensity by cooling the equipment. Especially, the next generation infrared space telescope will be cooled at cryogenic temperatures so as to enhance the observation performance. However, a conventional radiator material, such as black paint, shows lower emissivity at cryogenic temperatures. That is why a new radiator with high emissivity at cryogenic temperatures is required. Therefore, we focused on a structure consisting of periodic array of metallic elements separated from a ground plane by a dielectric spacer layer in order to realize a high emittance radiator at cryogenic temperatures. In this work, we reported the performance of the IR emitter with periodic array. It was designed by the FDTD method. The periodic structure is a circle. The metal layer was made by aluminum and the dielectric layer was made by SiO2. The prototype IR emitters were fabricated. Spectral reflectance of the prototype emitter was measured by FT-IR. Moreover, spectral emittance was measured by the blackbody comparison method, and it was compared with spectral absorptance calculated by spectral reflectance.
KW - Cryogenic temperature
KW - Metamaterial absorber
KW - Radiator
UR - http://www.scopus.com/inward/record.url?scp=85051367259&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051367259&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85051367259
SN - 9781510855373
VL - 12
SP - 8213
EP - 8220
BT - 68th International Astronautical Congress, IAC 2017
PB - International Astronautical Federation, IAF
ER -