Infrared and Laser Engineering, Volume. 53, Issue 5, 20230634(2024)
Dewar packaging technology of large-aperture 2 k×2 k infrared detector for cryogenic optics
Figures & Tables(16)
Fig. 5. （a）Cold platform structure A; (b) Detector noise profile of A before chiller works; （c）Detector noise profile of A after chiller works;（d）Cold platform structure B; (e) Detector noise profile of B before chiller works;（f）Detector noise profile of B after chiller works
Table 1. The general technical requirements of IDDCA for the 2 k×2 k
View tableView in ArticleTable 1. The general technical requirements of IDDCA for the 2 k×2 k
Item Characteristics Detection pixel 2048×2048 Operating temperature/K 70 Dewar leaks heat/W <1.1 Weight/kg <1.5 Temperature uniformity/K <0.5 Temperature fluctuation/K <0.5 NETD/mK ≤25
Table 2. Variation of the system MTF of three fields at Nyquist frequency
View tableView in ArticleTable 2. Variation of the system MTF of three fields at Nyquist frequency
MTF at 27.78 lp/mm Axial field of view 0.7 field of view Full field of view Meridian Sagittal Meridian Sagittal Meridian Sagittal Original 0.697772 0.697772 0.701027 0.701027 0.682266 0.682266 Condition 1 0.697767 0.697753 0.701018 0.701014 0.682271 0.682312 Condition 2 0.697121 0.697245 0.700954 0.701034 0.682342 0.682134 Condition 3 0.696956 0.697145 0.700432 0.701165 0.682462 0.681845
Table 3. Variation of wavefront error of primary wavelength based on deformation effect
View tableView in ArticleTable 3. Variation of wavefront error of primary wavelength based on deformation effect
RMS of wavefront error Axial field of view 0.7 field of view Full field of view Without deformation/λ 0.0214 0.0173 0.0137 Condition 1/λ 0.0214 0.0173 0.0141 Condition 2/λ 0.0232 0.0181 0.0134 Condition3/λ 0.0241 0.0185 0.0152
Table 4. Probe temperature fluctuates in 5 min
View tableView in ArticleTable 4. Probe temperature fluctuates in 5 min
Number Detector operating temperature/K Temperature flucuation/K 1 70 0.061 2 70 0.064 3 70 0.077 4 70 0.077 5 70 0.084
Table 5. Properties of bonded materials
View tableView in ArticleTable 5. Properties of bonded materials
Bonded wire material Average thermal conductivity/ W·(m·K)−1 Average resistivity/ ×10−8 Ω·m Tensile strength/ MPa Au 311.42 1.35 180-270 Aluminum-silicon wire 276.29 1.52 160-250 Platinum wire 71.6 10.6 500-800 Platinum-iridium wire (10% iridium) 26.5 22.5 870-1025
Table 6. Test conditions of vibration test
View tableView in ArticleTable 6. Test conditions of vibration test
Sinusoidal vibration in X, Y and Z directions Frequency/Hz 5-11.4 11.4-25 25-80 80-100 Magnitude of vibration 15 mm (O-P) 7.9 g 17.9 g 18 g Stochastic vibration in X, Y and Z directions Frequency/Hz 20-80 80-350 350-2 000 Power spectrum density +3 dB/oct 0.04 g2/Hz −3 dB/oct Acceleration root-mean- square values 6.06 g
Table 7. Main performance indicators
View tableView in ArticleTable 7. Main performance indicators
Item Value Item Value Detector structure 2 k×2 k Inhomogeneity <10% Photosensitive element size/mm 0.018×0.018 Dewar leaks heat/mW 842 Waveband/μm 2.5-5.0 Dewar weight/kg 1.32 Band detection rate/cm·Hz1/2·W−1 Dp*> 5E11 （70 K） Noise equivalent temperature difference/mK <20 Temperature uniformity/K 0.1 （70 K） Temperature fluctuation <0.1
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Haiyong Zhu, Zhijiang Zeng, Wen Sun, Zhenli Zhao, Guangyu Fan, Peng Ji, Qi Zhang, Fulong Zhuang, Xue Li. Dewar packaging technology of large-aperture 2 k×2 k infrared detector for cryogenic optics[J]. Infrared and Laser Engineering, 2024, 53(5): 20230634
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Received: Nov. 13, 2023
Accepted: --
Published Online: Jun. 21, 2024
The Author Email: Zeng Zhijiang (jonzeng@mail.sitp.ac.cn)
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