Calorimeters and Pressure Sensing Quiz
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Questions and Answers

Which type of thermal detector is sensitive to temperature change?

  • Thermocouple (correct)
  • Bolometer
  • Thermistor
  • Golay cell

    • How does a Golay cell detect radiation?

  • By being part of an electric circuit to detect radiation presence
  • By measuring pressure changes in a gas due to heating (correct)
  • By changing the resistance of a metal wire or semiconductor
  • By absorbing energy per unit time

    • What property does a thermistor change when exposed to heat?

  • Conductivity
  • Pressure
  • Temperature
  • Resistance (correct)

    • In which thermal detector is the sensitive element part of an electric circuit?

    <p>Bolometer</p> Signup and view all the answers

    What does the output of thermal detectors depend on?

    <p>Heat absorbed per unit time</p> Signup and view all the answers

    What factor determines the response time of thermal detectors?

    <p>$H \tau = G$</p> Signup and view all the answers

    What is the figure of merit to evaluate the volume-sensed calorimeter in beta liquids?

    <p>Thermal expansion coefficient</p> Signup and view all the answers

    What property is required to maximize sensitivity in a volume-sensed calorimeter for beta liquids?

    <p>Small thermal expansion coefficient</p> Signup and view all the answers

    Which type of detector can be used for pressure sensing, specifically in the context of changing gas pressure?

    <p>Golay cell</p> Signup and view all the answers

    What type of detector is known for its change of resistance property?

    <p>Thermistor</p> Signup and view all the answers

    Which detector operates based on the change of gas pressure?

    <p>Golay cell</p> Signup and view all the answers

    What property characterizes pyroelectric detectors?

    <p>Temperature-sensitive ferroelectric material</p> Signup and view all the answers

    What is the relationship between temperature change and the current produced in the Pyroelectric detector?

    <p>Directly proportional</p> Signup and view all the answers

    Which parameter determines the rate of change of polarization with temperature in the Pyroelectric detector?

    <p>Sensitive area of detector</p> Signup and view all the answers

    What is the minimum detectable radiation power for the Pyroelectric detector?

    <p>$10^{-9}$ W</p> Signup and view all the answers

    How is the Pyroelectric detector's response to high frequencies characterized?

    <p>Fast response but low sensitivity</p> Signup and view all the answers

    What does the Pyroelectric detector use to convert absorbed radiation into current?

    <p>Bolometer</p> Signup and view all the answers

    What material is used between two poles in the Pyroelectric detector to produce a current through the load resistance?

    <p>Ferroelectric material</p> Signup and view all the answers

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