What is the advantage of a linear thermopile ?

Explanation

### Step-by-Step Solution:

1. **Understanding Thermopiles**: A thermopile is a device that converts thermal energy into electrical energy. It consists of multiple thermocouples connected in series or parallel, which allows it to measure temperature differences and generate a voltage.

2. **Principle of Operation**: The thermopile operates based on the Seebeck effect, where two different metals joined at two junctions produce a voltage when there is a temperature difference between the junctions. This voltage is proportional to the temperature difference.

3. **Linear Thermopile Advantage**: The primary advantage of a linear thermopile is its ability to measure the intensity of radiation across a narrow band of wavelengths. This specificity allows for more accurate measurements in applications where precise thermal radiation detection is required.

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