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Application of sinusoidal phase modulation technique for infrared spectrum measurement by fourier transform method

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Application of sinusoidal phase modulation technique for infrared spectrum measurement by fourier transform method

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A synchronous detection (lock-in amplifier) is then utilized to detect and amplify only one suitable harmonic and removed all other harmonics and noise. Therefore, the SNR of the harmonic is improved significantly. In this paper, a weak infrared emission from a commercial heat-lamp is detected successfully using the proposed system.

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Nội dung Text: Application of sinusoidal phase modulation technique for infrared spectrum measurement by fourier transform method

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