Publication Type:

Conference Paper


Instrumentation and Measurement Technology Conference, 2006. IMTC 2006. Proceedings of the IEEE (2006)


Acoustic sensors, analog to digital converter, Analog-digital conversion, analogue-digital conversion, arterial blood, Biomedical signal processing, Blood, blood flow, Data acquisition, Data processing, FM modulation, frequency modulation, Frequency response, haemodynamics, Hardware, Infrared detectors, infrared light emitting diodes, Infrared sensors, Instruments, LabVIEW virtual environment, light emitting diodes, Microcomputers, Noninvasive measurement, oxygen saturation, PC audio channel, photo detectors, photodetectors, photoplethysmograph, plethysmography, Pulse measurements, pulse oximeter, Pulse rate, red light emitting diodes, sound card, virtual instrument, virtual instrumentation


<p>This paper presents the design and development of a virtual instrument for the measurement of haemodynamic parameters namely, pulse rate and oxygen saturation in arterial blood based on the popular photoplethysmographic (PPG) principle. A clip-on sensor, housing red and infrared (IR) light emitting diodes and suitable photo detectors is developed. The sensor is interfaced to a PC utilizing the audio channel of the sound card, thus dispensing with expensive analog to digital converter hardware. Since the frequency response of the audio channel is not suitable for the PPG waveforms of red and IR, FM modulation and demodulation are employed. An empirical relationship is developed for the computation of the oxygen saturation in arterial blood using the red and IR PPG data and the well-known and well-established extinction coefficients of haemoglobin with and without oxygen. Data acquisition and processing are accomplished under LabVIEW virtual environment</p>

Cite this Research Publication

A. K. Reddy, J. Bai, R., George, B., Dr. Madhu Mohan N., and V. Kumar, J., “Virtual Instrument for the Measurement of Haemo-dynamic Parameters Using Photoplethysmograph”, in Instrumentation and Measurement Technology Conference, 2006. IMTC 2006. Proceedings of the IEEE, 2006.