Difference Between Inductive And Stick Down Loop Detectors:
Inductive Loop Detectors:
Inductive loop detectors are regarded as the most reliable traffic classification method available. Essentially these loops create an electromagnetic communication or a detection system that uses an operating magnet or a staggering current to lead an electric current to a nearby wire. An system comprises a loop (pre-formed or saw-cut), loop extension cable, and a detector. The wire is generally formed in a rectangle and is installed under the road's surface. These loops function similarly as a metal detector, as they take into account the objects that are over. The loop field changes whenever a vehicle goes over these detectors. Inductive loop detectors are sometimes used along with axle sensors to collect other classification details like length data and speed.
These loops are extremely sensitive, and a mistake made at the time of installation could cause trouble in terms of performance indicators in the future. Hence, one must be extra careful when installing or troubleshooting an inductive loop detector, as that will prove to be the difference between reliable or unwarranted vehicle detection.
Specific positives of inductive loop detectors include their potency of high accuracy count figures and vehicle classification capability. However, one must also consider its negative aspects. This consists of needing to cut through asphalt during installation, along with the subsequent damage incurred on that road. Despite this, if the asphalt moves, the cables put down fail to work, deeming the installation redundant. They also disrupt traffic flow at the time of their installation and maintenance. Water penetration affects their performance as well.
Stick Down Loop Detectors:
Stick down loop detectors are made of electromagnetic loops available inbuilt and packed in a sealed, protective, adhesive membrane. These simply need to be laid out on the pavement or road as a whole. Because of its firmly self-adhesive structure, the can be used within the thin pavement layers without the need for saw cutting. As a result, the surface is smooth with no cracks due to trenching.
Absolute positives associated with these stick down detectors are that they do not disrupt traffic for long and allow vehicles to pass over them within a short installation period. Since they are made as stick down products with a peel-and-stick-down backing, they do not damage or soil the integrity of the pavement structure. The installation process is also straightforward and convenient. Most significantly, the numbers and placement of wires are visible at ridges in the sandwich; this makes on-site inspection and verification of correct configuration a breeze. These loops are compliant to both upper and lower surfaces; as a result, they reduce moisture ingress. Further, since these are encapsulated from the get-go, the wires have not exposed the gutter and provide additional protection from any physical damage. Another positive for those who opt for a sustainable option is that stick down loop detectors are eco-friendly.
The data mentioned above shows the functioning and features of inductive loop detectors and stick down loop detectors.