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For development of advanced low-cost techniques for health monitoring of biosystem to serve the mankind in holistic manner, extensive research is being carried out across the world to deploy smart materials like piezo sensors those are light weight, portable and less expensive. One such application is the non-bonded piezo sensor (NBPS) configuration based on the electro-mechanical impedance (EMI) technique addressed as bone electro-mechano gram (BEMG) in this paper for the purpose of detecting osteoporotic condition in bones. This technique is proposed to substitute currently available dual energy x-ray absorptiometry (DEXA), which is based on X-rays, whose radiation can cause harmful effects to human being. Using artificial human bones, this paper presents the experimental work done for achieving better mechanical interaction between the BEMG and the bone, resulting in improved efficacy of the configuration. In earlier research work, electrical strain gauges (ESG) and digital multimeter (DMM) were employed to establish maximum tightening and better contact to acquire the repeatability of conductance signatures, whereas in this paper the use of more expedient torque wrench (2.5-11 Nm) based tightening has been demonstrated for effective tightening and attainment of good repeatability of the conductance signature. BEMG is performed on two bones, one representing healthy bone and other the osteoporotic bone, by employing jubilee clamps and torque wrench. A high value of Coefficient of correlation equal to 0.99 is obtained between any two signature in healthy state, thus demonstrating excellent repeatability of signatures. The conductance signatures acquired depict significant difference between healthy and osteoporotic bone conditions. This tightening method was found user friendly, cost effective and eliminating the use of complex electrical equipments.
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