Due to LWIR FPAs is sensitive to ambient temperature, A new coarse and fine compound temperature measure and control method is presented for mK-level measure and control accuracy target of 12.5 um IR FPAs. Coarse measurement and control method is used in non-imaging period, and fine measurement and control method with low-drift precision temperature measurement circuit is used to achieve mK-level measure and control accuracy. Temperature drift model of precision temperature measurement circuit is established, and temperature drift contrast is done between traditional temperature measurement circuit and precision temperature measurement circuit. Experiment results show that the measurement precision of compound temperature measure and control method reaches 3mK and control precision reaches 8mK.
Current analysis was an important research content for reducing power of cryocooler’s controller. Simulation was done among load current, H bridge current and power current refer to 42V bus power voltage. Then relationship among IL1, IC1, ρ and IM1 was established. Simulation results indicate that IL1-max, IL1-ave, IL1-rms, IC1-min and IC1-ave were linearly increasing to ρ and IM1, especially IL1-rms ≈ 0.612ρ IM1-max . IC1-rms increase firstly then decrease with the increasing of ρ. IC1-rms reaches maximum when ρ=0.8, then ICL-rms =(12.32/RM1 + 0.98) exp -((ρ-0.78)/0.57)2. The results were useful for miniaturizing cryocooler’s controller.
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