Title :
Low-Cost DSP System Design for a Handheld Biomarker Detection Device
Author :
Kelley, R. ; Meier, J. ; Snyder, A. ; Yeary, M. ; Spring, J. ; Arul, A. ; Hicks, T. ; McCann, P. ; Roller, C.
Author_Institution :
School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK
Abstract :
This paper discusses a low-cost, compact, digital signal processor (DSP)-based fluorescence spectroscopy measurement device which can be used to characterize fluorescent materials. Using a precision-pulsed UV emitter and a high-speed photo-multiplier tube, a sub-nanosecond signal is generated which contains fluorescence decay information. To uniquely identify a substance, this signal must be effectively sampled at speeds in the neighborhood of 10 GHz or more. To accomplish this, a novel swept delay design using a distributed successive approximation routine was implemented on a Texas Instruments DSP. This DSP coupled with other supporting hardware comprise this undersampling digitizer, which was successfully used to measure the lifetime of several material specimens at a 10 GHz sampling rate. These results are presented in this paper.
Keywords :
fluorescence spectroscopy; high-speed undersampling; swept delay; ultraviolet biodetection;
Conference_Titel :
Signal Processing Applications for Public Security and Forensics, 2007. SAFE '07. IEEE Workshop on
Conference_Location :
Washington, DC, USA
Print_ISBN :
1-4244-1226-9
