Underground utility surveying

A technology for public facilities and detectors, used in geophysical surveys, measuring devices, radio wave measurement systems, etc., and can solve problems such as low accuracy and unsuitable calibration.

Active Publication Date: 2018-06-29
CABLE DETECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even with regular factory calibrations, actual calibrations may or become inappropriate in actual field operation
Aging, temperature drift of electronics, in addition to coil or antenna displacement, can have a negative impact on field use
Therefore, disadvantageously, the guaranteed accuracy level of the depth values ​​determined by such devices usually has to be kept low, for example, within a few decimeters to a few meters

Method used

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  • Underground utility surveying
  • Underground utility surveying
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Embodiment Construction

[0073] The figures of the accompanying drawings should not be considered to be drawn to scale. Where appropriate, the same reference numerals are used for the same features or features with similar functions. Different indexes to reference numbers are used to distinguish between different embodiments that are shown as exemplary of the same or equivalent features. The term "approximately" is used here to describe the fact that a particular value, arrangement, or characteristic does not necessarily need to be 100% accurate, but may be slightly fluctuating, but still within the range. In other words, for example, there may be some slight deviations due to imprecision, unintentional design considerations, tolerances, etc., but there is a clear trend toward the mentioned value or arrangement (especially in terms of the technical effects achieved with it). In particular, it does not mean the obvious opposite. In any case, in addition to the meaning of "almost exactly", the term "ap...

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Abstract

Provided is underground utility surveying. The invention relates to a mobile detection device (1) evaluating a depth value (13) of an occluded underground elongate utility line (10). The device (1) comprises at least a first (2a) and a second detector unit (2b), each comprising at least a detection loop (25a, 25b) and corresponding transmitting loops (27a, 27b) arranged close together. The device(1) also comprises at least one excitation coil (4) for emitting an alternating electromagnetic excitation field with its emission direction substantially in line with the sensitivity direction of thedetection loop (25a, 25b). The device has an electronic signal evaluation unit for detecting the utility line (10) according to an electrical signal induced in the detection loops and evaluating thedepth value (13) according to a difference of the electrical signal in-between the detection loops (25a, 25b). There is a compensation unit built to apply an electrical signal to the transmitting loops (27a, 27b) for establishing a compensation field (Bta, Btb), which nullifies influences of direct coupling residuals of the excitation field (Be) at the detection loops (25a, 25b).

Description

Technical field [0001] The present invention generally relates to a mobile detection device according to claim 1 and a method for detecting underground utility pipelines according to claim 10. Background technique [0002] A common task at the construction site is to use devices for testing underground utility pipelines, especially before or during soil removal. Such buried supply facilities often appear in the form of public utility pipelines for power supply, gas, fuel, water, or communication data from various types of underground structures. Because damage to such public facilities may cause serious impacts and costs, in order to be able to detect the proximity or preferably the exact location and / or depth of such public facilities on site before or during excavation , Make another measurement. Thereby, it is possible to determine or verify the path followed by the buried public facility and / or the buried depth of the public facility, for example, the distance from the dete...

Claims

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Application Information

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IPC IPC(8): G01V3/11
CPCG01V3/10G01V3/15
Inventor西蒙·布兰松
OwnerCABLE DETECTION