What do we usually use to measure distance? Many people naturally answer that they use rulers! But in fact, we can often see that most people who need professional distance measurement no longer use such primitive tools as rulers. Instead, they use handheld laser rangefinders!
When you are decorating your home, you may see a decorator holding an instrument the size of a mobile phone. By pressing it against the wall, you can know the distance between the walls. The small instrument they use is a handheld laser rangefinder.
Why is a handheld laser rangefinder so convenient? In fact, the principle is very simple. When working, the laser rangefinder shoots a very thin laser beam at the target. The photoelectric element receives the laser beam reflected by the target. The timer measures the time from the laser beam from emission to reception, and calculates the distance from the observer to the target. This is a very common pulse method to measure the distance.
Another way to measure distance is the phase method. The phase laser rangefinder uses the frequency of the radio band to modulate the laser beam and measure the phase delay caused by the modulated light going back and forth once. Then, according to the wavelength of the modulated light, the distance represented by this phase delay is converted. That is, the time required for the light to go back and forth through the measuring line is determined indirectly. Phase laser rangefinders are generally used in precision distance measurement.
The distances that can be measured by general handheld laser rangefinders are usually 40 meters, 60 meters, 80 meters, 120 meters, 160 meters, and 200 meters. However, if you want to measure longer distances, you need to use a telescope laser rangefinder. This rangefinder measures a long distance, but the accuracy is relatively low. It is mainly suitable for long-distance measurement in the field.
Can laser rangefinders only measure distance? Of course, it is more than that. Most handheld laser rangefinders now have multiple measurement modes. You can adjust the measurement mode to measure length, area, volume, and Pythagorean measurements, and the desired data will be automatically calculated.
No matter what you measure, the problem of accuracy cannot be ignored. There is no doubt that the accuracy of the laser rangefinder is incomparable to the traditional ruler measurement. The accuracy of the handheld laser rangefinder can even reach the millimeter level. What is this concept? Take the onick 20000CI series as an example. Its measurement accuracy is expressed as "1.5mm±d*0.5 ten thousandths". So when measuring a distance of 40 meters, its measurement error is only ±3.5mm. Surprising or not!
The handheld laser rangefinder is small in size, light in weight, simple to operate, fast in response speed, and accurate in measurement. These advantages make it invincible in indoor distance measurement work, but there is also a small limitation. When the handheld laser rangefinder is measured outdoors, due to the influence of outdoor light pollution, the measurement accuracy may drop significantly. Therefore, if the user needs to measure in an outdoor environment, it is recommended to use a professional laser sight and a reflector to achieve the desired effect.