A laser rangefinder is an instrument that USES a laser to accurately measure the distance between policies.The laser rangefinder shoots a very fine laser rangefinder light to the target when it is operating. The laser beam reflected by the acceptance target of the photoelectric element is measured by the timer. The timer measures the time of the laser beam from emission to acceptance and calculates the interval between the observer and the target. If the laser is continuously launched, the range can be up to about 40 km, lined with fluorine butterfly valve and can be operated day and night.If the laser is pulse emission, the general accuracy is certainly low, but used for distant interval quantity, can reach a very good relative accuracy.The world's first laser was first developed in 1960 by hughes aircraft company scientist maiman.
The U.S. military soon began a study of military laser equipment based on this.In 1961, the first military laser rangefinder passed the U.S. military's certified test, and soon after that the laser rangefinder entered a useful combination. Laser rangefinder heavy weight, small volume, simple operation, fast and accurate, its error is only one 5 of other optical rangefinder to one percent, and therefore is widely used in terrain measurement, field measurement, tanks, planes, ships and artillery range of policies, measurement of clouds, the height of the aircraft, missiles and satellites, etc. It is an important technical equipment to improve the precision of high tanks, aircraft, ships and artillery.Because the price of laser rangefinders continues to fall, the industry has gradually begun to use laser rangefinders.A number of new micro rangefinders with the advantages of fast ranging, small size and reliable function have appeared at home and abroad, which can be widely used in industrial measurement and control, mining, port and other fields.The primary classification of one-dimensional laser rangefinder used for interval measurement and location;Scanning Laser Rangefinder (2d) is used in Scanning Laser Rangefinder for general measurement, positioning, regional monitoring and other fields.3D Laser Rangefinder (3D Laser Rangefinder) is used in the fields of 3D general measurement and 3D spatial positioning.
1. Must the plane of the subject be straight with the light?
General precision ranging needs total reflection prism, and the house measurement with the rangefinder, directly with the lubrication of the wall reflection measurement, the first is because the interval is relatively close, light reflection back signal strength is large enough.This can be known, must be straight, otherwise the return signal is too weak to get the exact spacing.
2. What is the principle of infrared ranging or laser ranging?
The ranging principle can be basically summed up as measuring the time required for the round-trip policy of light, and then calculating the interval D by the light velocity c =299792458m/s and the atmospheric refraction coefficient n.Because it is difficult to measure time directly, the phase of continuous wave is usually measured.Of course, there is also a pulse rangefinder, which is typical of WILD di-3000. Please note that the phase measurement is not to measure the phase of the infrared or laser, but to measure the modulation of the signal phase above the infrared or laser.The construction industry has a hand-held laser rangefinder for measuring houses that works on the same principle.
3. If the plane of the measured object is diffuse reflection, is it possible?
It is generally possible to use thin plastic sheets as reflective surfaces in practical projects to deal with serious diffuse reflection problems.