How can be practically measure the efficient of second harmonics generation and other higher harmonics?
Dear Raad
Please see these attachements sites
Regards
https://www.sciencedirect.com/topics/chemistry/second-harmonic-generation
https://ieeexplore.ieee.org/abstract/document/161322/
A spectrum analyzer can provide you details of individual (V and I) harmonics up to high orders.
Three phase network power quality analyzer can give you the value of all harmonics. Second harmonic can be used as criterion for transformer inrush current detection to differentiates it from fault current.
power analysers can provide harmonic measurements of voltage or current individually.
A fluke power quality analyzer is good for harmonics, losses, active power , reactive power measurement.
A fluke power quality analyzer can be used. Power Quality is a measure of how well a system supports reliable operation of its loads. A power disturbance or event can involve voltage, current, or frequency. Power disturbances can originate in consumer power systems, consumer loads, or the utility.
Practical measurement for second and higher harmonics today can be carry out on several ways with different equipment. Those equipment can be very simple one and cheap, and with complex solutions. Measurement can be done on 220 V in room or somewhere in substation or generations plant. First one is one is simple task and others a little complex one. You can use power quality devices which have implanted IEC (or some other) norm for this purposes. With that devices and appropriate software, you can get nice report. In addition, you can use other solutions, oscilloscope, portable Phasor measurement devices (PMU also you can use rack mounted solutions) or even testing devices for testing relay protection or metering devices (Omicron producer, CMC 156 or 256). Some Labview card can help you also.
A fluke power quality analyzer can be used for harmonics, losses, active power , reactive power measurement.
Usually the HH efficiency is determined by comparison of the fundamental laser power P(\omega) and higher harmonics P(n \omega). The exact formula can be found in standard experimental NLO textbook. Also you can find it here:
Article High-efficiency, multicrystal, single-pass, continuous-wave ...
Dear colleague Hendradi Hardhienata, thank it is very useful reply
regards
Raad
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