King Fahd University of Petroleum and Minerals

Shahzada Zaman Shuja

Bekir Sami Yilbas

Muhammad A Hawwa

Mahmoud Kassas

The apparatus and method for controlling laser cutting through surface plasma monitoring provides real-time monitoring and control of laser cutting quality. Laser cutting of a workpiece is controlled through monitoring of surface plasma generation, particularly during a laser gas-assisted cutting process. The apparatus includes a Langmuir probe positioned adjacent the impingement point of the laser beam on the workpiece. The Langmuir probe is in communication with a signal analyzer for measuring electrical voltage generated by plasma generated by the cutting of the workpiece. A controller is provided for comparing the measured electrical voltage with a desired threshold voltage. Control signals are generated to selectively adjust output power of the laser responsive to the compared measured electrical voltage and the desired threshold voltage to minimize plasma generation.

Apparatus and method for controlling laser cutting through surface plasma monitoring

The method of modeling fluid flow over porous blocks utilizes heat transfer and fluid flow equations and a discretization numerical method to model heat transfer rates in a square cavity containing a pair of porous blocks. Fluid flow and heat transfer are modeled within a square cavity having an inlet and an outlet formed therethrough. The inlet and outlet are positioned opposite one another along a diagonal of the square cavity. A laminar airflow is introduced at the cavity inlet while a constant heat flux is maintained in the pair of porous blocks.

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Dhahran, Saudi Arabia

Shahzada Zaman Shuja