Loop Coil With Good Quality Loop Detector Coils For Sale.
Loop coil with Loop coil It is an oscillating circuit. It is constructed in such a way that a circular groove is formed on the ground, about 1 meter in diameter, or a rectangular groove of comparable area, and two to three turns of wire are buried in the groove, which constitutes An inductive coil buried in the earth's surface, this loop coil is part of an oscillating circuit. It consists of an oscillating circuit and a capacitor. The principle is that the oscillation is stable and reliable. This oscillating signal is sent to the frequency measuring circuit composed of the single-chip microcomputer through the conversion. Measure the frequency of this oscillator. 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 this change is used as the confirmation signal of the car through the "ground coil", and The time interval between the start and end of the signal can, in turn, be used to measure the speed of the car. This is the "ground coil". The key to the technology is that the designed oscillator is stable and reliable, and the frequency changes significantly when the car passes.
Under ideal conditions (regardless of the influence of all environmental factors), the embedding of the ground 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 anti-aging problem of high and low temperature must be considered. In some environments, the acid and alkali corrosion resistance must also be considered. The 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 Teflon high-temperature multi-strand soft wire of 1.0mm or more. our loop coils specification was 300v.
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. with loop detector coil, loop sensor coil, vehicle loop detector coil. Loop coil for sale. 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 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 is as short as possible.