18 Questions
Which type of thermal detector is sensitive to temperature change?
Thermocouple
How does a Golay cell detect radiation?
By measuring pressure changes in a gas due to heating
What property does a thermistor change when exposed to heat?
Resistance
In which thermal detector is the sensitive element part of an electric circuit?
Bolometer
What does the output of thermal detectors depend on?
Heat absorbed per unit time
What factor determines the response time of thermal detectors?
$H \tau = G$
What is the figure of merit to evaluate the volume-sensed calorimeter in beta liquids?
Thermal expansion coefficient
What property is required to maximize sensitivity in a volume-sensed calorimeter for beta liquids?
Small thermal expansion coefficient
Which type of detector can be used for pressure sensing, specifically in the context of changing gas pressure?
Golay cell
What type of detector is known for its change of resistance property?
Thermistor
Which detector operates based on the change of gas pressure?
Golay cell
What property characterizes pyroelectric detectors?
Temperature-sensitive ferroelectric material
What is the relationship between temperature change and the current produced in the Pyroelectric detector?
Directly proportional
Which parameter determines the rate of change of polarization with temperature in the Pyroelectric detector?
Sensitive area of detector
What is the minimum detectable radiation power for the Pyroelectric detector?
$10^{-9}$ W
How is the Pyroelectric detector's response to high frequencies characterized?
Fast response but low sensitivity
What does the Pyroelectric detector use to convert absorbed radiation into current?
Bolometer
What material is used between two poles in the Pyroelectric detector to produce a current through the load resistance?
Ferroelectric material
Test your knowledge on calorimeters, figure of merit, density, specific heat capacity, thermal expansion coefficient, and pressure sensing in gases. Understand the requirements to maximize sensitivity and the difference between specific heat capacities at constant pressure and volume.
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