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We present a gas sensor system based on 245 GHz SiGe transmitter and receiver chips and a carbon molecular sieve gas concentrator. A gas mixture of 100 ppm methanol in ambient air at atmospheric pressure can be detected with high SNR of up to 430 at a pressure of 7.7 Pa after thermal desorption of the gas, which corresponds to a sensitivity of 230 ppb.
This paper describes a spectroscopic system for gas sensing applications. It is based on SiGe transmitters (TXs) and receivers (RXs) operating at frequencies around 245 GHz and 500 GHz. 2f spectra of volatile organic compounds (VOCs) were obtained using wavelength modulation spectroscopy (WMS). Chemometrical analysis of the spectra is performed by applying several multivariate analysis (MVA) techniques.
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