Chapter 2The theory and the principles involved.Equipment levels inside and outside the building by studying the relevant documents and research. Researchers presented in the style of editorial synthesis Is as follows: 1. related documents 1.1 context of the population changklum Career Builder 1.2 the level. 1.5 laser properties. 1.6 customer satisfaction 2. related research. 2.1 related documents2.1.1 context the population's occupations construction engineerConstruction construction activity or action that is causing the. The Assembly or installation of a building, structure, system utilities, or the composition of what is said above, and often refers to the civil community is mainly.The construction of a professional practice, one branch of which is composed of wood construction, plaster work, concrete work. Steel Technicians who perform work that will sprout by the types of jobs, such as carpentry. Bill mechanic, cement etc., the words as a whole, construction and investment professional who has been hired to work in construction is called regular if the contractor.2.1.2 to determine levels.Usually in the form of construction or the configure level + 0.00, may provide a road level + 0.00, so we need to level the ground higher ground approximately 20-30 cm. level features: 4.10 images. 2.1.3 LeisureLaser (English: laser light amplification "stands by stimulated emission of radiation [1]) in physics, is a device to beam with a characteristic, which is a combination of mechanical science technology quantum laser energy to thermodynamics, which can have a variety of properties, depending on the purpose of design. Most of the laser beam is smaller. There is little deviation (low-divergence beam) and can identify the wavelength by the color of the laser. If you are in the tram overlooking sapek by naked eye (visible spectrum) that these other laser is a total energy output comes from several light wavelength.The laser energy, including through the media, lighting, led lighting can be either solid, liquid. The free electron gas, or that can be light. In the simplest model on Cavite. properties (Optical cavity) consists of an arrangement of glass 2 light together again and again by the media, that each one is charged with the light in the mirror. (Output coupler) will submit the light out.The laser beam through the media light will have a specific wavelength is increased power that this glass is trying to make the most of the light. Lighting can be through the media, and a laser beam. The process of induction energy beam to increase the power or light in many wavelength in each trial. Wavelength of light at each wavelength will result in direct property. The shape and the wavelength of the laser creates a beam out.2.1.3.1 laser properties.2.1.3.1.1 has a certain direction (Directionality) laser beam parallel to all kits are not far out. Thus, the intensity of the laser beam is reduced very little in sight.2.1.3.1.2 is Rong (Monochromaticity) documents with laser beam wavelength only a single value. Light of light that we see in everyday life, such as a lamp, and the Sun is white, if, through the prism of this white light, you will see different color bar along steadily, from purple to red. It is called the spectral bar of helium-neon laser, such as a laser when the laser's red light, helium-neon through the Prism will not be split into multiple lines, but there is still only one line with the 632.8 nm wavelength.2.1.3.1.3 is true (Brightness) laser beam headlights with distinctive characteristics unique to other commercial-type light source intensity is higher and when the beam fell, failing objects spark effects of beam (Laser Speackle) Especially when it has a coarse, and even house dust or smoke particles floating close by, which is a competitive and comprehensive random loop. This is due to the reflection of the laser beam does not have a direction to the particle or object surface and insert and matching of beams, spark up a dimension of sight, using Laser light, laser displays are low, such as Le se อรืฮีเลี o-neon-1 mW, with a higher light intensity of the Sun. Therefore, if a projection into the human eye, it will be harmful to the eyes to the blind.2.1.3.1.4 is a House (coherence) adidas electric bulbs emitting light consists of many small atoms, each atom acts as a light source so that each atom was light out freely. The light was released from the bulbs have different phase and wavelength. Moreover, each wave has been released with direction uncertain or a random light from conventional light source is generally known as the cattle he t light (light incoherence), the origin of the laser beam is one of every color. Waves of laser beam is the same phase out so so called laser light chrome Hi-t (coherence light).2.2 related research. Research on the laser occurs for the first time in May 1960 by Theodore's 50-year man (Theodore Maiman) Research Institute (Hughes Research Laboratories), Hugh today makes laser industry several billion images Don la. The output from a laser research and made a device that is widely used. See, for example, a DVD player, CD DVD barcode reader laser metal cutting equipment, etc, to see if the laser is widely used. Whether it's the science industry Medical or even militarily, because they can control the laser wavelength, as needed.Come Te data collection1. the average by using a formula.Average. Average of the scores. The sum of the scores. The total number of2. the standard deviation using a formula. S.D. = S2 = (N instead of number of persons)3. consistency index value, using the formula IOC = index integrity tools. R = The total score of the opinions of the experts. N = number of specialists.
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