Laser meter UT391 PLUS UNI-T

A laser spacer is a device that uses a laser beam to determine the distance of objects. The most common type of laser spacer is based on the time of flight of the sample by sending a laser pulse to a beam beam to the object and measuring the time taken by the beam to reach the target. Reflects and returns to the transmitter. Because of the high speed of light, this technique is not suitable for precision measurements of less than a millimeter, as most three angles and other methods are often used.
The laser spacer is based on the same principles used in conventional radars. A YAG or CO2 laser pulse is sent to the target that has been hit. The pulse then returns to the target and is then detected by a suitable optical receiver system. The desired distance is obtained by specifying the length of time it takes the pulse to travel through the roundabout. The outline of an Nd: YAG rangefinder consists of a transmitter, a receiver, and a camera. Then, by sending the pulse to the target, scattered light from the target by the L1 and L2 lenses focuses on a detector and an electrical signal. If the moment t0 of the laser pulse is sent from the system to the target and the return signal is detected at the moment t1, given that light at speed C has traveled 2x the distance traveled in time t1 - t0, the distance x is comes:
(X = (1/2) C (t1 - t0
It can be seen 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 over the time interval t1 - t0.
USNT + UT391 Laser Meter 60 m distance measurement. The UNI-T brand is one of the few brands in the world to have a very good price tag in its products, this laser meter has the ability to subtract, calculate volume and area, measure Pythagoras, measure distance between two laser points, Display of minimum and maximum measured values ​​is equipped with a bubble level feature of this device.