The "geomagnetic sensor" is not only a "geomagnetic sensor", but the "geomagnetic sensor" works when the driver parks the vehicle in the parking space. The "geomagnetic sensor" will automatically sense the parking time of the vehicle and transfer the time to the relay station for billing. The citizens directly use the bank card to pay the fee on the POS machine. At the same time, the camera function of the device is used to take pictures without paying the vehicle, and the vehicle information is recorded into the relevant website, and certain measures are taken for the escaping vehicle.
advantage
one. It is convenient to install and maintain. It does not need to close the lane and damage the road surface. When the hanger or side installation of the inspection point does not damage the road surface, it is only necessary to check the geomagnetic sensor during maintenance; the detection point is not easily damaged and is not affected by the road surface movement. ;
two. The geomagnetic sensor is detected by the change of the earth's magnetic field when the ferromagnetic object passes, so it is not affected by the climate;
three. By setting the sensitivity, the size of the ferromagnetic object can be identified, and the type of the vehicle can be roughly determined;
four. It does not respond to non-ferromagnetic objects, so it can effectively reduce false detections.
Disadvantage
In the parking space detection process, there may be an accuracy rate problem because there is a dead zone of detection. Different models will also cause insufficient magnetic field disturbance. In addition, the current quality level is not uniform, and stability is also an important issue. It is recommended to use the brand.
application
Geomagnetic sensors can be used to detect vehicle presence and vehicle identification. Compared with the currently used geomagnetic coil (also known as the ground-sensing coil) detector, the sensor that completes the vehicle detection by using the influence of the vehicle on the road through the road has a small installation size, high sensitivity, small construction amount, and long service life. The damage to the road surface is small (wired installation only needs to open a 5 mm wide seam on the road surface. The wireless installation only needs to make a hole with a diameter of 55 mm and a depth of 150 mm on the road surface. When the installation point is mounted on the hanger or side, there is no need to damage the road surface. And other advantages, will play a very important role in the information collection of intelligent transportation systems.
The smartphone compass function uses the geomagnetic field and the built-in geomagnetic sensor of the mobile phone to realize the geographical orientation. The direction of the compass pointer changes, indicating that the ground magnetic field and the built-in communication room sensor of the mobile phone have been functioning, but the direction is opposite. Due to external strong magnetic field interference, such as a strong magnetic field at a certain location, or other external factors opposite to the earth's magnetic field, it may be affected by this magnetic field. The eunuch screams that the Hailu can change a position at this time or the phone can be moved flat in a figure of eight to calibrate the compass.
It can be applied to mobile phones, game controllers, navigation, electronic guides, gestures and gesture recognition, fast input and other devices that need to sense the external magnetic field.
principle
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Guangdong Magic Electronic Limited , https://www.magicmax.cc