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A frequency-selective absorbance detection approach and its applications are described. First, a digital signal processor–lock-in amplifier (DSP–LIA)-based absorbance detector was evaluated. Compared to a simple operational amplifier (TL082CP)-based detector, the DSP–LIA-based detector showed lower noise levels, but the relative advantage was reduced under very low photocurrent levels (down to few...
Light emitting diodes (LEDs) were first used for chemical analysis three decades ago. They are finally making their appearance in commercial analytical systems and dedicated detectors. LEDs are the most energy-efficient means of producing monochromatic light, and provide a concentrated small cool emitter ideal for miniature analytical devices. Although they rank behind fluorescent and halogen discharge...
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