Abstract
An alternative approach to signal recovery in tunable diode laser spectroscopy with wavelength modulation is proposed and investigated. Measurements of transmission spectra of methane in nitrogen are compared with equivalent data in the HITRAN data base and curve fitting of HITRAN data to that measured have been used to obtain gas concentration and pressure. The results validate the new technique and demonstrate that absolute measurements of rotation / vibration gas line transmission functions, gas concentration and gas pressure can be made accurately without the need for calibration.
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