One of the practical, accurate tools is the easy-to-use laser meter / laser rangefinder, which can be used to measure distance, align and match by using the travel time of a laser pulse to the target. Due to the reduction of human error, increase of work speed and increase of accuracy, laser meters are very widely used.
Depending on the type of application, different laser meters are used in construction operations, military applications (anti-missile, range and weapons guidance), sub-ocean (depth measurement), industrial production processes (warehouse process management systems in the steel industry) Laser meters and laser rangefinders can be used.
How laser meters work
Laser meters send a laser pulse to the target and hit it on the target and return it to the relevant measuring device. The flight time or return time of this pulse is based on the principle that the speed of light on the ground is almost constant, the basis of size. Is taking. Inside the device, a small computer calculates the distance based on flight time and light speed. This calculation method can calculate the distance from the earth to the moon with an error of a few centimeters.
Calculate the distance
The distance between the laser meter and the target is calculated by the formula D = ct / 2. Where t is the flight time and c is the speed of light. Due to the high speed of light and the resulting pulse sent by the device, the measurement accuracy is very high.
Laser meter applications
The most important application of laser is distance measurement, leveling and matching, which is used depending on the type of application in various industries such as construction and surveying, industrial production processes, military industries, etc.
The most important applications of laser meters inside the building can be mentioned as follows:
• Installing and leveling all kinds of frames, frames and columns
• Installation of cabinets, shelves and toilets
• Install wallpaper and stencils
• Types of interior decoration operations
• Installation of drywall, partitions and false walls
• Installation and alignment of doors and windows
• False ceilings and floors and rabbits
• Construction and installation of panels, molds, frames and cabinets
• Installation and connection of devices to the wall, such as: machines, photos, posters, etc.
• Worn tissue reconstruction projects
• Installation of electrical connections, switches and sockets, chandeliers and ceiling lights
• Supervising and controlling the performance of construction project contractors
The purpose of using a laser meter / laser rangefinder
• Minimize human error
• Significant increase in work speed
• Operation accuracy
• Avoid rework and unnecessary use of construction materials
• Reduce implementation costs and manpower
• The light weight of the device and its price and very low complexity
The reason for using lasers
Laser light is a highly focused, intense, and usually single-frequency spectrum. This light acts to measure very accurately, because they move at a very constant speed in the atmosphere. It also takes longer for this diffused light to dim, which increases measurement accuracy. Also, laser light is scattered later than white light, so it can be irradiated at a longer distance. Compared to white light, laser light retains its intensity over long distances, which is very important for measuring distances.
The factors that lead to errors in laser meters are:
In some cases, the laser beam expands and propagates over long distances as a result of divergence, due to its proximity to air bubbles that act as a lens that changes in microscopic size to about half the height of the laser beam above the ground. Are being created.
These atmospheric perturbations combine with the scattering of the laser itself and with intersecting rings, which cause hot bubbles to be compressed laterally, which may combine to make it difficult to read the distance of an object, e.g. Under some trees or behind bushes and foliage or even at long distances of more than 10 km in the open and in very dark areas.
Some laser lights may be returned to the object from closer foliage, causing them to bounce back quickly and read less accurately. Instead, at distances greater than 365 meters, the target may easily be in a The mirage disappears, which is caused by temperature changes in the air near the hot desert, which causes the laser light to bend.
Different objects also reflect light with varying intensity. Materials that tend to absorb or scatter light reduce the likelihood that light will return to the transmitter. In this case, a device with the possibility of “phase shift” must be used.