ISO , Optics and optical instruments — Lasers and laser-related equipment — Vocabulary and symbols; ISO , Lasers and laser-related equipment. ISO. First edition. Lasers and laser-related equipment —. Test methods for laser beam widths, divergence angles and beam propagation. ISO/TR. First edition. Lasers and laser-related equipment — .. in ISO and ISO are essentially based on (but not.
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The solution for D86 is found by computing the area of increasingly larger circles around the centroid until the area contains 0.
For astigmatic beams, however, a more rigorous definition of the beam width has to be used:. International standard ISO This page was last edited on 18 Decemberat isoo Retrieved from ” https: Since beams typically do not have sharp edges, the diameter can be defined in many different ways.
From Wikipedia, the free encyclopedia. Five definitions of the beam width are in common use: For example, applications of high-energy laser weapons and lidars require precise knowledge of how much transmitted power actually illuminates the target. The main advantage of this scanning method is that it is free from pixel size limitations as in CCD cameras and allows beam reconstructions with wavelengths not usable with existing CCD technology. The D86 width is often used in applications that are concerned with knowing exactly how much power is in a given area.
The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. To overcome this drawback, an innovative technology offered commercially allows multiple directions beam scanning to create an image like beam representation.
Beam diameter – Wikipedia
Retrieved June 3, Most CCD beam profiler’s software can compute the knife-edge width numerically. Full width at half maximum. By using 1146-2 reconstruction, mathematical ixo reconstruct the laser beam size in different orientations to an image similar to the one produced by CCD cameras.
The term “beam width” may be preferred in applications where the beam does not have circular symmetry. The angular width is also called the beam divergence. Retrieved July 2, The main drawback of the knife-edge technique is that the measured value is displayed only on jso scanning direction, minimizing the amount of relevant beam information.
Intrinsic and geometrical laser beam classification, propagation and details of test methods. Beam diameter usually refers to a beam of circular cross section, but not necessarily so.
МКС EN ISO 11146-2:2009
Reconstruction is possible for beams in deep UV to far IR. The definition given before holds for stigmatic circular symmetric beams only.
Unlike other systems, a unique scanning technique uses several different oriented knife-edges to sweep across the beam. The width of laser beams can be measured by 111446-2 an image on a cameraor by using a laser beam profiler. The beam width can isoo measured in units of length at a particular plane perpendicular to the beam axis, but it can also refer to the angular width, which is the angle subtended by the beam at the source.
The fraction of total beam power encompassed by the beam width depends on which definition 11164-2 used. The baseline is easily measured by recording the average value for each pixel when the sensor is not illuminated.
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The simplest way to define the width of a beam is to choose two diametrically opposite points at which the irradiance is a specified fraction of the lso peak irradiance, and take the distance between them as a measure of the beam’s width. Before the advent of the CCD beam profiler, the beam width was estimated using the knife-edge technique: This is the beam diameter definition that is used for computing the maximum permissible exposure to a laser beam.
By 1116-2 moving the knife edge across the beam, the amount of energy impinging the detector area is determined by the obstruction. The angle between the maximum peak of radiated power 1146-2 the first null no power radiated in this direction is called the Rayleigh beamwidth.