What is the difference between a geomagnetic detector and a ground-sensing coil?

The wireless geomagnetic detector has replaced the inductive coil since its appearance. What is the difference between the two?

Experimental conditions:

1. Ground-sensing coil: According to the installation requirements of the ground-sensing coil, we made a coil of 5  1m X 1.2m, and then sent it to the MCU through the ground-sensing coil receiver contact to calculate the occupied time, and then display the occupied time data through the computer.

2, infrared detector: through the body block infrared detector infrared light to calculate the occupancy time. Since the infrared detector uses the principle of occlusion to generate a signal, there is no detection range and false detection, and it is used as a reference for comparison of measurement accuracy between the ground sense coil and the pass-through vehicle detector. We believe that infrared detection data is accurate and reliable.

3. Wireless geomagnetic detector: Simultaneous use of 2 wireless geomagnetic detectors can detect vehicle speed while detecting occupancy time. Only one wireless geomagnetic detector can be used to detect the occupancy time. The two speeds are also detected simultaneously while detecting the occupancy time to check the influence of the speed on the occupancy time.

It can be seen that the trend of infrared detectors, geomagnetism and ground-sensing coils is the same. It can be seen from the variation law that the geomagnetic data changes more closely to the infrared data changes, that is to say, the geomagnetism is closer to the real change.

The ratio of geomagnetism to infrared occupancy time is between 1.05 and 1.25, while the ratio of the sense coil to the infrared detection is between 1.05 and 1.55. Ideally, a horizontal straight line. In a non-ideal state, the range of variation is examined. The smaller the size and the smaller the range, the higher the availability and the more stable the detection time is detected by the detector. It is not difficult to see that the geomagnetic detector data is relatively stable and available.

The wireless geomagnetic detector can be modified to simulate the output signals of various sizes of geosynthesis coils, which can completely replace the application of the sense coils in traffic management. At the same time, the wireless geomagnetic detectors have many advantages that the inductive coils cannot match.

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