35
Detector Signal
Numerical Integration
Trapezoid Method
Magnitude of the
Integrated Result
Figure 15 – Integrated Energy Via a Trapezoid Approximation - The INTG
measurement mode performs a discrete integration at a 400 Hz sample rate.
Two common applications are natural extensions of the INTG measurement
mode:
1. Pulse laser energy measurement using with a thermopile detector, Section 3.5
2. Energy from exposure over a period of time (dosage), Section 3.6.
Input Optical
Pulse Energy,
E (
λ
)
Detector's Voltage
Pulse
Integrate Voltage
to find
E (
λ
)
E (
λ
)
V (t)
E (
λ
) =
V (t) dt
R (
λ
)
1
∫
Figure 16. Measuring Laser Pulse Energy with a Thermopile - Thermopiles
are often used to measure pulsed laser energy by integrating the response of
the detector to the pulse.
3.9
Analog Output
The Model 2835-C provides a 0 to 2.5 volt, into 50W,BNC analog output for
signal monitoring. The analog output is the actual amplified detector signal
and is uncorrected for the effects of the detector’s responsivity, AUTO CAL,
and ZERO.
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