Versatile digital lock-in detection technique: application to spectrofluorometry and other fields.
A digital lock-in detection technique which overcomes some practical limitations of the analog lock-in amplifiers is described. An example of implementation is given, based on multichannel pulse analyzers. Some representative results are reported for two typical application fields of lock-in techniques, namely optical spectrometry and semiconductor profiling with C-V techniques. Advantages and limitation of the technique are discussed as well as adaptation to various modulation waveforms.
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Centro di Studio per l'Elettronica Quantistica e la Strumentazione Elettronica del C.N.R., Istituto di Fisica del Politecnico, Milano, Italy.
Longoni
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Freitas
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