Sensors

Question 1

Transducer

Answer 1

device that converts energy from one form to another

Question 2

Sensor

Answer 2

converts a physical parameter to an electrical output

measure variations such as: resistance, inductance, capacitance, piezo electric effect, electromagnetic radiation

Question 3

Actuator

Answer 3

converts an electrical signal to a physical output

Question 4

How could we measure displacement?

Answer 4

size, shape, position
change in diameter of vessels
changes in volume or shape of cardiac chambers
movement of liquids in valves

Question 5

What are two types of RESISTIVE displacement sensors?

Answer 5

Potentiometers & Strain Gauges

Question 6

Potentiometers

Answer 6

a type of resistive displacement sensor

produce a linear output as a function of displacement

ex: minitorque potentiometers for eye blink measurements after brain damage

Question 7

Strain Gauges

Answer 7

uses a thin wire to stretch and measure corresponding resistive changes based on the length, diameter, and resistivity

Question 8

What are the two types of bonds for strain gauges?

Answer 8

bonded: wire is embedded in cloth or plastic, and mounted onto a flexible plate