Signal Recovery with PMTs
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چکیده
In general, the choice between boxcar averaging (gated integration) and lock-in detection (phase sensitive detection) is based on the time behavior of the signal. If the signal is fixed in frequency and has a 50 % duty cycle, lock-in detection is best suited. This type of experiment commonly uses an optical chopper to modulate the signal at some low frequency. Signal photons occur at random times during the 'open' phase of the chopper. The lock-in detects the average difference between the signal during the 'open' phase and the background during the 'closed' phase.
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