The better visibility in cloudy and nightfall
· Bak4 roof prism
· Soft ABS spray-paint covered for shock protection
· Three modes: Rain Mode, High Reflection Object Mode and Long Range Mode
· Focus adjustment at eyepiece lens
· With free lens cleaning cloth, nylon belt holsterand hand sling
· Vector Optics and made in China under our strict quality control
What is the measuring principle of laser rangefinder?
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.
How to ensure the precision of laser rangefinder?
Today, laser range finders of a wide range of functions, but from the operation mode (or operation principle) can be seen only two, namely: pulse laser ranging and continuous wave laser ranging.The principles and characteristics of the two rangefinders are described below:
The principle of pulsed laser ranging is that a series of very narrow light pulses (pulse width is less than 50ns) are transmitted to the policy by pulsed laser, the light reaches the policy surface and is partially reflected, and the interval between the rangefinder and the policy can be calculated by measuring the moment when the light pulse is transmitted to the receiver. Assuming the measured interval is h, the reciprocating moment of light pulse is t, and the propagation velocity of light in the air is c, then: h=ct/2
Pulsed laser rangefinders emit very strong lasers.The range finding ability is strong, even for non-cooperative policy, the maximum range can reach more than 30000m.Its ranging accuracy is generally 5 meters, the highest up to 0.15m.Pulsed laser rangefinders can be used for ranging from military to non-cooperative ranges, to climate measurements of visibility and cloud heights, and to fine interval measurements of satellites.
Successive wave laser rangefinder usually adopt ranging based on the phase method and its principle is to approach first launched a beam of laser beam through modulation of successive waves, after arriving at the policy on the surface of the beam is reflected, after the launch of the modulation measurement of the phase difference between the laser beam with the receiver to receive the echo can be concluded that policy and the gap between the rangefinder.