Scanner / Barcode

An electro/optical device that converts the bars and spaces of a bar code field into electrical signals.                                                                                                                          

Self-amplified spontaneous emission (SASE)

is one of the most promising candidates for the fourth generation light source in the vacuum ultraviolet and X-ray regions. Several SASE experiments in spectral regions from infrared to vacuum ultraviolet have been conducted worldwide in order to study technical feasibility in shorter wavelength regions and to understand the physics involved. Several SASE projects have been proposed in the short-wavelength regions, and technical investigations are being conducted on key components. One of the most critical components is the undulator, also known as the wiggler, which is designed to have a length of 100 m or more in the proposed SASE projects in the hard X-ray region.

Self-Checking / Barcode

A bar code or symbol using a checking algorithm which can be independently applied to each character to guard against undetected errors.                                                       

Self-clocking / Barcode

Having the inherent ability to give scanners the reference information they need to measure the relative positions of all the barcode elements without requiring a separate clocking track. All modern symbologies are self-clocking.

Semiconductor laser

It is a younger laser, and the more mature one is GaAs laser. It is characterized by high efficiency, small size, light weight and simple structure, and is suitable for carrying on airplanes, warships, tanks and infantry. It can be made into range finder and sighting device. However, the output power is small, the directivity is poor, and it is greatly affected by the ambient temperature.

Separator bar, separator pattern / Barcode

A row of contrasting modules that appears between the stacked rows in a 2-D stacked or composite symbology, such as GS1 DataBar Stacked. The separator pattern starts and ends with a four-module-wide space. Where the top row and bottom row modules that are vertically adjacent to a separator pattern module have the same color, the separator module is the opposite color. Where the top row and bottom row modules have different colors, the separator module is the opposite color to the separator module to the left. In a region that has complementary top and bottom row colors, this results in a pattern of alternating one-module-wide bars and spaces.