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motion sensor for a wide range of applications

19.07.2007

STMicroelectronics has expanded its line of motion sensors with a new two-axis linear accelerometer with a digital output. The L1S202DL is a micro power miniature sensor with intelligent functions, designed for wide use in both household appliances and industrial applications. The accelerometer possesses intellectual and capabilities thanks to the integrated circuit built into the sensor and the high-frequency filter, which allows you to react and distinguish between the impact - single or double touch, determine movement (movement, lifting). LIS202DL allows, for example, to turn off the phone ringing in your pocket without taking it out - with one touch of your hand.

Adjustable high-pass filters can be configured to monitor vibration or activate desired device functions through movement. The possibility of implementing the specified functions by external influence does not depend on the position of the object under study at the time of measurements. An ST sensor with built-in motion detection can be used to shut off power to a device that may turn on or off after movement (such as a remote control).

The digital output implemented as standard SPI/PC interfaces (selectable) makes the sensor efficient to use and easy to integrate into the system. The LIS202DL is housed in a miniature 5x3x0,9mm plastic case that can be placed almost anywhere limited by small dimensions.

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Supersonic train project 23.08.2013

SpaceX CEO Elon Musk unveiled a project for a Hyperloop bullet train that will move in a tunnel with rarefied air.

The new train will be able to accelerate to speeds of over 1100 km/h, while perfect aerodynamics and a rarefied air tunnel will reduce the resistance to movement so much that only 134 hp will be needed to maintain supersonic speed. (100 kW), the resistance force in this case will be only 320 newtons. To achieve these characteristics, new technologies are used that turn the Hyperloop into a completely new type of transport.

The train will be accelerated using a magnetic field, while the stators are planned to be placed in the tunnel, and the rotors on the passenger capsule car. A distance of 2 cm will be maintained between these parts throughout the entire journey, and the train itself will be separated from the walls of the tunnel by an air cushion. The pressure in the tunnel will be very low, about 100 Pa (as at an altitude of 45 km) - this is necessary to reduce drag. However, even this low pressure creates too much drag at supersonic speeds - the train, like a syringe piston, will move all the air in the tunnel in front of it and suck in the air behind. To solve this problem, a fan will be installed in the nose of the train, pumping air from the bow of the train to the stern and creating an air cushion that replaces the wheels of the train. The tunnels will be located on concrete supports equipped with a seismic activity compensation system.

The passenger capsule is planned to be made in two versions: for the transportation of people and for the transportation of people and cars. The time interval between departures of passenger capsules should be no more than 2 minutes. One 2,5-ton passenger capsule will be able to carry at least 28 passengers, and the maximum overload on the route will not exceed 1 g. Thus, on the route Los Angeles - San Francisco Hyperloop will be able to carry 840 passengers per hour. The train will be able to cover a distance of 550 km in just 35 minutes, which is faster than a modern airliner, especially considering the time it takes for the aircraft to prepare for departure and its dependence on weather conditions.

The safety of the train is ensured by a number of "smart" systems that stop the passenger capsule in the event of a dangerous depressurization of the cabin or tunnel. Even if the external power is completely cut off, the fan at the front of the train will continue to operate and maintain the air cushion, since it is powered by batteries located at the rear of the train. Perhaps the heavy fan in the nose of the train and the battery in the tail are the only controversial point - the passenger compartment in the event of an impact could be between a "hammer and a hard place."

The cost of the Hyperloop project at first glance is high, but in fact, Elon Musk offers a really inexpensive mode of transport. Thus, the cost of a passenger capsule is estimated at only $255, and the cost of the entire 550-km road - at $6 billion, or about $11 million per 1 km of the road, plus the passenger capsules themselves. For comparison, 1 km of the much slower prospective Moscow-Kazan railway is now valued at more than $34 million (excluding train costs). At the same time, the planned cost of a ticket for the Hyperloop train will be about $20 - several times lower than for the Sapsan.

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