Abstract
Arterial pulse signal reading by a therapist in Traditional Chinese Medicine (TCM) requires considerable experience and thoroughness. The interpretation resulted by the therapist is very subjective. The objectivity of the device can be achieved by increasing the accuracy and the consistency of the reading in the range of 1-2 Hz. An electret condenser microphone (ECM) can be used as a pulse sensor in such device. This study reveals that ECM performs a number of advantages such as small-sized and inexpensive. Unfortunately, this ECM also picks up mechanical noises during direct contact with the subject. This study proposed soft silicon rubber as a medium between subjects and ECM. The technique was designed to enhance the mechanical coupling between the ECM and the source signal without affecting the signal source. The results show that the ECM could measure the signal of 0.5-10 Hz with the average accuracy of 99,47%.
Highlights
Arterial pulse readings by a therapist in Traditional Chinese Medicine requires years of experience to produce an accurate diagnosis
To be able to know the characteristics and responses of the microphone, the authors tested the system using a sound source with a constant amplitude and a varying frequency that has a range of 0-10 Hz
Even at very low frequency the error is still very small. This opens a possibility of constructing a signal processing which can partially amplify the lower frequency part i.e., 0.5 – 2 Hz to achieve the goal of using the electret condenser microphone (ECM) as the pulse sensor
Summary
Arterial pulse readings by a therapist in Traditional Chinese Medicine requires years of experience to produce an accurate diagnosis. Many efforts have been made to make a diagnostic instrument functioning similar procedure in the absence of a professional therapist. The most important part of the instrument is the pulse sensor. Researchers around the world have been proposed different kinds of sensor to detect the pulse such as piezoelectric devices [1], strain gauges [2], [3], condenser microphones [4], etc. A strain gauge model 318 L SS model 86 as a heartbeat sensor. The sensor was used to capture the signal with the frequency range 0.26 - 1.51 Hz [5]. The strain gauge study was focused on signal processing analysis using FFT technique [6]
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