The Agilent 816x VXIplug&play Instrument Driver Lambda Scan Applications
236 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
Equally Spaced Datapoints
A linear interpolation is performed on all wavelength and power data fo r
the Lambda Scan Application and is optional for the Multi Frame Lambda
Scan Application.
The advantage of spacing all meas urements equally is that presentin g
results through use of a spreadsheet is greatly simplified. The operation
returns one wavelength array and a power array for each power meter
channel.
The disadvantage of using equally spaced datapoints is that the linear
interpolation is analogous to the use of a low pa ss filter. Figure 18 shows
the original curve as measured dire ctly by a Power Meter and the
interpolated curve.
Interpolation will always tend to produce a smoother curve by rounding off
any peaks in the curve.
Figure 18 Equally Spaced Datapoints
Original
Curve
Interpolated
Curve