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Application of Transducers in Biomedical Instrumentation

Application of Piezoelectric Transducer

Application of Thermoresistive Transducer

In metals and semiconductors, the value of resistance changes constantly. This change in resistance is the basis for all Thermoresistive temperature sensors. Temperature coefficient relates temperature and resistance. In positive type, resistance raises with temperature and in negative type resistance decreases with increase in temperature. In metals, temperature coefficient is positive and in semiconductors, temperature coefficient is negative.

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Application of Transducers in Biomedical Instrumentation

Application of Photoelectric Transducers

Photoemissive Tube

A photoemissive tube consists of a gas-filled tube with two electrodes, one cathode, and another anode. Cathode acts as one electrode, and it has a specially coated material around it. When light falls on the cathode, it releases electrons. The release in electron produces a current, which is proportional to the light intensity. Usually, antimony, silver, bismuth is employed as coating materials.

Photovoltaic Cell

A photovoltaic cell has an outer layer of selenium, coated with a transparent metal film. The metal film and selenium layer are insulated from each other, and this forms the barrier layer. Light with high intensity illuminates the barrier layer. As the light falls on it, it releases electrons, which causes a potential difference in the barrier layer. After the occurrence of potential difference, the metal film turns into positive, and selenium layer turns into negative. This is an example for the active transducer.

Applications

ear-lobe oxymetry I am M.Vidya, currently employed as Assistant Professor, Department of Instrumentation and Control Engineering, Coimbatore Tamilnadu,. I have completed my B.Tech Electronics and Instrumentation. M.Tech in Biomedical Engineering. I am passionate about Teaching and Research in the field of Biomedical Instrumentation and Biomedical Imaging. You can contact me at [email protected] for any technical queries.


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