Google's unmanned aerial vehicle uses more than 150 laser sensors from Velodyne, one of the most energetic labs in the world - one of Google's projects. The plan aims to achieve a more secure autopilot vision through the car's built-in ultra-precision navigation, sensing and other technologies. Google unmanned car project director Chris Urmson said in an interview, want to really open such a car, at least 6 years of research and development time. Google said it has been with some large car manufacturers to contact, to discuss the cooperation Sensor of unmanned vehicles. With more than 150 laser sensors from Velodyne in the Google Unmanned Car, the car will remain priced for a long time. With the large-scale sales, Google unmanned car prices will eventually become reasonable.
Its automatic driving car technology testing work has made significant progress. Google Autopilot has completed a 700,000-mile driving test, which includes not only a freeway driving test without traffic lights, but also a large number of suburban street driving tests with a lot of ground conditions.
Traveling one mile in the city is much more complicated than on the freeway because the former has hundreds of different road conditions in a small area because of the different rules. It can now distinguish hundreds of different objects in real time - such as pedestrians, buses, parking signs held by co-managers, or gestures that are given by cyclists. Automatically driving Suction Control Valve a car can usually take all the above road conditions in a way that can not be done by humans, and it will never be distracted or feel tired.
All along, Google has been carrying a lot of publicity on the social burden of automatic driving car technology. The company hopes to persuade the public, regulators and insurance companies - autopilot car technology is trustworthy in terms of safety and convenience. Automatically driving the car to liberate the hands of the driver, which helps them in the future driving process to achieve the watch video, check e-mail, update the social network status, or carry out any Internet operation - Google as an Internet company, this or One of its most immediate benefits.
Although many people can not wait to see the arrival of the era of automatic driving the car, but some people do not want to easily give up control of the car, do not even believe in the reliability of technology, in addition to some people do not want to Technology to pay an additional fee. But Google and its automatic driving technology will eventually win the market. The rate of traffic accidents Fuel Rail Pressure Sensor in autopilot cars will tend to zero, although other vehicles are likely to hit autopilot cars, but with the latter in the market share of the proportion of rising, the total accident rate will be steady Down. Traffic congestion and air pollution can also improve because of the advent of autopilot cars because they can be programmed to travel in the most efficient and energy efficient mode. Nissan, General Motors and the German mainland group are expected to automatically drive the car to be in 2020 will be officially on the road.
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The laser sensor consists of a laser, a laser detector and a measuring circuit. Laser sensor is a new type of measuring instruments, its advantage is to achieve non-contact long-range measurement, fast, high precision, large range, anti-light, strong electrical interference and so on. When the laser sensor is in operation, the laser emission diode is first aligned with the target laser pulse. After the target reflection, the laser is scattered in all directions. Part of the scattered light back to the sensor receiver, the optical system is received after the imaging to the avalanche photodiode. The avalanche photodiode is an optical sensor with an internal magnification, so it can detect extremely weak optical signals Temperature Sensor and convert them into corresponding electrical signals. Commonly, the laser ranging sensor can measure the target distance by recording and processing the time elapsed from the light pulse to the return received.
The use of high-direction laser, high monochrome and high brightness and other characteristics can be achieved without contact with long-range measurements. Laser sensors commonly used in length, distance, vibration, speed, azimuth and other physical measurement, can also be used for testing and monitoring of air pollutants. Precision measurement of length is the precision machinery manufacturing industry and optical processing industry, one of the key technologies. Modern length measurement is the use of light interference phenomenon to carry out, and its accuracy depends mainly on the light monochromatic good or bad. Laser is the ideal light source, it is better than the previous monochromatic light source (krypton-86 light) is still pure 100,000 times. So the laser length measurement range, high precision.
Laser ranging principle and the same as the radio radar, the laser aimed at the target launch, the measurement of its round-trip time, and then multiplied by the speed of light that is round-trip distance. As the laser has high direction, high monochrome and high power and other advantages, which for measuring the distance, determine the target position, improve the receiver system signal to noise ratio, to ensure measurement accuracy are very critical, so the laser range finder Increasing attention. In the laser range finder developed on the basis of the lidar can not only ranging, but also can measure the target orientation, transport speed and acceleration, has been successfully used for satellite range and tracking.
The vibration velocity of an object is measured based on the Doppler principle. Doppler principle is that if the wave source or the observer of the received wave moves relative to the medium of the propagating wave, the frequency measured by the observer depends not only on the vibrational frequency of the wave source but also Pressure Switch on the motion of the wave source or observer The size and direction of the speed. The difference between the measured frequency and the frequency of the wave source is called Doppler shift.
Laser Velocimetry is also a laser-based method of the principle of the base Doppler. It uses a laser Doppler flowmeter (see the laser flowmeter) that measures the wind speed of the wind tunnel, the fuel flow rate of the rocket, the jet flow rate of the jet , Atmospheric wind speed and chemical reaction in the particle size and convergence speed.