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Some differences between ultrasonic rangefinder and laser rangefinder are introduced
The principle of laser rangefinder is the same as radio radar. After laser alignment is sent out, measure its reciprocating time, and then multiply by the speed of light to get reciprocating interval.Because the laser has the high direction, the high monochromatism and the high power and so on the merit, these about measures the distance interval, the determination policy azimuth, the enhancement accepts the system the signal to noise ratio, guarantees the measurement precision and so on is very key, therefore the laser ranging receives the attention day by day.
The laser radar developed on the basis of the laser rangefinder can not only measure distance, but also can measure the orientation, the speed and acceleration, has been successfully used in the ranging and tracking of artificial satellites, such as the selection of ruby laser laser radar, ranging scale of 500 ~ 2000 km, the error of only a few meters.At present, ruby laser, neodymium glass laser, carbon dioxide laser and gallium arsenide laser are often used as the light source of laser rangefinder.
Ultrasonic sensors are often used to detect distant objects, and because they are not optical devices, they are unaffected by color changes.However, ultrasonic sensors measure the interval according to the speed of sound, so there are some inherent defects that cannot be used in the following situations, while laser sensors do not have the following problems:
(1) when the policy to be tested is not in line with the transducer of the sensor.Because the ultrasonic inspection policy must be in the sensor with a deviation of no more than 10° Angle.
(2) occasions where visible light spots are required for location calibration.
(3) occasions where the required beam diameter is small.Generally, the diameter of ultrasonic beam is 0.76cm when it is 2m away from the sensor.
(4) windy occasions.
(5) vacuum occasions.
(6) large temperature gradient occasion.Because in this case there is a change in the speed of sound.
(7) occasions for rapid response of demand.
What is the development prospect of laser rangefinder in China?
As the world's factory, laser rangefinder industry has a good prospect and potential. Since the 21st century, China's laser market has shown a steady and rapid growth trend.Despite the rapid development of the industry, we should be aware that China's laser industry started late, the foundation is weak, and the gap with the world's major countries is still large. For example, China's laser processing systems are quite different from those made in advanced countries.It accounts for only about 2% of global sales.Mainly reflected in: high-end laser processing system less, uneven;The laser of the main component of the laser rangefinder is not closed;There is a big gap in laser micromachining equipment.
Major problems remain:
There are fewer core technologies: many of the key infrastructure technologies have not been solved, and some technologies have even regressed.At present, most of the core technologies of domestic laser rangefinder are imported, and the competitiveness of the products is insufficient.
The combination of product research and development is not satisfactory: China still leads the world in academic research on laser rangefinders, but the industry is very backward, intellectual property rights and patent results are not well protected, and many advanced laser technologies have not been translated into industrial applications.In addition, academic openness is not enough, and innovation is inefficient due to the fear of technological loss.
Weak innovation ability, poor support ability: the system support ability is not high, the innovation ability is insufficient, mostly is the traditional structure type.At present, most industries are integrated industries of optical machinery and electronic computing, and the combination of domestic laser and other industries is very bad, low degree of intelligence and automation, which increases the difficulty of users.
From a technical management perspective, there is a lack of a good evaluation system: there are no national standards, the evaluation system "equivalence" conversion is improper, not flashy.The existing evaluation system is a kind of self-cycle, which leads to the insufficient quality supervision of laser products and is not conducive to the development of laser industry.