October 2019 – Paul Wu's Blog

Plasma diagnostic

Three techniques are adopted for plasma diagnostic (electron temperature, electron density): Optical Emission Spectrum (OES), Thompson scattering, and Langmuir probe.

Off-Axis Inverted Cylindrical Magnetron (ICM) Sputtering

Kurt J. Lesker Company (KJLC) introduced a novel optical coating system incorporating the Isoflux Inverted Cylindrical Magnetron (ICM).

Off-axis sputtering and Face target sputtering

In conventional on-axis sputtering, plasma and high energy ions/atoms may damage the desired film, leading to unexpected properties. Therefore, off-axis and face target sputtering are developed.

Polarizer

Polarizers are critical components for LCD display industry. The following slide summarizes the basics for the polarizers.

Optical path for HTPS projection engines

Optical path of a high temperature polysilicon (HTPS) projection engines is shown in the following Figure.

Photo elasticity based stress analysis

Mechanic deformation can lead to the optical property change in an optical media, which is called photo elasticity. Therefore, this principle is commonly adopted to investigate the stress distribution in a material.

Water proof breathable membrane

US 3,953,566 teaches a method to make a water proof breathable membrane based expandable, amorphous locked Poly tetrafluoroethylene (ePTFE).

Formation of Bénard cells

There is a drying pattern called “Bernard cell”, which is particularly easy to present in solvent borne solution drying.

Polymer foams

Polymers foams are widely used in a variety of applications, e.g. heat/water/air insulation, impact cushion, vibration absorption. Major foam materials are polyurethane (PU), polystyrene (PS), polyethylene (PE), polypropylene (PP), poly(vinyl chloride) (PVC), polycarbonate (PC); the order is roughly based on the amount of annual consumption.

Keynote Vs vibration frequency

From vibrationdata.com, the following table lists vibration frequency for each piano keynote.