Abstract: This disclosure relates to non-destructive estimation of coating layer thickness based on sweep frequency photo acoustic guided wave technique. Coating of a substrate/surface protects it from wear, corrosion and serves the cosmetic aspect, hence making coating technology is an essential part industrial process. The existing techniques for coating thickness determination are either destructive or requires a prior knowledge of the refractive index of the surface under investigation or use of sophisticated instrumentation, complicated procedure and harmful radiation during industrial deployment. The disclosure utilizes an intensity modulated Continuous Wave (CW) laser diode to excite a sample thus, making the technique a partially contact based method. Further a calibration curve is plotted by determining a frequency spectrum and resonance frequency. The calibration curve is used for estimation of a coating layer thickness.

Abstract: A coated solar control glass article includes a transparent substrate provided with a multilayer coating having solar control properties is disclosed. The multilayer coating includes a metal nitride functional layer sandwiched between two transparent dielectric layers. The thickness of the dielectric layer provided above the functional layer is greater than 60 nm and less than 150 nm and the thickness of the dielectric layer provided above the transparent substrate is greater than 10 nm and less than 45 nm. The coated solar control glass article exhibits gold/rose/purple colored reflection on the side opposite to the side provided with the multilayer coating.

Abstract: A solar control glass article includes a transparent substrate provided with a thin multilayer coating having solar control properties. The thin multilayer coating includes an absorber layer sandwiched between a first and second transparent dielectric layers, a functional layer protected by an upper and lower blocker layers and a third transparent dielectric layer provided over the upper blocker layer. The thickness of the functional layer and the thickness of the transparent dielectric layers are adjusted to give a gold colored reflection on a surface opposite to the first surface of the transparent substrate provided with a thin multilayer coating.

Abstract: A coated solar control glass article includes a transparent substrate provided with a multilayer coating having solar control properties is disclosed. The multilayer coating includes a metal nitride functional layer sandwiched between two transparent dielectric layers. The thickness of the dielectric layer provided above the functional layer is greater than 60 nm and less than 150 nm and the thickness of the dielectric layer provided above the transparent substrate is greater than 10 nm and less than 45 nm. The coated solar control glass article exhibits gold/rose/purple colored reflection on the side opposite to the side provided with the multilayer coating.

Abstract: A solar control glass article includes a transparent substrate provided with a thin multilayer coating having solar control properties. The thin multilayer coating includes an absorber layer sandwiched between a first and second transparent dielectric layers, a functional layer protected by an upper and lower blocker layers and a third transparent dielectric layer provided over the upper blocker layer. The thickness of the functional layer and the thickness of the transparent dielectric layers are adjusted to give a gold colored reflection on a surface opposite to the first surface of the transparent substrate provided with a thin multilayer coating.