Solid state sensors for biomedical instruments

The output of transducers which are used in physiological measuring is observed to be nonlinear. This nonlinear characteristic of transducers fails to measure the actual value of physiological parameter like temperature, pulse rate, heart beats, etc. the researcher has developed the body temperature measuring transducer using time base oscillating circuit and thermister as temperature sensing element. The time base circuit, phototransistor and LED are used for designing quick recovery heart beat sensor. The design technique of these transducers, their characteristics and comparisons with existing sensors in similar kind of biomedical instruments is discussed in this paper.