Infrared and Laser Engineering, Volume. 52, Issue 10, 20230005(2023)
SWIR focal plane array cooled assembly of Tianwen-1 mineralogical spectrometer
Figures & Tables(15)
Fig. 5. Schematic diagram of cold platform with the noise isolation
Fig. 6. Detector noise distribution with 40 ms integration time of noise isolation structure
Fig. 9. The cooldown time curve of IDDCA under different fill pressures
Table 1. The characteristic of IDDCA for the MMS
View tableView in ArticleTable 1. The characteristic of IDDCA for the MMS
Item Characteristics Remarks Detection bands From SWIR to MWIR spectral detection Broad spectrum spectroscopy 1000-3400 nm[ 7 ]Divided into A/B/C bands Band A: 1-1.9 μm； Band B: 1.4-2.7 μm； Band C: 2.1-3.4 μm Low background noise 250e− Typical SNR 150 Operating temperature 80 K/90 K/150 K Three switchable operating temperatures SWaP Small size, low weight (IDDCA ≤ 800 g), low power consumption (stable power ≤ 12 W) Reliability test Thermal cycle test; thermal vacuum test; high temperature storage; low temperature storage; acceleration; 1400 g mechanical shock; sinusoidal and random vibration; open/close loop and life; electromagnetic compatibility (EMC) etc. Full test
Table 2. The main optical parameters of the MMS
View tableView in ArticleTable 2. The main optical parameters of the MMS
Item Specifications Item Specifications Optical F/# (fn) 2.87 Typical wavelength/μm 1.595/1.0/3.4 Unit cells (a1×a1)/μm2 25×25 Grating transmittance (ηg) 0.3173/0.0814/ 0.4418 Spectral resolution (λw)/nm 20 Solar irradiance (L)/W·m−2·μm−1 258.30/751/ 16.59 Surface albedo (Re) 0.15 Lens efficiency (η0) 0.9 Solar altitude angle (Ah) 0.707 Integration time (Tint1)/s 0.02
Table 3. The SWIR detector parameters in the MMS
View tableView in ArticleTable 3. The SWIR detector parameters in the MMS
Item Parameters Test results IDDCA performance Spectral response range/μm 1.0-3.4 Detector response characteristics Non-uniformity 4.8% Quantum efficiency 3.4 μm@50% 1.0 μm@16.5% Rate of blind pixels 0.55% Detector readout mode Non-linearity 0.764% Output saturation voltage/V 2.225 Frame frequency/Hz 60.44 IDDCA SNR 225@1.595 μm
Table 4. Components and their mass at the top of cold finger in Dewar
View tableView in ArticleTable 4. Components and their mass at the top of cold finger in Dewar
Part name Material Density/kg·m−3 Mass/g Cold platform 4J36 8100 6.92 infrared detector MCT 5.76 0.43 Silicon circuit Si 2330 0.39 Substrate Al2O3 4020 0.62 Filter holder 4J29 8350 2.53 Filter Al2O3 4020 1.00 Cold shield Ni/Co 8908 1.29 Total 13.18
Table 6. The specifications of short wave IDDCA
View tableView in ArticleTable 6. The specifications of short wave IDDCA
Main parameters Name Test results Main performance of IDDCA Spectral response range/μm 1.0-3.4 Total weight/g 711.2 Thermal loss 539 mW@80 K Power supply 24VDC & 12 VDC Switchable operating temperatures/K 80/90/150 Temperature stability 0.2 K@30 min Cooldown time 12 min@90 K Temperature accuracy/K 0.3 Detector response characteristics Non-uniformity 4.8% Quantum efficiency 3.4 μm@50% 1.0 μm@16.5% Rate of blind pixels 0.55% Non-linearity 0.764% Detector readout mode Frame frequency/Hz 60.44 SNR 225@1.595 μm
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Zhijiang Zeng, Xue Li, Songmin Zhou, Fulong Zhuang, Guangyu Fan, Zhenyi Hao, Cui Fan, Haimei Gong. SWIR focal plane array cooled assembly of Tianwen-1 mineralogical spectrometer[J]. Infrared and Laser Engineering, 2023, 52(10): 20230005
Paper Information
Category: Infrared technology and application
Received: Jan. 5, 2023
Accepted: --
Published Online: Nov. 21, 2023
The Author Email: Li Xue (lx-sitp@mail.sitp.ac.cn)
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