
Optical power meter
OverviewExtended sensitivity metersSensorsPower measuring rangeCalibration and accuracyPulse power measurementCommon fiber optic test applicationsTest automation
A class of laboratory power meters has an extended sensitivity, of the order of -110 dBm. This is achieved by using a very small detector and lens combination, and also a mechanical light chopper at typically 270 Hz, so the meter actually measures AC light. This eliminates unavoidable dc electrical drift effects. If the light chopping is synchronized with an appropriate synchronous (or "lock-in") amplifier, further sensitivity gains are achieved. In practice, such instruments usually achieve lower absolute acc
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