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Sensors 2013, 13(1), 574-586; doi:10.3390/s130100574

Design of an Oximeter Based on LED-LED Configuration and FPGA Technology

Faculty of Electrical Engineering, University of Montenegro, Cetinjski put b.b. Podgorica, 81000, Montenegro
School of Engineering and Built Environment, Glasgow Caledonian University, City Campus 70 Cowcaddens Rd., Glasgow G4 0BA, UK
Author to whom correspondence should be addressed.
Received: 20 November 2012 / Revised: 14 December 2012 / Accepted: 28 December 2012 / Published: 4 January 2013
(This article belongs to the Section Physical Sensors)
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A fully digital photoplethysmographic (PPG) sensor and actuator has been developed. The sensing circuit uses one Light Emitting Diode (LED) for emitting light into human tissue and one LED for detecting the reflectance light from human tissue. A Field Programmable Gate Array (FPGA) is used to control the LEDs and determine the PPG and Blood Oxygen Saturation (SpO2). The configurations with two LEDs and four LEDs are developed for measuring PPG signal and Blood Oxygen Saturation (SpO2). N-LEDs configuration is proposed for multichannel SpO2 measurements. The approach resulted in better spectral sensitivity, increased and adjustable resolution, reduced noise, small size, low cost and low power consumption.
Keywords: photoplethysmography; light emitting diode; sensor; oxygen saturation; FPGA photoplethysmography; light emitting diode; sensor; oxygen saturation; FPGA
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Stojanovic, R.; Karadaglic, D. Design of an Oximeter Based on LED-LED Configuration and FPGA Technology. Sensors 2013, 13, 574-586.

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