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The coupling model of defect and organic contamination was presented to analyze the coupling effects on laser-induced damage and understand the damage degradation mechanism of optical films in a closed vacuum environment. The distributions of temperature rise around an absorbing defect in multilayer ZrO 2 /SiO 2 films were computed based on the finite-element simulation. Laser induced damage tests were made to compare with the theoretical model. Test results were in an agreement with the presented model and calculated results of a temperature rise.

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With the increasing exploitation of marine gas, electric submersible pump technology has attracted more and more attention. Under the influence of the bad underground environment, the insulation performance of the electric submersible pump will gradually deteriorate during its operation, resulting in current leakage, causing phase-to-phase open circuit, fire or electric leakage to ground and other dangerous phenomena, which brings destructive damage to the electric submersible pump equipment. In order to solve this problem, this paper designs a real-time monitoring system of the leakage current for the electric submersible pump based on the principle of current mutual inductance and transducing, and constructs the indoor well condition simulation experiment. The experimental data shows that the system can monitor and display the current leakage of the electric submersible pump in real time to ensure the safe operation of the electric submersible pump.