| Autor: |
Tran, Dat, Gorius, Nicolas, Quilligan, Gerard T., Gong, Qian, Kolasinski, John R., Purser, Todd C., Siguelnitzky, Ariel, Parker, James E., Wegel, Donald C., Glavin, Daniel P., Gerakines, Perry A., Aslam, Shahid, Nehmetallah, George |
| Zdroj: |
IEEE Sensors Journal; Jul2022, Vol. 22 Issue 13, p12576-12587, 12p |
| Abstrakt: |
A Non-Dispersive Infra-Red (NDIR) gas analyzer has been designed, and a proof-of concept built and validated, to continuously monitor water vapor and carbon dioxide gas partial pressures, for a space-based instrument application, that requires the safe transfer of sublimated volatiles from a comet sample containment system to a gas containment system within the operational pressure-temperature conditions, e.g., water vapor, in the range 3 Torr (268 K) and 30 mTorr (223 K). The NDIR gas analyzer uses quad thermopile detectors integrated with spectral bandpass comprising filters centered at $2.7 ~ \mu \text{m}$ and $6.58 ~ \mu \text{m}$ for water absorption channels, spectral bandpass filter centered at $4.25 ~ \mu \text{m}$ for carbon dioxide absorption channel, and spectral band-pass filter centered at $4.0 ~ \mu \text{m}$ for the reference channel, paired with a pulsed infra-red source. The thermopile detector signals are measured and processed using a custom-built radiation-hard-by-design multi-channel digitizer (MCD) application specific integrated circuit (ASIC). The NDIR gas analyzer can detect water vapor partial pressures up to 3 Torr with a 30 mTorr resolution (1 sigma) and carbon dioxide partial pressures up to 175 Torr with a 50 mTorr resolution (1 sigma) within the temperature range 223–268 K. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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