CN212623123U

CN212623123U - Cable detector device capable of dynamically filtering environmental interference

Info

Publication number: CN212623123U
Application number: CN202021875327.0U
Authority: CN
Inventors: 杨继涛
Original assignee: Guizhou Langxing Intelligent Co ltd
Current assignee: Guizhou Langxing Intelligent Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-02-26
Anticipated expiration: 2030-09-01

Abstract

The embodiment of the utility model relates to the technical field of metal pipeline detection, in particular to a cable detector device for dynamically filtering environmental interference, which comprises a transmitter and a receiver, wherein the transmitter comprises a timer and a control switch, and the control switch is configured to periodically transmit an output signal based on a received signal source at a controller of the timer; the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit. The utility model discloses beneficial effect does: the cable detector can directly enter a working state without calibration before working; the operation is simpler; the environmental noise can be dynamically filtered, and the instrument can accurately work in high-voltage lines, machine rooms and other high-interference environments; the error that the measuring accuracy of instrument itself brought can dynamic calibration, promotes the rate of accuracy of surveying.

Description

Cable detector device capable of dynamically filtering environmental interference

Technical Field

The utility model relates to a metal pipeline surveys technical field, concretely relates to cable detection instrument device of dynamic filtering environmental disturbance.

Background

The cable detector consists of a group of signal transmitters and receivers. The method is generally used for routing and positioning of metal pipelines such as electric cables, optical cables (optical cables with metal reinforced cores), long-distance tracking, depth measurement of underground metal pipelines and the like. The transmitter transmits a low-frequency (generally less than 200kHz) alternating current signal to the target cable, and the receiver acquires information such as the route and the depth of the cable by detecting the direction and the strength of an electromagnetic field radiated by the target cable.

In the actual use process, electromagnetic field interference (namely, environmental noise) exists around us at any moment, and the interference mainly comes from the following sources: electrical appliances in operation, power lines, base station signals, etc. Therefore, the receiver of the cable detector must filter the electromagnetic field interference of the environment itself, and accurately recover the electromagnetic field signal radiated by the target pipeline itself, so as to accurately detect the target pipeline. Therefore, filtering out ambient noise is an essential function of the receiver.

The prior art is a static ambient noise filtering method, which sequentially and statically filters out ambient noise before the cable detection operation starts. The method comprises the following steps: 1) before the transmitter sends the low-frequency electric signal to the target cable, the receiver samples and records the environmental noise of the target frequency; 2) starting a transmitter to transmit a signal of a target frequency to a target cable, and formally starting working; 3) and the receiver subtracts the environmental noise from the received signal with the target frequency to restore the real signal on the target cable.

The disadvantages of this method are as follows:

the use scenario of the cable probe determines that the receiver needs to continuously probe along the target cable, but the environmental variables may not be the same at different locations. For example, in the process of detecting a cable several kilometers long, the cable may need to pass through the lower part of the high-voltage wire, and the static filtering method is performed before the detection operation starts, so that the environmental noise of the high-voltage wire occurring in the detection process cannot be filtered, and the effective operation of the detection operation is affected. In this case, the transmitter can only be notified to restart at a far-away transmitting end, and static noise filtering is performed again in cooperation with the receiver before starting, so that the working efficiency is greatly reduced.

In some specific scenes, the environmental noise may also be suddenly enhanced and weakened, and the existence of the change cannot be obviously judged through a high-voltage wire, at the moment, the static filtering method cannot accurately filter the environmental noise, and the detected environmental noise is not strictly consistent with the filtered environmental noise, so that the detection result is influenced.

Accordingly, there is a need for a cable probe device that dynamically filters out environmental interference to overcome the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In order to solve above-mentioned problem, be the unsafe problem of solution detection efficiency low, testing result promptly, the embodiment of the utility model discloses a cable detection instrument device of dynamic filtering environmental disturbance, including sender and receiver, wherein:

the transmitter includes a timer and a control switch configured to periodically transmit an output signal based on a received signal source at a controller of the timer;

the receiver comprises a signal receiving circuit, an A/D conversion circuit, an effective signal judgment circuit, a signal intensity calculation circuit and a noise elimination circuit which are sequentially connected in series, wherein a noise intensity calculation circuit is also connected in series between the effective signal judgment circuit and the noise elimination circuit, wherein:

the signal receiving circuit is configured to receive the output signal;

the A/D conversion circuit is configured to convert the output signal into a digital signal;

the valid signal decision circuit is configured to decide validity of the digital signal;

the signal strength calculation circuit is configured to calculate a signal strength of the digital signal;

the noise intensity calculation circuit is configured to calculate a noise intensity of the digital signal;

the noise elimination circuit is configured to eliminate the noise of the effective signal with the signal intensity smaller than the preset signal intensity and the noise intensity larger than the preset noise intensity.

The embodiment of the utility model provides a second aspect discloses a method of dynamic filtering environmental disturbance, including the step:

the transmitter periodically transmits an output signal to the target cable, and the receiver periodically samples the environmental noise in the signal interruption time slot and periodically filters the sampled environmental noise in the signal working time slot.

The utility model discloses beneficial effect does:

1. the existing scheme needs to finish the calibration before detection and capture the environmental noise. The utility model discloses need not the check before the work, the cable detection instrument can directly get into operating condition. The operation is simpler.

2. The utility model discloses but dynamic filtering ambient noise, the instrument can be accurately worked at high-voltage line, high interference environment such as computer lab.

3. Except dynamic filtering ambient noise, the utility model discloses the error that can also dynamic calibration instrument measurement accuracy of own brought promotes the rate of accuracy of surveying.

Drawings

FIG. 1 is a schematic diagram of the environmental noise filtering apparatus according to the present invention;

FIG. 2 is a block diagram of an embodiment of a transmitter;

FIG. 3 is a block diagram of an embodiment of a receiver;

fig. 4 is a diagram illustrating the operation of filtering the ambient noise according to the prior art.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

Referring to fig. 1 to 4, a first aspect of the present invention discloses a cable detector device for dynamically filtering environmental interference, including a transmitter and a receiver, wherein:

the signal receiving circuit is configured to receive the output signal;

From the operation flow of the instrument: the existing scheme has a calibration link before the instrument works, and environmental noise is sampled in the link so as to be filtered during actual work; the utility model discloses need not the school and to link filtering noise in environment, the instrument can directly get into the work link.

Transmitter signal transmission from the instrument: in the existing scheme, a transmitter transmits a low-frequency alternating current signal to a target cable in a working link, and the signal is continuously uninterrupted in the working process; the utility model discloses send low frequency alternating current signal by the sender regularly toward the target cable, this signal can be periodic interruption in whole working process, and the receiver is at signal interruption slot periodic sampling ambient noise, at the ambient noise that signal working slot periodic filtering was sampled.

Sampling and filtering from the ambient noise of the instrument's receiver: in the existing scheme, a receiver finishes sampling of an environment variable in a calibration link, and the receiver filters the environment variable in a working process; the utility model discloses in by the receiver at signal interruption time slot dynamic sampling environment variable, at signal recovery time slot filtering environment variable.

The output signal is a low frequency alternating current signal.

It should be noted that the timer, the control switch, the signal receiving circuit, the a/D conversion circuit, the effective signal decision circuit, the signal strength calculation circuit, the noise strength calculation circuit, and the noise cancellation circuit may all adopt existing circuit modules, and are not described herein again.

The embodiment of the utility model provides a second aspect discloses a method of dynamic filtering environmental disturbance, and this method has used arbitrary foretell device, and this method includes the step:

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "comprises," "comprising," or any other similar term are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A cable probe apparatus for dynamically filtering environmental interference, comprising a transmitter and a receiver, wherein:

the signal receiving circuit is configured to receive the output signal;

2. The cable probe apparatus for dynamically filtering environmental interference according to claim 1, wherein said output signal is a low frequency ac signal.