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The method is to direct the laser beam with a parabolic mirror into a cylindrical absorber. There is an absorbing coating on its inner surface. Thus, the laser power will be absorbed more uniformly on the surface and any radiation leakage is avoided. This system can be used for highest laser powers and power densities.
With a high-precision measurement of the temperature difference and flowrate of the coolant, the power of the absorbed laser beam can be determined exactly.
All parts in the device which get in contact with the cooling water are made of copper or brass to avoid any corrosion in the coolant circuit (due to different chemical potentials).
A pneumatic shutter is used to close the beam input aperture and to protect the entrance mirror of the EC-PowerMonitor against dust.
An electronic calibration was integrated for self-testing.
Instead of the laser, a heating element can be used to heat the coolant. This way, two independent systems can be compared for self-test purposes:
1. The calorimeter that measures the heat flow through the absorber.
2. The amount of electric energy that passed through the heating element.
This redundancy of two independent measuring systems ensures maximum reliability.