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EPHE 341 > Sensors and data acquisition > Flashcards

Sensors and data acquisition Flashcards

1
Q

a device that measures a physical quantity and turns it in to a signal which can be read by an instrument/observer

A

a sensor

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2
Q

the tension of a strain gauge results in?

A

area narrows, resistance increases

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3
Q

strain gauge converts ?

A

force along one axis to volts

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4
Q

force platform converts?

A

force along 3 axis to volts

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5
Q

accelerometer converts?

A

acceleration to volts

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6
Q

potentiometer converts?

A

angular displacement to volts

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7
Q

motion capture converts?

A

light to volts

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8
Q

all sensors are designed to convert a physical value into a?

A

electrical signal

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9
Q

the compression of a strain gauge results in?

A

area widens, resistance decreases

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10
Q

the physical quantity or effect that can be varied in such a way as to convey info

A

signal

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11
Q

what type of signal is continuous? what type is discontinuous?

A
  • analog, digital
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12
Q

a process of converting a continuous signal into a digital signal

A

sampling

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13
Q

the sample frequency is the # of samples taken in?

A

1 second

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14
Q

the validation of specific measurement techniques and equipment

A

calibration

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15
Q

the equation used if the calibration is linear

A

y=mx+b

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16
Q

with what 2 values can we determine the force for any voltage output

A

slope and offset

17
Q

the influence of the previous history of the system on its subsequent response to a given stimulus

A

hysteresis

18
Q

the gradual change in a transducers voltage output with out an accompanying change in applied force

A

drift

19
Q

could be due to the system warmign up

A

drift

20
Q

steps of data aquisition

A
  1. sensor
  2. breakoutbox
  3. multiplexor
  4. amplifier
  5. sample and hold circuit
  6. analog to digital converter
  7. storage device
  8. software
21
Q

2 problems with the multiplexor

A
  1. effective sampling rate is decreased (the more sensors that are added)
  2. delay between taking each sample
22
Q

what is the sample skew created by?

A

the delay between taking each sample (the multiplexor)

23
Q

the # of times a signal is amplified is called a?

A

gain

24
Q

the A/D is limited by 3 things

A
  1. the range of voltages it can read
  2. the # of magnitude options
  3. the # of times options
25
Q

the magnitude resolution of an A/D is usually expressed in units of?

A

BITS

26
Q

a 4 bit has how many levels of info? a 2 bit has how many levels of info?

A
  • 2^4 =16

- 2^2 = 4

27
Q

the common # of steps is ? if the voltage range is 0-10 V, what is the amp between each step?

A
  • 4096

- 10/4096= 0.00244V

28
Q

the # of steps that divides an A/D range is called its

A

resolution

EPHE 341 (4 decks)

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