Tang Yuguo

A nanometer scale alignment method of concentric spherical mirrors based on interferometry

A nanometer scale alignment method of spherical concentric mirrors based on dual-beam interferometry is proposed, which is also the method to measure the defocus of concentric spherical mirrors. In the process of aligning the concentric spherical mirrors, the defocus can be measured real time with nanometer scale error. The experimental result shows that the method can achieve the defocus of the spherical concentric mirrors several nanometers.

Notice of Retraction Carbon content detection methods' research in the AOD furnace

In the process of smelting of iron alloy, the carbon content has been a most important reference to the control of refining end. This article describes the commonly used off-line detection methods about carbon content of hot metal smelting furnace, including chemical analysis and spectrometry, and introduces the on-line measurement principle, measuring devices, and modeling based on the lights intensity value.