Question:
The device used to detect infrared radiations is
The device used to detect infrared radiations is
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Bolometers are essential for detecting infrared radiation due to their sensitivity to small changes in temperature, making them useful in various scientific and industrial applications.
Updated On: May 21, 2025
- tachometer
- bolometer
- photocell
- point contact diode
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The Correct Option is B
Approach Solution - 1
A bolometer is an instrument used for measuring the power of incident electromagnetic radiation. It is commonly used to detect infrared radiation. When infrared radiation strikes the bolometer, the material in the bolometer absorbs it and experiences a change in temperature. This change in temperature leads to a change in resistance, which is then measured and can be correlated to the power of the radiation.
Therefore, the correct answer is bolometer.
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Approach Solution -2
Step 1: Understanding Infrared Radiation
Infrared radiation (IR) is a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. It is commonly associated with heat emitted by objects.
Step 2: Importance of Detection
Detecting infrared radiation is important in various fields like astronomy, remote sensing, and thermal imaging. Specialized devices are needed to accurately detect and measure IR radiation.
Step 3: Function of a Bolometer
A bolometer is a highly sensitive device that measures the power of incident electromagnetic radiation by detecting the temperature rise in an absorbing element. When infrared radiation falls on the bolometer’s absorber, it causes a small temperature increase, changing its electrical resistance. This change is measured and used to quantify the IR radiation.
Step 4: Conclusion
Thus, the device used to detect infrared radiations is the bolometer, due to its high sensitivity and ability to measure small temperature changes caused by IR radiation.
Infrared radiation (IR) is a type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves. It is commonly associated with heat emitted by objects.
Step 2: Importance of Detection
Detecting infrared radiation is important in various fields like astronomy, remote sensing, and thermal imaging. Specialized devices are needed to accurately detect and measure IR radiation.
Step 3: Function of a Bolometer
A bolometer is a highly sensitive device that measures the power of incident electromagnetic radiation by detecting the temperature rise in an absorbing element. When infrared radiation falls on the bolometer’s absorber, it causes a small temperature increase, changing its electrical resistance. This change is measured and used to quantify the IR radiation.
Step 4: Conclusion
Thus, the device used to detect infrared radiations is the bolometer, due to its high sensitivity and ability to measure small temperature changes caused by IR radiation.
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