OPHIR vega User Manual page 100

Absorption(%) vs. Wavelength (nm)
BB - Broadband
Metallic Coating
Graph 3.
Absorption of Ophir Pyroelectric Absorbers
9.3.2. Calibration
The sensitivity of the various Ophir pyroelectric sensors
can vary from one to another as well as with
wavelengths. Therefore, Ophir pyroelectric detectors are
individually calibrated against NIST traceable standards.
In addition, there is a wavelength sensitivity correction
curve in the Meter.
Ophir pyroelectric detectors are calibrated using a
1064nm repetitively pulsed laser referenced to a NIST
traceable thermal power meter. The average energy is
set to the average power of the standard power meter
divided by the laser frequency.
The spectral absorption of the detector coating is
measured spectroscopically and the absorption curve is
used to correct the calibration for other wavelengths.
When the user selects his wavelength on the Meter, the
correction factor for that wavelength is applied.
The PD10 & PD10-PJ sensors are calibrated in a two step
fashion. First the photodiode detector - filter combination
is calibrated against a NIST traceable master over the
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