Ophir Optronics Ltd QSR Manual De Usuario
Appendix B – Calibration, Traceability,
and Recalibration
and Recalibration
Ophir develops three main types of heads: thermopile, photodiode, and
pyroelectric. Each type of head needs to be calibrated and recalibrated in a
specific way.
pyroelectric. Each type of head needs to be calibrated and recalibrated in a
specific way.
Ophir Thermopile Heads
Ophir develops two kinds of thermopile heads – Surface Absorbers and Volume
Absorbers. This section describes the range of Ophir thermopile heads.
Absorbers. This section describes the range of Ophir thermopile heads.
Surface Absorbers
BB (Broadband) Absorber - A special refractory coating is used to provide
high absorption from the UV through to the IR on standard, high power density,
broadband monitor heads. This coating withstands very high power densities, of
up to 20 kW/cm², without changing calibration. The absorption ability of this
coating is above 90% for most of its range.
high absorption from the UV through to the IR on standard, high power density,
broadband monitor heads. This coating withstands very high power densities, of
up to 20 kW/cm², without changing calibration. The absorption ability of this
coating is above 90% for most of its range.
EX (Excimer) Absorber - The EX Absorber provides high absorption in the
UV, and can withstand both the pulse energies and the average power of excimer
lasers. These discs also have excellent absorption for 10.6
UV, and can withstand both the pulse energies and the average power of excimer
lasers. These discs also have excellent absorption for 10.6
µm and other
wavelengths. Therefore, they can also be used for other types of lasers.
LP1 (long pulse) absorber - This absorber has a very high damage threshold for
long pulse (ms) or continuous lasers and is therefore offered for use with
high power and energy lasers. It is calibrated for the spectral range 250 –
2200nm with some heads also being calibrated for 2940nm. It is not suitable for
long wavelength CO2 operation.
long pulse (ms) or continuous lasers and is therefore offered for use with
high power and energy lasers. It is calibrated for the spectral range 250 –
2200nm with some heads also being calibrated for 2940nm. It is not suitable for
long wavelength CO2 operation.
LP (Long Pulse) Absorber - The LP Absorber has a particularly high damage
threshold for long pulse (ms), or continuous lasers and is therefore offered for
use with high power heads. It is calibrated for use with the YAG laser at
1.064
threshold for long pulse (ms), or continuous lasers and is therefore offered for
use with high power heads. It is calibrated for use with the YAG laser at
1.064
µm, or the CO
2
laser at 10.6
µm, and absorbs about 90% at these
wavelengths.
The absorption of the various Ophir absorbers as a function of wavelength is
shown in Figure B-1 on page 94.
shown in Figure B-1 on page 94.
Volume Absorbers
P (Pulse) Type Absorber - The models with the P suffix, are used with pulsed
lasers, and have a special absorbing glass with an absorbance of 95 +2% over the
operating range. Since the surface is glass, its reflectivity does not change even if
damaged or melted locally.
lasers, and have a special absorbing glass with an absorbance of 95 +2% over the
operating range. Since the surface is glass, its reflectivity does not change even if
damaged or melted locally.
HE/HE1 (High Energy) Absorber - The HE and HE1 Absorbers have a
particularly high damage threshold for pulsed and repetitively pulsed lasers, of
particularly high damage threshold for pulsed and repetitively pulsed lasers, of
StarLab User Guide
93