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  • Title: [Experimental study on harmonic detection of methane by use of a digital lock-in amplifier].
    Author: Dong L, MA WG, Yin WB, Li CY, Jia ST.
    Journal: Guang Pu Xue Yu Guang Pu Fen Xi; 2005 Mar; 25(3):473-6. PubMed ID: 16013337.
    Abstract:
    The harmonic detection of methane at 6105.3694 cm(-1) was measured by use of a digital lock-in amplifier (SR830) remotely controlled by a computer. The programme was written by Visual Basic 6.0 because it has strong function and a friendly appearance. The experimental results are in agreement with theoretical analysis, which fully confirms that a better signal-to-noise ratio (SNR) can be achieved in the high-harmonics detection of trace gases by the digital lock-in amplifier. The method can be applicable to the highly sensitive detection of pollution gases.
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