Terahertz signals and radiation (typically considered from 0.1 to 10.0 THz) may seem beyond the range of practical applications, but such high-frequency energy has many uses for otherwise difficult measurements. For instance, when using the relatively “low” terahertz frequencies from 0.5 to 0.8 THz, terahertz spectroscopy systems can measure water (H2O) vapor temperatures in power plants...
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