Underground Utility Line Locator And Method For Use
First Claim
1. A system for locating an underground utility line, wherein the utility line emits an electromagnetic field, the system comprising:
- a hand-held frame having a top and a bottom;
a top peak antenna supported on the frame proximate the top of the frame;
a bottom peak antenna supported proximate the bottom of the frame and separated from the top peak antenna by a known distance;
a null antenna supported on the frame and disposed at an orientation orthogonal to the top peak antenna and the bottom peak antenna;
wherein the top peak antenna and the bottom peak antenna define a locating plane;
an inclinometer supported on the frame to measure a tilt angle of the frame within the locating plane; and
a processor supported on the frame to determine a direct distance between the frame and the underground utility line using a signal strength of the electromagnetic field received at the top peak antenna compared to a signal strength received at the bottom peak antenna with the null antenna pointed substantially at the utility line;
wherein the processor determines a horizontal distance between the frame and a point on the ground above the utility line using the direct distance and the tilt angle of the frame.
1 Assignment
0 Petitions
Accused Products
Abstract
A locator for determining the location of a buried utility line from an offset position. The locator has a top peak antenna, a bottom peak antenna, and a null antenna. The locator is tilted until the null antenna is pointed directly at the utility line with the top and bottom peak antennas disposed in a locating plane that is substantially vertical and perpendicular to the line. The tilt angle of the locator and the direct distance between the locator and the utility is measured. The tilt angle and direct distance are used by the processor to determine the vertical and horizontal distances between the locator and the utility.
15 Citations
28 Claims
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1. A system for locating an underground utility line, wherein the utility line emits an electromagnetic field, the system comprising:
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a hand-held frame having a top and a bottom; a top peak antenna supported on the frame proximate the top of the frame; a bottom peak antenna supported proximate the bottom of the frame and separated from the top peak antenna by a known distance; a null antenna supported on the frame and disposed at an orientation orthogonal to the top peak antenna and the bottom peak antenna; wherein the top peak antenna and the bottom peak antenna define a locating plane; an inclinometer supported on the frame to measure a tilt angle of the frame within the locating plane; and a processor supported on the frame to determine a direct distance between the frame and the underground utility line using a signal strength of the electromagnetic field received at the top peak antenna compared to a signal strength received at the bottom peak antenna with the null antenna pointed substantially at the utility line; wherein the processor determines a horizontal distance between the frame and a point on the ground above the utility line using the direct distance and the tilt angle of the frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining the location of an underground utility line using a hand-held locator, the method comprising:
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positioning the locator at a point that is laterally displaced from the utility line; pointing a bottom of the locator toward the utility line by tilting the locator until a minimum signal is measured at a null antenna; measuring a tilt angle of the locator; measuring a signal strength of an electromagnetic field transmitted from the utility line at a top peak antenna and a bottom peak antenna, wherein the top peak antenna and the bottom peak antenna are separated by a known distance; processing the measured signal strength of the top peak antenna and the bottom peak antenna to determine a direct distance between the locator and the utility line; determining a horizontal distance to the utility line based on the tilt angle of the locator and the direct distance; and displaying the horizontal distance. - View Dependent Claims (13, 14, 15, 16)
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17. A system for determining the location of a utility line that emits an electromagnetic signal, the utility line being disposed at least partially under a surface obstruction that prevents placing the locator directly above the utility line, the system comprising:
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a locator comprising; a frame having a top and a bottom; a display; a top peak antenna disposed proximate the top; a bottom peak antenna disposed proximate the bottom of the frame and separated from the top peak antenna a known distance; a null antenna supported on the frame orthogonal to the bottom peak antenna; an inclinometer supported by the frame to detect a tilt angle of the frame; a processor to determine a direct distance between the locator and the underground utility line using a signal strength of the electromagnetic field received at the top peak antenna compared to a signal strength received at the bottom peak antenna with the null antenna pointed substantially at the utility line; wherein the processor uses the direct distance and the tilt angle of the frame to calculate a shortest horizontal distance between the locator and a point on the ground above the utility line and within a plane defined by the top peak antenna and the bottom peak antenna; and wherein the processor sends a display signal to the display to show the direct distance and the shortest horizontal distance. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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- 25. A locator for determining the depth of and location on the surface above a utility line while the locator is not directly above the utility line and a null antenna is pointed at the line.
Specification