Medical Transducers Flashcards
What is the primary function of medical transducers?
Medical transducers are used to convert physiological variables into electrical signals.
What are deflection type transducers?
Deflection type transducers are attached to a thin, flexible diaphragm made of materials like stainless steel or phosphor bronze. Mechanical deflection due to force or pressure changes an electrical parameter such as resistance, capacitance, or inductance.
What is the formula for resistance in Resistance Transducers?
R = Resistivity × length / area
What is the formula for capacitance in Capacitance Transducers?
C = Permittivity × area / plate separation
What are the key characteristics of capacitance transducers?
Capacitance transducers have a high speed of response and high sensitivity.
What is the principle of Inductance Transducer – LVDT?
A differential transformer consists of a primary winding and two secondary windings around an inductive core. Applied force or pressure changes the core position, resulting in a proportional secondary output voltage.
How do piezoelectric transducers work?
Ultrasound can be generated and detected by piezoelectric transducers. A piezoelectric crystal vibrates at its resonant frequency when a voltage pulse is applied and produces a voltage when subjected to mechanical stress.
Draw a diagram of LVDT (Linear Variable Differential Transformer)
