Mr. Yang Chang Profile

Yang Chang

at Beijing Univ of Technology

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Proceedings Article | 24 August 2009 Paper

The intelligent design of the high power and energy laser measurement system

Yang Chang, Jin-feng Zhou

Proceedings Volume 7381, 73811F (2009) https://doi.org/10.1117/12.834453

KEYWORDS: Sensors, Signal processing, LCDs, Laser applications, Data processing, Laser systems engineering, High power lasers, Power supplies, Computing systems, Pulsed laser operation

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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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