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With the development of the laser technology, electronic technology, as well as computer technology, the traditional laser
power measurement couldn't meet the demand. We design a new type of laser power measurement for the high power
and intelligent measuring: compared with the traditional one-sensor laser power measurements, we select three different
kinds of sensors which are the thermocouple, photoelectric cell and flow meter to get multi-signals. We use the
thermocouple and flow meter in order to calculate the power of the laser, and photoelectric cell is used to depict the
waveform of the laser pulse. The processing system is based on the AVR embedded system which includes signal
sampling, data storage, algorithmic processing and both the waveform and the numerical results displaying, meanwhile
the system connects and uploads the data to the computer, finally realizes the functions of data processing and saving for
the further research. During the working time of the laser, the system can monitor the power and energy in real time;
calculate the results of the power, energy and other significant parameters, show the waveform as well. The figures of the
system are that substituting the metal senor for the flow water sensor which realizes the higher power and energy
measurements; using multi-channel sensors that get the power, energy and waveform results; introducing the AVR
processor which ensure high speed processing and the reliability of the system. The real-time algorithm makes the A/D
sampling of the three-channel sensors in time, and the integral compensation algorithm makes the results more precise.
The last, the method of "inner loop" and "outer circle" meet the different demand of the measurement which makes you
have more choices. In practice, due to the interference, we also put efforts to solve the interference of the power supply
and the electro-magnetic interference (EMI).
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