Long-Path THz-TDS Atmospheric Measurements Between Buildings

We have measured THz pulse propagation through a 186 m distance for which the THz pulses propagated in the atmosphere between two buildings separated by 79.3 m, with different relative humidity (RH) and weather conditions such as clouds, rain, and snow. The THz pulses propagated through rain falling at 3.5 mm/h and snow falling at 2 cm/h equivalent to 2.0 mm/h rainfall. For calm weather, the transmitted THz pulseshapes and relative transit times were measured to a precision of 0.1 ps. These broadband measurements demonstrate the potential of line-of-sight THz communications, THz sensing, and THz imaging through fog and smoke.