Bioelectric Signal Measuring System

7th International Congress of Engineering Physics

物理学;工业技术

Guadarrama-Santana, A.^1 ; Pólo-Parada, L.^2 ; García-Valenzuela, A.^1

Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de, Mexico Ciudad Universitaria, Apartado Postal 70-186, México, Distrito Federal

04510, Mexico^1

Department of Medical Pharmacology and Physiology, University of Missouri, John M. Dalton Cardiovascular Research Center, 134 Research Park Drive, Columbia

MO

65211, United States^2

关键词: Bioelectric signals;    Bioelectrical signals;    Differential voltage;    Excitation voltage;    Inter-digitated electrodes;    Material under tests;    Measuring systems;    Parasitic capacitance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/582/1/012017/pdf
DOI  :  10.1088/1742-6596/582/1/012017

学科分类：工业工程学

来源: IOP

【 摘 要 】

We describe a low noise measuring system based on interdigitated electrodes for sensing bioelectrical signals. The system registers differential voltage measurements in order of microvolts. The base noise during measurements was in nanovolts and thus, the sensing signals presented a very good signal to noise ratio. An excitation voltage of 1Vrmswith 10 KHz frequency was applied to an interdigitated capacitive sensor without a material under test and to a mirror device simultaneously. The output signals of both devices was then subtracted in order to obtain an initial reference value near cero volts and reduce parasitic capacitances due to the electronics, wiring and system hardware as well. The response of the measuring system was characterized by monitoring temporal bioelectrical signals in real time of biological materials such as embryo chicken heart cells and bovine suprarenal gland cells.