Semmlow+Bioinstrumentation+Spec+Topics+091710

Semmlow+Bioinstrumentation+Spec+Topics+091710 - 0*...

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* * Bioinstrumentation John L. Semmlow, Ph.D. Professor of Biomedical Engineering, Rutgers University Professor of Surgery, Robert Wood Johnson Medical School
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* * Typical Bioengineering Measurement System Biosignal Electrical signal Electrical signal Digital signal
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* * Biosignals What is a signal? Signals are variations in energy that carry information . The variable that carries the information (the specific energy fluctuation) depends upon the type of energy involved. For example, if the energy is electrical, the variable is a voltage or a current, while if the energy is mechanical, the variable is force or velocity (or position). What do we use signals for? Irrespective of the type of system, its scale, or its function, we must have some way of interacting with any system of interest to us. Interaction or communication with a system or between systems is done through signals.
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* * Biosignals - Biotransducers To obtain a signal from a physiological or biological system requires an interface between the system and our instruments. Such an interface is usually termed a “ biotransducer ” a specialized form of transducer. The biotransducer often is the limiting component in a bioinstrumentation system. Measurement (image) sensitivity and resolution are often determined by the biotransducer. Safety concerns also center around the biotransducer.
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* * Transducers A “ transducer ” is a device that converts energy from one form to another. The purpose of is energy conversion in biotransducers is to transfer information , not to do work. Biotransducers are so-called input transducers : they convert non-electrical energy into an electronic signal. Electric signal V ( t ) Physiological Energy Biotransducer
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* * Biotransducers Input transducers convert signals from other energy modalities (mechanical, chemical, thermal, even other types of electrical) into electrical signals.
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This note was uploaded on 10/11/2011 for the course BIOMEDICAL 201 taught by Professor Berth during the Fall '10 term at Rutgers.

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Semmlow+Bioinstrumentation+Spec+Topics+091710 - 0*...

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