Lecture 3

Question 1

Converts energy from one form to another

Answer 1

transducer

Question 2

Converts physical parameter to electrical output

Answer 2

sensor

Question 3

Interested in converting three physiological events to electrical signals

Answer 3

chemical, thermal, mechanical

Question 4

advantage of electrical signal:

Answer 4

facilitates storage and subsequent data processing

Question 5

Refers to the ability of a transducer to produce an output signal that is directly proportional to the input amplitude

Answer 5

Amplitude linearity

Question 6

measures the ability of the transducer to produce an output that follows the input independently of a direction change of input

Answer 6

Hysteresis

Question 7

Apply physiologic event of known amplitude

Answer 7

calibration

Question 8

sensor is precalibrated at factory

Answer 8

standization

Question 9

Resistive Sensors: resistance depends on:

Answer 9

material properties, geometric configuration, and temperature

Question 10

Change in resistance is converted to:

Answer 10

Change in voltage

Question 11

Resistance changes with change in______ with strain gauges.

Answer 11

geometry

Question 12

Resistive element is cemented onto a packing approx. the size of postage stamp. The backing is then cemented onto the structure to be deformed.

Answer 12

bonded strain gauge

Question 13

resistance wire is stretched between supporting members

Answer 13

unbounded

Question 14

R = (Formula)

Answer 14

pL/A

Question 15

strain=(Formula)

Answer 15

(L-L0)/L0

Question 16

true strain=(formula)

Answer 16

ln(L/L0)

Question 17

Actual displacement in a strain gauge is dependent on the ______of the gauge wire

Answer 17

material properties

Question 18

Maximum strain=(formula)

Answer 18

f/E

Question 19

Change in R/ R =

Answer 19

Gf/E or G*dL/L

Question 20

Strain gauges output varies as a function of:

Answer 20

temperature

Question 21

generally use strain gauges in ____ in a bridge circuit

Answer 21

in pairs

Question 22

the second gauge in a wheatstone is subjected to ______ variation but not _______

Answer 22

temperature; strain

Question 23

A wheatstone bridge minimizes ______ and increases______

Answer 23

thermal effects; output(4x)