Hot Sale Loop Detector Coil With Good Quality Loop Detector Coil.
Hot Sale Loop Detector Coil
Hot Sale Loop Detector Coil. Under ideal conditions (regardless of the impact of all environmental factors), the embedding of the inductor coil only considers the size of the area (or perimeter) and the number of turns, regardless of the material of the wire. However, in practical engineering, the mechanical strength of the wire and the high and low-temperature anti-aging problems must be considered. In some environments, the acid and alkali corrosion resistance must also be considered. The vehicle detector will not function properly due to the aging of the wire or insufficient tensile strength to cause damage to the wire. In the actual project, it is recommended to use hot sale loop detector coil was Teflon high-temperature soft wire above 0.75-1.0mm. Usually, the detection coil should be rectangular. The two long sides are perpendicular to the direction of movement of the metal objects, and the spacing between them is recommended to be 1 meter. The length of the long side depends on the width of the road, and usually, the ends are 0.3 to 1 meter narrower than the road spacing.
In order to operate the detector optimally, the inductance of the wholesaler loop coil should be kept between 100uH and 300uH. In the case where the loop detection coil inductance is constant, the number of turns of the coil has an important relationship with the circumference. The smaller the circumference, the more the number of turns. Metal materials such as various cable pipelines, steel bars, and sewer covers may be buried under the road, which will greatly affect the actual inductance value of the coil, so the above table data is for user reference only. In actual construction, the user should use the inductance tester to actually test the inductance of the inductive coil to determine the actual number of turns in the construction, as long as the final inductance of the coil is within a reasonable working range (eg between 100uH and 300uH). When winding the coil, leave enough length of wire to connect to the loop sensor and ensure there is no joint in the middle. After winding the coil cable, the lead cable must be made into a tightly twisted pair, requiring a minimum of 1-meter twist 20 times. Otherwise, the untwisted output leads will be introduced to dry, making the hot sale loop detector coil inductance value unstable. The output lead length should generally not exceed 5 meters. Since the sensitivity of the detection coil decreases as the length of the lead increases, the length of the lead cable should be as short as possible.
The principle of action is: first create a circular groove on the ground, about 1 meter in diameter, or a rectangular groove of equal area, embedding two or three turns of wire in the groove, which constitutes a buried hot sale loop detector coil on the surface. This coil is part of the oscillating circuit, which consists of an oscillating circuit. The frequency of the oscillator can be measured by converting the oscillating signal to a frequency measuring circuit composed of a single chip microcomputer. When there is a large metal object such as a car passing through, the change of the oscillation frequency is caused by the change of the space medium (the oscillation frequency increases when there is a metal object), and the single-chip microcomputer can measure the frequency value of the change, that is, it can be perceived that the car passes by.