DOPRT1II56789IIIIISRPFFAT4SYROSSECCA GNNNACSTNEMURTSNGNYEVRUSI / RESALYROSSECCA GNYEVRUSLOOTGNRUSAEM TNEMURTSNGNTSETI ELOSSNGRESALM2Not alignedMyzox prism coatingNot alignedPrisms are optical polyhedrons made of glass that are meticulously polished to achieve a smoothand transparent surface. They are utilized to disperse, refract, and achieve total internal reflectionof light. Additionally, prisms play a crucial role in distance measurement using total stations.By precisely reflecting the emitted light back to the instrument, prisms enable accurate distancecalculations and surveying operations.By applying a silver coating to the prism surface, the reflectiveproperties are enhanced, allowing for a wider measurementangle range. This means that the prism can accurately reflectand transmit light within a broader range of incident angles.The measurement distance is not simply the distance to the prism reflection point (pic.1)or the tip of the prism (pic.2). When a laser is emitted from a total station, it reflects threetimes within the prism (pic.3). The speed of the laser inside the prism is slower than inthe air. Taking into account the calculated distance, laser speed, and refraction rate insidethe prisms, the actual measurement point is located behind the prism position (pic.4).The prism has to be aligned perfectly to the line of sight of the total station.When aligning the instrument, it is important to align not only the center of the prismbut also the tip of the probe, pole and shoe for more precise measurement results. The angle error occurs when the collimation position of the total station deviatesfrom the target point position.Alignedwith silver coatingwithout coatingPrism centeronPole linePrism centeronProbe lineSilver coatingPaintingPrevents corrosionfrom moisture.Silver coating provides the highest reflectivity among metals,making it the most suitable for total stations. Silver coatinghas over 98% reflection rate at the range.at wide rangeOver 98%Prism constant : 0mmPrism constant : -30mmActualmeasurement pointThe speed of light in the prism is slowerthan in the air. When the alignment is notcorrect, the optical path becomes longer,resulting in distance measurement errors.Therefore, to minimize the errors, it isnecessary to align the instrumentsproperly.Total stationwavelength bandAlignedMeasurement point(Myzox Prism)30mm028Myzox’s PrismsSilver CoatingPrism ConstantAngle ErrorDistance Error3PPRISM10What is a prism?
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