Rangefinder. Thursday , April 26th , 2018 - 18:47:34 PM
Today we will talk about just how a laser rangefinder functions. The distance to an objective is calculated by a rangefinder by the rebounding of a laser light beam off the object to be ranged. The time it takes for the laser light beam to reach the target and return is measured by a high speed digital clock. This time that commonly takes less than one second, is then computed by the rangefinder and displayed as a distance on the rangefinders build in screen.
Accuracy Laser rangefinders are extremely accurate. Most will guarantee accuracy of plus or minus 1 meter. That is more than close enough for the average person and their needs, but this may not be good enough for commercial engineering or military use. For this, it is better to use GPS range finding techniques and triangulation equations.
Also, you should be aware that all laser rangefinders operate by firing an invisible, tightly focused, beam of light at a given target and then measuring the time it takes for said beam of light to be reflected from the target and return to the rangefinder in order to calculate the distance to the target. Therefore, all laser rangefinders are adversely affected by hazy atmospheric conditions, glare, any objects between the rangefinder and the target and, objects that absorb the light beam instead of reflecting it. Consequently, even though rangefinders are designated as having a maximum distance at which that the particular unit will range a target, it should be noted that even though the manufacturer’s specifications may state a maximum distance of "X" number of yards for that particular unit, most will only range objects at that distance under optimal atmospheric conditions from highly reflective surfaces. However, when encountering atmospheric anomalies such as heat waves, glare, or even hazy conditions, any rangefinder’s ability to range objects over long distances will be reduced to between one half and one third of the stated maximum range! In addition, your ability to target and range objects may be further impaired by either poor optics or an overly bright reticle. Thus, some models of laser range finders feature a fixed amount of magnification but, it should be noted that while this feature does make your target appear larger in the view screen, it does not enable the rangefinder to measure accurately at longer ranges. Also, in addition to magnification, the better quality units feature multi-coated lenses that reduce glare and increase clarity which also helps you target your chosen quarry.
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