Lesson 1 2010 transducers with activities

Lesson 1 2010 transducers with activities -...

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1 Medical Transducers Lesson 1
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2 Medical Transducers Objective: After learning this section, you will be able to: Explain the operation of a bioelectrode; Compute the impedance of an electric model of a bioelectrode; Explain the operation of a thermistor; Compute the output voltage of a Wheatstone bridge circuit;
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3 Medical Transducers Objective: After learning this section, you will be able to: Explain the operation of a strain gage transducer and define the gage factor; Explain the operation of capacitive pressure transducers.
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4 Bioelectrodes Transducer: device that converts some form of energy produced by a physical stimulus into electric analog of the stimulus Several sources of voltage and current in the body associated with biologic functions Bioelectric current: movement of ions (ionic conduction) Bioelectrode: transducer that converts ionic conduction into electronic conduction Bioelectrode for measurement of ECG, EEG,. ..
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5 Electrode Half-cell Potential Electrode: metal + electrolyte (metal salt or biologic fluid) Local change in ion concentration near metal surface Half-cell potential: Potential difference between metal and bulk electrolyte Ag Ag + e - + Reduction Electrolyte (AgCl) M e t a l ( A g ) Oxidation
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Measurement of Half-Cell Potential Half-cell potential measured relative to hydrogen- hydrogen ion (H-H) electrode (0V)
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Lesson 1 2010 transducers with activities -...

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