How the laser rangefinder works

Due to the way the laser rangefinder works, it is possible to measure the planes with maximum accuracy. Therefore, it is used in military affairs, construction astronomy, engineering geodesy, etc.

Laser rangefinder

The laser range finder is a convenient modern device for measuring surface areas.

It is an electronic type of tape measure. This device is quite easy to use, so it is used by professional teams, and novice builders too.

Instructions for working with such a tool is as follows:

  1. The range finder is turned on at the required option.
  2. Next, it is installed near one of the working surfaces.
  3. The laser beam is directed to the opposite side of the room.
  4. Similar measurements are carried out and other planes.
Laser Range Finder

Laser rangefinder device.

Thanks to such simple actions, the range finder will display the size of the area of ​​the room. If you need to calculate the volume, act the same. All devices of this type work according to a similar principle.

One of the main conveniences of the range finder is that it replaces a calculator and a notebook with a pencil. Each model can add and subtract existing values, and the resulting figures are automatically saved. But the main thing here is to know whether the device can lose data if you extract a flash card from it.

In order for the laser range finder to give accurate readings, it is very important that the perpendicularity of the tape measure is met. To facilitate this task, modern manufacturers equip their products with a built-in bubble level. This makes the task much easier.

The principle of operation of the laser rangefinder

To measure the walls using a range finder, you must first turn on the level. After that, measure the surface of the wall in height and length. From the values ​​obtained should subtract the area occupied by the windows and doorways.

The resulting numbers will help to orient in the required amount of building materials in order to avoid overspending as much as possible. For beginners, the laser range finder is a good helper.

Laser range finder with integrated visor

For ease of use in various conditions, some manufacturers equip devices with built-in cameras and sights.

But this concerns geometrically correct forms. However, the device is used in the engineering field, for example, to measure pits. There will be certain errors. By the way, the accuracy of the readings is largely influenced by the performance of the roulette itself, since at night it is higher than during the day. Therefore, additional equipment is often used in the form of a reticle or video cameras so that you can see the laser well.

To determine the distance of the object, using continuous electromagnetic radiation. The range finder can work in three modes:

  • phase;
  • pulse;
  • combined, which combines the previous two.

In the first case, the principle of action is the modulation of a sinusoidal signal, and the frequency will vary from 10 to 150 MHz.

In the second embodiment, the pulse is reflected and its periodic delay. Despite the fact that this technique is smart enough, control over it is still necessary, since failures are typical of any equipment. In order to have a correct understanding of the principle of operation of the rangefinder, the instruction manual requires careful study.

Depending on how carefully the instructions are followed, the range finder will work accurately or give inaccuracies.

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Possibilities of a laser range finder

Despite the fact that the main function of such a technique is the measurement of distances, technologies are developing. Therefore, modern models may have additional options. Some devices can measure the additional area and volume of the premises. Individual rangefinders have a function that allows you to apply the Pythagorean theorem.

Laser rangefinder at work

Laser rangefinders are used in construction, astronomy, geodesy and other areas.

Of course, the more advanced the model, the more expensive it is and the more professional you can conduct construction.

To maximize the benefits of such a device, it is worth working with large objects. Indeed, for manual calculations in this case it would take a lot of time.

The capabilities of the simplest laser rangefinder are limited to measurements in the range of 40-60 m, while more powerful models have this figure of 100 m.

Professional devices can handle up to 250 m.

The minimum distance that the range finder can handle is 5 cm.

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Dependence of technology on conditions

The range finder has two functional units: a radiation one, which includes a laser diode, and a receiver. Due to the electromagnetic wave, a laser beam is generated. The wave itself is produced by a range finder, then it is reflected from the working plane, be it the floors, walls, ceiling or other working side of the object. After this comes her return to the receiver. Each wave has its own amplitude and length. The latter indicator is initially known to the range finder, so its further calculations are made using the principle of addition of all wavelengths that have gone the way to the object and back. After that, the given amount is divided in two. And if there is a “cut off” wave, then its indicator is added on.

Comparative characteristics of several models of laser rangefinder

Comparative characteristics of several models of laser rangefinder.

The resulting figure is displayed on the display device. The measuring value, that is, meters or centimeters, is set according to personal requirements.

The range finder does an excellent job in indoor conditions, since in this case the distances have small values, and there are no interference at all. As for nature, there are several factors that can create errors in the work:

  1. The sun. Often the color of the lasers is red, so the brighter the surface, the worse the end point is visible. Why is this so important? Because the range finder must be able to process the signal, and it will be too weak, which can affect the accuracy of the readings. Therefore, in the dark, the readings of the laser rangefinder are more accurate.
  2. Pollution of the environment. The best option - if the work is carried out in the country, as the air there is more transparent. In the conditions of gas pollution or nebula, again there is a risk of errors.
  3. Reliability of fastening of a range finder. Manual measurements are always accompanied by inaccuracies. Therefore, it is better to use a special tripod for measurements. By the way, many modern devices already have such an element as standard.
  4. Working surface. If the measured plane has a dark color or a rough structure, the beam will be absorbed. Therefore, for such purposes use a bright surface, which due to the smoothness and color helps to increase the reflection coefficient.
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How to work tool on the street?

Laser rangefinder on a tripod

For ease of use, the range finder can be mounted on a tripod.

Yet in most cases, the rangefinder is used on the outside of buildings. Therefore, to maximize the accuracy of the testimony, you can use the following recommendations:

  1. It is necessary to use for such works those devices that have a range of work within 150-200 m, that is, for long distances.
  2. A target should be used. Most standard kits already have one.
  3. In order for the readings to be accurate, a tripod should be used. If this item is purchased separately, then the rangefinder must necessarily have a special socket on the bottom.

Many rangefinder models have a bracket located at the back. It can be installed at a 90-degree or 180-degree angle. If its position is perpendicular, then the device measures the distance flush with the edge or external angle.

This allows you to know the size of the diagonal of the room. In this case, the reference point is set manually, it starts from the back or front wall of the bracket. But some models are equipped with an automatic zero point transfer function.

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Proper operation

Laser range finder in a case

For easy storage, laser rangefinders are equipped with special covers.

Since the wavelength is 635 nm, the human eye sees a red beam. Therefore, working with such a device, you should be careful. Getting into the eye, such a beam can have a devastating effect. It all depends on the class of laser used: the higher it is, the more dangerous the contact of the beam and the eye. According to the standard range finders have a beam with a second class of radiation. This, in turn, means that with a short-term exposure before a person’s eyes a brief period of light will flash. But if the beam will act directly and for a long time, the consequences can become extremely unpleasant.

A range finder is a device that requires batteries to operate. After their charge is over (about 5-10 thousand measuring processes), they should be disposed of properly. If the contents of the battery leaks inside the device, this can lead to a breakdown of the device, which clearly requires costly repairs. Therefore, before and after each use of the battery should be carefully inspected.

Such a device requires a delicate treatment, so for it is not allowed exposure to physical force, and especially fall. It is also fraught with repair or even purchase of new equipment.

To have such a device at hand is to significantly improve their working conditions. First, the need to perform calculations in the mind disappears - the technique does everything. Secondly, it saves a lot of time, especially if the range finder is a new modification, since it has many additional functions. Thirdly, automatic data saving helps not to bother with a large number of digits, which is also extremely convenient.

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