Metro led the development of new sensor technology

Metro led the development of new sensor technology




With the rapid development of semiconductor technology, in a modern advanced city subway, light rail vehicles, traction control system and auxiliary power supply system, are used in the way VVVF VVVF power inverter and the CVCF auxiliary power inverter. And Route AC - Straight - AC drive locomotive, as current sensors and voltage sensors are also used in the above-mentioned system, a large number of DC and AC loop, in order to achieve closed-loop control of the whole system.



However, the urban rail traffic on sensor technology to promote the biggest lies in wireless sensor network technology, infrared sensor technology, force sensors, gas sensors, speed sensors and photoelectric sensors and other new sensors, rather than current sensors and voltage sensors and other traditional sensor field. China Railway Electrification Survey Design & Research Institute Co., Ltd., deputy chief engineer, senior engineer and chief of international co-operation project management expert Wang pointed out that "in the metro area, with the ventilation and air conditioning-related, such as temperature and humidity and CO2 sensors, and prevent terrorism on a number of toxic gases sensors have a high demand and technological content.



The field of high-speed EMUs on the inside and closed the amount of oxygen monitoring and supply, earthquakes, speed monitoring, Hotbox testing, joints loose monitoring of foreign bodies and other related sensors to monitor the demand is very high, these technologies are still evolving and perfected. The anti-theft robbed class sensors, such as broken glass, high-pressure chamber, incorrect access, and cable raiding sensors are very important. "Wang co-operation further pointed out that these sensors and systems equipment and personal security are closely related.



In urban rail transit vehicles, air-conditioning systems often use sensors and electronic temperature control thermostat compatible. Multi-use electronic thermostat regulator, sensors for temperature detection, commonly used for thermocouple or thermistor sensors. In the guest room, because of people's breath, carbon dioxide (CO2) levels will increase, when up to a certain concentration, can affect human health, the belongings of passengers in the car produced harmful gases also make the air inside the vehicle become polluted, requiring the world a fresh air to the car to a certain degree of replacement of the air, so the precise detection of the gas sensor becomes particularly important.



Since January 2005 the United States Washington, DC, the opening of a two subway stations to detect the chemical gas sensors began, more and more subway station began using sensing detection technology to ensure the safe operation of rail transportation. 2008 Beijing Olympic Games, the country's many cities are set rail each site should be mandatory placement of explosives and toxic and hazardous hazardous chemicals detection sensors. And because wireless sensor network includes detectable, including earthquakes, electromagnetic, temperature, humidity, noise, light intensity, pressure, soil composition, moving objects, the size, speed and direction, and many other types of sensors, so as to ensure rail safety system The main sensor technology.



Wireless sensor networks are hot spots of contemporary science and technology is one of the difficulties, the wireless sensor network consists of randomly laid a large number of multi-species sensor nodes that can expedite the formation of adaptive network topology structure, distributed dynamic information for collaborative sensing and processing, the formation of incomplete, limited self-government integrated information system, remote human nerve endings. Shanghai Micro-system in wireless sensor networks, MEMS sensors, chips, nodes, networks, co-processing, etc. overcome a number of key technologies and prototype, in random laid networking, a variety of sub-cluster networking, network system architecture, a variety of communication system, the virtual MIMO and achieved remarkable progress. In the sensor network, blind source separation, multi-target collaboration to identify, track the location of some of the key technology areas such as the world's advanced level, and for the major national needs, to be a certain amount of important applications.



Sensors in ensuring safety on the track Another important application is the PSD, in the past there have been many times the passenger caught in the door between the PSD and train accidents, and now a growing number of rail transit station is being installed or plan to install the infrared sensors or optical sensors, to prevent passengers become "sandwiched."



State rail transit construction investment will further promote the vigorous development of sensor market, in addition to the above-mentioned sensors, also includes a machine vision sensors, as the rail construction, the highest underground construction equipment, shield machine sensors.



Sensor market in the further development, a growing number of sensor manufacturers to join the market competition in the past. As sensors market demand, manufacturers can keep traction, and continuously expand their business blue ocean, to improve their technological capabilities, will become a breakthrough for some time to develop the key.



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