Micro ground buried coil type fixing traffic flow investigation apparatus

Abstract

The invention relates to fixed traffic flow investigating equipment of an ultra-micro buried coil type, which comprises electromagnetic probes (1), tuned circuits (2), a current source (3), a phase lock (4), a phase comparer (5) and a signal amplifier (6), wherein each electromagnetic probe (1) is an ultra-micro buried coil, the signal amplifier (6) is connected with a supersonic detector (7) which is connected with a data transmission terminal (8), and the data transmission terminal (8) is connected with the Internet (9) which is connected with a data center (10). The invention overcomes the defects of great road damage, poor signal reliability, and the like of the prior traffic flow detection device and has the advantages of little road damage, accurate signal detection, and the like.

Description

technical field [0001] The invention relates to a miniature buried coil type fixed traffic flow investigation device. It uses the principle of ground sense coil detection, which can realize the collection of traffic flow information on highways, bridges, tunnels and special road sections, and truly and effectively reflect traffic flow data. Background technique [0002] Among the existing traffic flow investigation devices, there is a traditional miniature buried coil for detecting traffic flow information and traffic flow data on highways. But this kind of miniature buried coil has some very serious disadvantages: ① Since the polarity of the induced signal is determined by the polarization direction of the vehicle, and the polarization direction of the vehicle cannot be absolutely consistent, it depends on the manufacturing and processing of the steel plate and even the vehicle Due to the influence of the earth's magnetic field and many other factors, the polarities of the...

AI Technical Summary

Problems solved by technology

But this kind of miniature buried coil has some very serious disadvantages: ① Since the polarity of the induced signal is determined by the polarization direction of the vehicle, and the polarization direction of the vehicle cannot be absolutely consistent, it depends on the manufacturing and processing of the steel plate and even the vehicle Due to the influence of the earth's magnetic field and many other factors, the polarity of the signals detected at both ends of the coil is inconsistent, and the back-end identification processing is difficult

②The induced signal strength varies greatly. When a vehicle passes through the coil, the signal difference can even reach 10,000 times. Due to the aforementioned inconsistency in polarity, the design of the amplifier is very difficult, and the signal is easily distorted during the amplification process.

③Because the driving routes of the vehicles are not completely consistent, even if the same vehicle repeatedly passes through the same detection area, different or even very different signals may be obtained

It is difficult to separate the two parameters of vehicle speed and vehicle magnetic field

⑤ The magnetic field parameters of different vehicles are not clearly corresponding to the vehicle models, and the difference between two vehicles of the same model is often greater than the difference between them and other models

Even under ideal conditions, the speed of the vehicle is exactly the same, it is difficult to find the relationship between the magnetic field parameters and the vehicle type

⑥Usually, the signal is extremely weak, it is easy to be interfered, and the attenuation is also fast

⑦The detection range of the coil is small, and small vehicles are easy to miss detection

Microcoils could not meet these requirements for a while, and gradually faded out of this market

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