Ophir Optronics Ltd QSR ユーザーズマニュアル
Appendix B – Calibration, Traceability, and Recalibration
Ophir Pyroelectric Heads
2. Apply the known laser power.
3. Adjust the Calibration Factor until the Adjusted measurement equals the
power applied to the head.
4. Click Save to save the adjustment for the active channel.
Note: The relative readings at different wavelengths are fixed by the
wavelength calibration curve stored in the head EEROM. When
changing the calibration at one wavelength, the calibration at all
other wavelengths changes proportionately.
changing the calibration at one wavelength, the calibration at all
other wavelengths changes proportionately.
Ophir Pyroelectric Heads
This section discusses calibration of Ophir pyroelectric heads. Two types of
absorber surface are used in Ophir pyroelectric measuring heads:
absorber surface are used in Ophir pyroelectric measuring heads:
Metallic – Metallic heads do not have a BB suffix in the head name.
They have a partially reflective multi-layer metallic coating that
absorbs approximately 50% of the laser pulse, refer to Figure B-6.
They have a partially reflective multi-layer metallic coating that
absorbs approximately 50% of the laser pulse, refer to Figure B-6.
The
metallic coating permits very high repetition rates, up to 5000Hz, as
well as relatively high damage threshold.
well as relatively high damage threshold.
•
• Broadband – Broadband heads have a BB suffix in the head name.
They have a broadband black absorbing coating to provide high
absorptivity from the UV through the IR.
absorptivity from the UV through the IR.
This coating can withstand
energy densities, up to 0.3J/cm² for short pulses and 2J/m² for long
pulses, without changing calibration.
pulses, without changing calibration.
The absorption of this coating is
above 90% for most of its range, refer to Figure B-6.
This coating is
available for the PE50 and PE25.
Figure B-6 Absorption of Ophir Pyroelectric Absorbers
Absorption(%) vs. Wavelength (nm)
StarLab User Guide
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