Flight Time: The time spent on a pulse of light to travel back and forth to the target. By knowing the speed of light and accurately measuring the time spent, the distance is calculated. A large number of pulses are thrown in a row, which is usually the average response used. This method requires a very precise circuit with a sub-nanosecond timing.
Multi-frequency phase transmission: This method is transmission Phase Measures multiple recursive frequencies and then solves several simultaneous equations for the final measurement.
Interference: The most accurate and useful technique for measuring distance changes relative to absolute distances.
Image: A high-range rangefinder that can measure a distance of 20 km and is mounted on a tripod with a triangular base. This device also supports arched and up and down movements.
Laser rangefinder It is a device that uses a laser beam to determine the distance of objects. The most common type of laser rangefinder is based on the flight time of the sample by sending a laser pulse in a beam to the object and measuring the time it takes for the beam to be reflected from the target. Returns to the sender. Due to the high speed of light, this technique is not suitable for measurements with an accuracy of less than a millimeter, so often three angles and other methods are used.
Laser rangefinders work on the same principles as conventional radars. A YAG or CO2 laser pulse is sent to the target. The transmitted pulse then returns to the hit target and is then received by a suitable receiver system Optical becomes obvious. The desired distance is obtained by determining the time it takes for the sent pulse to travel back and forth. The outline of a Nd: YAG rangefinder consists of a transmitter (laser), a receiver, and a camera. By sending a pulse to the target, the light scattered from the target by the L1 and L2 lenses is focused on a detector and an electrical signal is generated. If at laser point t0 a laser pulse is sent from the system to the target and the return signal is detected at moment t1, given that light travels 2x (signal return) at speed C at time t1 – t0, x is obtained. May:
(X = (1/2) C (t1 – t0
It is observed that the accuracy in determining the distance depends on the accuracy in determining the time. Military systems appear numerically on the device by counting the oscillations of a quartz crystal in time t1 – t0
Distance detection lasers are usually used for military purposes. Lasers are now used as anti-missile, range, and weapon guidance. Fighter aircraft must be at low altitudes and with to be protected from laser-equipped defensesSpeedThey move a lot, so the pilot may only be careful for a few seconds to find the target, aim and drop his ammunition. With a good laser, this can be done almost instantly by measuring the time interval between turning on the laser and detecting scattered return radiation from the target. Therefore, even at very high speeds in modern aircraft, if the laser is well cooled, the distance measurement can be done 10 to 20 times per second. Therefore, they provide enough information to the pilot or computer
Applications of laser rangefinder
This scanner (LIDAR) can be used to scan buildings, stone structures and… to produce a 3D model. LIDAR can direct its laser beam over a wide range: its head rotates horizontally, a vertical mirror moves. The laser beam is used to measure the distance to the first object in its path.
This scanner (LIDAR) can be used to scan buildings, stone structures and… to produce a three-dimensional model. LIDAR can direct its laser beam over a wide range: its head rotates horizontally, a vertical mirror moves. The laser beam is used to measure the distance to the first object in its path.
Laser rangefinders are widely used in the identification and modeling of three-dimensional objects and many types of strings related to computer virtual images. This technology forms the heart of three-dimensional time-of-flight scanners. Compared to the military instruments described above, laser rangefinders have high-precision scanning capabilities with modes Provide a 360-degree aspect or scan.
A number of algorithms have been developed to adapt the range of data received from different angles of an object to produce complete 3D models with the least possible error. One of the advantages of laser rangefinders over other imaging methods Virtual computer has that the computer does not need to link the properties of two images to determine depth information (such as projection techniques).
Laser rangefinders used in computer imaging applications typically have a depth resolution of one-tenth of a millimeter or less.
Laser rangefinders can be used effectively in a variety of sports that require accurate distance measurement, such as golf, hunting, and shooting.
Industrial production processes
One of the important applications is the use of laser rangefinder technology in length automation Warehouse management systems and production processes in the steel industry.
Laser measuring tool
Laser rangefinders can also be used instead of meters in several industries such as construction, renovation and real estate. Laser measuring device can do this with one person and only with the need for one path of vision. Laser measuring instruments typically have the ability to produce some calculations such as the area or volume of a room.
Laser rangefinders are first-class laser devices for customers and therefore safe for the eye. Some laser rangefinders exceed Class One energy levels for military use.
The light weight of the device and its price and complexity are much less than ordinary radars
The working power of the device in not very favorable conditions, even when the target is moving above the water surface or on the ground.
The disadvantage of laser rangefinders is that the application of the device ensures direct vision and the laser beam is strongly absorbed in the environment in unfavorable conditions. The rangefinders used with a range of up to approximately 15 km are:
1- Manual rangefinders with a maximum range of 10 Km and an accuracy of less than 10m
2-Detectors that are mounted on the tank
3 – Anti-aircraft rangefinders
An excellent application of the application of laser technology
An excellent example of the application of laser technology in the technique of using electrical and automated devices in military aviation. R. T. S (Laser Finder Target Finder and Target)
Laser Ranger Marked Target Seeker is to R. ا. F (Royal Air Force) Delivered by Ferranti Limited. This system has a very important and additional feature, and that is that a target such as a tank, car or building can be identified by a soldier on the ground with a neodymium laser and a binoculars placed in a portable box called a ground marker.
Looking into the eye, the soldier sees a magnified image of a place on which a set of orthogonal lines is stacked, identifying the exact point at which the laser is being aimed. Of course, the laser mole itself is invisible. There is a rotating platform on the aircraft with a reflecting telescope mounted out of a window at the tip of the aircraft. The telescope receives scattered (returned) laser light from the ground signal through the target. The telescope has a special detector that is clearly sensitive, and the resulting signals are used to point the telescope directly at the target.
Thus, by centralizing the target image, the telescope continues to target the target regardless of the target or aircraft. Coaxial with the aircraft search system, there is a laser detector equipped with a water-glycol-cooled neodymium laser, which automatically turns on as soon as the target is found by the searcher. Attached to the weapon, which is located outside the aircraft, informs. There is a sign plate above the pilot’s head to indicate the target position, and handles are mounted to form the weapon. In this way, the pilot can fly on the signage page to perform combat missions against the sign, and there is no need to see the main target behind the sign.
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