Lecture 3 Flashcards

1
Q

Converts energy from one form to another

A

transducer

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2
Q

Converts physical parameter to electrical output

A

sensor

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3
Q

Interested in converting three physiological events to electrical signals

A

chemical, thermal, mechanical

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4
Q

advantage of electrical signal:

A

facilitates storage and subsequent data processing

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5
Q

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

A

Amplitude linearity

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6
Q

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

A

Hysteresis

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7
Q

Apply physiologic event of known amplitude

A

calibration

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8
Q

sensor is precalibrated at factory

A

standization

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9
Q

Resistive Sensors: resistance depends on:

A

material properties, geometric configuration, and temperature

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10
Q

Change in resistance is converted to:

A

Change in voltage

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11
Q

Resistance changes with change in______ with strain gauges.

A

geometry

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12
Q

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

A

bonded strain gauge

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13
Q

resistance wire is stretched between supporting members

A

unbounded

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14
Q

R = (Formula)

A

pL/A

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15
Q

strain=(Formula)

A

(L-L0)/L0

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16
Q

true strain=(formula)

A

ln(L/L0)

17
Q

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

A

material properties

18
Q

Maximum strain=(formula)

A

f/E

19
Q

Change in R/ R =

A

Gf/E or G*dL/L

20
Q

Strain gauges output varies as a function of:

A

temperature

21
Q

generally use strain gauges in ____ in a bridge circuit

A

in pairs

22
Q

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

A

temperature; strain

23
Q

A wheatstone bridge minimizes ______ and increases______

A

thermal effects; output(4x)