Principles of Operation 121 121
Figure 66 Typical Newport Energy Detector Signal Waveform
An energy detector signal sharply rises to a peak value and then decays going somewhat
negative before finally returning to zero. The energy in the radiant pulse is proportional to
the height of the peak measured from immediately before the sharp rise.
Figure 67 Negative Baseline Voltage.
Negative Baseline Voltage Due to a Pulse Trainshown. If a laser pulse arrives before the
previous Energy detector signal has fully decayed, the detector signal rises from the present
decay point of the previous signal.
9.7 Peak-to-Peak (Photodiode) Detector Signals
The 1936/2936 Series allows one to make peak-to-peak measurements of
time varying signals from semiconductor photodiode detectors. Since optical
power is a zero bounded positive quantity, signals from a detector observing
such modulated light will similarly be zero bounded positive signals.
To make a peak-to-peak measurement, the 1936/2936 Series must be able to
capture both the maximum and minimum values of a detector signal. This is
accomplished by sampling.
To Next Page
Loading...
Need help?
General
