Block 3 - lecture 8 Flashcards

1
Q

Potentiometric sensor?

A

A coil of wire with adjustable connectors to change the length of the wire

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2
Q

circuit for a potentiometric sensor?

A

as the feedback resistor in an inverting amplifier circuit

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3
Q

equation for potentiometric inverting amplifier output?

A

Vout = -Rsensor/R * Vin

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4
Q

capacitive sensor?

A
  • two places move together/apart (distance reduces capacity)

- two plates move over each other (area reduction reduces capacity)

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5
Q

induction sensors?

A
  • permeable core moves through an AC solenoid

- solenoids either side have a current induced, proportional to the distance from the centre

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6
Q

types of level sensors?

A
  • concentric cylindrical capacitor

- above/below surface ultrasonic sensor

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7
Q

strain sensor?

A

extension (strain) in wire increases the length and decreases the area, thus increasing the resistance

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8
Q

equation for resistance from strain?

A

resistance change = 2Rstrain

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9
Q

types of motion sensor?

A
  • rectilinear (movement in a direction)
  • angular
  • vibration
  • shock (sharp acceleration)
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10
Q

accelerometer?

A

mass on a spring

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11
Q

important accelerometer considerations?

A
  • should cover expected accelerations

- should have an natural frequency higher than that being measured

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