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How to Measure Accurately Using a Thermopile Detector

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How to Measure Accurately Using a Thermopile Detector

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This technical note provides information on how to set up an optical power meter and detector system in order to make accurate measurements when using a thermopile detector.When choosing a thermopile detector, it is a safe practice to select a detector with a higher damage threshold specification than that of the actual laser beam power/energy density (J/cm2 or W/cm2).1 A good rule of thumb is to select a detector with a damage threshold that is at least twice the expected power density of the laser you are measuring. For maximum power measurement accuracy, select a detector that has its maximum average power (W) that is approximately twice the value you wish to measure. These guides will give some allowance for hot spots and unexpected fluctuations in the laser beam power.

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