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Electronic speckle pattern interferometry (ESPI), [1] also known as TV holography, is a technique that uses laser light, together with video detection, recording and processing, to visualise static and dynamic displacements of components with optically rough surfaces. The visualisation is in the form of fringes on the image, where each fringe ...
Illustration of the effect that different types of chokes have on the spread ("pattern") of shotgun projectiles. A choke is a tapered constriction of a firearm barrel at its muzzle end. Chokes are most commonly seen on shotguns, but are also used on some rifles, pistols, or even airguns. [1]
In shotgun shooting, the grouping is also called the pattern or "spread". The pattern indicates the extent of scattering by shots from a single shotshell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is choked to deliver a wider or narrower scattering, depending on the expected use. Shooting at ...
Singaporean soldier aiming a SAR 21 with laser sight. A laser sight is a device attached or integral to a firearm to aid target acquisition. Unlike optical and iron sights where the user looks through the device to aim at the target, laser sights project a beam onto the target, providing a visual reference point.
The angle between the overlapping laser beams and the wavelength of the used laser determine the structure size (period) of the applied periodic intensity distribution. In contrast to other laser-based processing methods, such as direct laser writing, the laser beam diameter has not to be focused. This means that a significantly larger area can ...
Precision-guided small arms prototypes have been developed which use a laser designator to guide an electronically actuated bullet to a target. [8] Another system in development uses a laser range finder to trigger an explosive small arms shell in proximity to a target. As of 2009, the U.S. Army has plans to use such devices in the future.
The user then adjusts the iron sights or scope reticle to align the point of aim with the projected laser dot. Another more commonly used type of laser boresighter is attached to the muzzle of the barrel, either inserted straight into the bore ("arbor" type) or held in alignment with the barrel via a magnet, and projects a laser beam onto the ...
A laser engraving machine consists of three main parts: a laser, a controller, and a surface. [2] The laser is a drawing tool: the beam emitted from it allows the controller to trace patterns onto the surface. The controller determines the direction, intensity, speed of movement, and spread of the laser beam aimed at the surface.