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We have improved the ac-dc transfer differences and enhanced the sensitivity in our thin-film multijunction thermal converters (TFMJTCs) in vacuum. The ac-dc transfer differences of the TFMJTCs are less than 1 $\mu $ V/V down to 1 Hz and 10 $\mu $ V/V down to 0.2 Hz owing to the increased thermal time constant. The measured output voltage exceeds 120 mV at $10^{\mathrm {-4}}$ Pa owing to the reduction...
We have evaluated the AC-DC transfer differences of our thin-film multijunction thermal converters with increased heat capacity under vacuum conditions to improve the low frequency characteristics. µµ The measured thermal time constant at about 0.001 Pa is increased up to 9 s from 3 s measured at ambient pressure. The AC-DC transfer differences evaluated by using a sampling method are less than 1...
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