| || Piezoelectric Sensor for Human Pulse Detection
Author : Kalange, A. E.;Gangal, S. A.
Source : Defence Science Journal ; Vol:57(1) ; 2007 ; pp 109-114
Subject : 66 Chemical Technology
Keywords : Human pulse;Nadi pariksha;Piezoelectric sensor;Doshas;Vata;Kapha;Pitta;Piezoresistive sensors;Human pulse detection
Abstract : Diagnosis according to Ayurveda is to find the root cause of a disease. Out of eight different kinds of examinations, nadi-pariksha is very important. By checking the pulse, the Ayurvedic physician finds the predominant dosha out of the three - vata, pitta and kapha. Nadi-pariksha is done at the root of the thumb by examining the radial artery. Presently, this technique is subjective and the accuracy of the diagnosis depends upon the expertise of the Ayurvedic physician. As a first step towards making the diagnosis by nadi-pariksha objective, human pulse detection and processing system has been developed. Piezoelectric sensor was used for human pulse detection. The pulse signals obtained from the piezoelectric sensor were processed through signal processing circuitry. The signal provessing circuit consists of signal amplifier, filters, and noise-reduction circuit. The signal processing circuit has been designed, built, and tested. The performance of the developed system was evaluated by recording the pulses of people (subject) having different doshas. Pulse shapes, repetition rate, amplitude were found to be different for people having different doshas. Performance of the signal processing circuit and the pulse waveforms obtained have been presented and analysed.