? Radar speed measurement application and basic principles
application
In traffic engineering, speed is one of the most important data for measuring and assessing road performance and traffic conditions. There are many methods for collecting speed data, including manual measurement of fixed distance travel time, pressure tube method, coil method, image processing method, radar speed measurement method and laser speed measurement method. The latter two are widely used and are highly accurate, and are therefore widely used.
Speeding traffic accounts for a large proportion of traffic violations. This phenomenon can be seen from the violation of the highway in the past four years. The proportion of speeding cases is about two-thirds, and speeding has always been considered an important issue. One of the factors; therefore, from the perspective of traffic enforcement, the elimination of the speeding system is a more specific means of maintaining traffic safety. Domestic banned violations of speeding have always used radar speed guns as tools, and road shooting cases are supplemented by photographic equipment; only in recent years, radar detectors are prevalent, and after the price is popularized, even if the regulations are banned, the general public is still eager because of The price can be completely recovered by simply escaping the opportunity of one or two bans. From the point of view of traffic engineering, if a driver is equipped with a radar detector, the speed measured by the fixed point on the roadside will be perceived by the driver as being measured, and the police officer will be banned by the police. In addition to distortion, and thus have the possibility of causing an accident.
Folding and editing the basic principles of this paragraph
A radar is a device that uses radio echoes to detect the direction and distance of a target. The radar is the transliteration of the word Radar in English. The word is abbreviated by the prefixes of Radio Detection And Ranging. It is the meaning of radio exploration and ranging. The world began to become familiar with radar. In the 1940 British Air War, 700 British fighters carrying radars defeated two thousand German bombers, thus rewriting history. After the Second World War, the radar began to have many peaceful uses. It can be used to detect storms in terms of weather forecasting; it can help pilots and airport air traffic controllers perform their tasks more efficiently in terms of aircraft navigation safety.
The principle of radar operation is very similar to that of sound waves. The only difference is that the wave used is a very high frequency radio wave, not sound waves. The radar transmitter is equivalent to the sound of the shouting sound, and emits a pulse similar to the shouting sound. The pointing antenna of the radar is like a microphone, so that the energy of the electric pulse can be concentrated in one direction. The receiver acts like a human ear to receive echoes of electrical pulses emitted by the radar transmitter.
The English word for laser is Laser, which is abbreviated by the first letter of Light Amplification by Stimulated Emission of Radiation, which means that the amplification of light is achieved by excitation radiation. The light excited by the laser has the same photon size and direction of motion, so each beam has the same frequency, and the bundles are closely arranged, parallel to each other, so that the entire beam is emitted. It will not spread out to the extreme. In the 1962 experiment, it was discovered that after the nearly 400,000-kilometer space journey, the laser emitted from the Earth only projected a circle of about three kilometers in diameter on the surface of the moon! This feature makes the laser welding. Processing, cutting, engraving, and piercing are more widely used in medicine (ophthalmology, dentistry, and tumor).
The speed laser is a type of semiconductor laser in solid state laser. The laser speed measuring device uses an infrared semiconductor laser diode. The laser diode has several features that make it ideal for measuring speed:
1. The laser diode emits a very narrow beam from a small range, and this narrow beam can accurately aim at the target.
2. The laser diode switches the switch at an instant of less than one billionth of a second, which greatly improves the accuracy.
3. The laser diode has a very low emissivity, and its detector is very easy to receive precise wavelengths; therefore, it can still operate normally when there is strong sunlight during the day. 4. The laser diode emits only the infrared portion of the electromagnetic spectrum; while the infrared system is invisible to the eye, it does not affect the driver's attention. The laser speed gun measures the speed of the infrared light wave transmission time. Since the speed of light is fixed, the time that the laser pulse is transmitted to the target and then folded back is proportional to the distance. By transmitting two pulses at regular intervals, two distances can be measured; dividing the difference between the two distances by the transmission time interval yields the target velocity. In theory, two pulses can be measured to measure the speed; in practice, in order to avoid errors, the general laser speed detector (gun) emits up to seven groups of pulse waves in an instant, and the average value is obtained by the least square method to calculate the target speed. .
Radar speed measurement has so many uses. In normal production life, we can use Meihuayi's handheld radar speedometer MHY-27741 for high-efficiency speed measurement.
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