A Bakman Technologies PB7220-2000-T frequency-domain THz spectrometer is modified to allow it to operate autonomously while attached to a DJI-S1000 consumer drone. The THz spectrum of atmospheric water vapor is recorded during an 8 min flight 10 m above the ground at Paramount Ranch Park, Agoura Hills, CA, USA. The spectrum is then compared to theory and the relative humidity determined.
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Demers et al. (2017) studied this question.
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