Digital lock-in algorithm for biomedical spectroscopy and imaging instruments with multiple modulated sources

James M. Masciotti, J. M. Lasker, A. H. Hielscher

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Digital lock-in detection provides spectroscopic and imaging instruments a means of measuring physical quantities with improved signal to noise ratios compared to analogue detection schemes. We introduce a digital lock-in detection algorithm for measuring the amplitude and phase of multiple amplitude modulated signals simultaneously by using particular modulation and sampling constraints and averaging filters. The technique exhibits exceptional reduction in both noise and inter-source distortion. It is shown that the digital lock-in technique can be performed as a simple matrix multiplication in order to reduce computation time. The digital lock-in algorithm is described and analyzed under certain sampling and modulation conditions. Results are shown for experimental data.

    Original languageEnglish (US)
    Title of host publication28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
    Pages3198-3201
    Number of pages4
    DOIs
    StatePublished - 2006
    Event28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06 - New York, NY, United States
    Duration: Aug 30 2006Sep 3 2006

    Publication series

    NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
    ISSN (Print)0589-1019

    Other

    Other28th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS'06
    CountryUnited States
    CityNew York, NY
    Period8/30/069/3/06

    ASJC Scopus subject areas

    • Signal Processing
    • Biomedical Engineering
    • Computer Vision and Pattern Recognition
    • Health Informatics

    Fingerprint Dive into the research topics of 'Digital lock-in algorithm for biomedical spectroscopy and imaging instruments with multiple modulated sources'. Together they form a unique fingerprint.

    Cite this