Salem, NH, United States
Salem, NH, United States

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Patent
Geophysical Survey Systems Inc. | Date: 2015-12-29

In an embodiment of the disclosed technology, a visual output of data from a ground-penetrating radar and magnetic field measuring device is displayed on a visual medium. The display has a first exhibition of output from the ground-penetrating radar device and a second from a magnetic field measuring device, such as a very low frequency (VLF) receiver. Using an identical axis, such as an X-axis measuring time or distance, output of each device is exhibited and overlaid over one another. In this manner, one can detect (using two different methodologies and uses) the visual exhibition of both to best determine the location of a metal or electrical target.


Patent
Geophysical Survey Systems Inc. | Date: 2012-08-17

In an embodiment of the disclosed technology, a visual output of data from a ground-penetrating radar is displayed on a visual medium. The display has a first exhibition of output from a higher frequency range antenna, a second exhibition of output from a lower frequency range antenna (compared to the other antenna; see definition in the detailed description), and a transition area between the first and second exhibition having merged data from the lower frequency antenna and the higher frequency antenna. The depth range of the transition area may be varied based on optimal depth range of each antenna, such as manually by a viewer viewing the visual output, which may occur in real-time, that is, while operating the radar and viewing the visual output thereof. Or, the transition depth range and/or width of the transition region may be varied as part of post-processing.


Patent
Geophysical Survey Systems Inc. | Date: 2015-06-19

The disclosed technology includes a device and method of use for direct printing and ink or other marking, in conjunction with GPR techniques. In a most basic embodiment of the disclosed technology, a relevant date, time, filename, and other parameters are printed or otherwise physically exhibited on the measurement surface, so that RADAR files can be later attributed to a specific data collection site. In a more advanced embodiment of the disclosed technology, actual RADAR target information is printed, or otherwise physically exhibited, on the measurement surface, such as while measuring, or substantially while measuring, the surface and substrate beneath with GPR.


Embodiments of the disclosed technology use high-speed interpolated (interdigitated) sampling for the specific purpose of GPR (Ground-Penetrating RADAR). This technology solves several issues associated with high-speed sampling in GPR which included 1) dynamic range limitations, 2) regulatory compliance issues, 3) sampler core offset error, and 4) timing errors. High-speed interpolated sampling GPR is implemented using a high-speed ADC in combination with trigger logic (such as an FPGA) and a programmable delay generator. The FPGA or other trigger logic generates a series of randomly dithered trigger pulses. A variable delay generator (or Vernier) is synchronously controlled in order to produce the fractional timing. The timing of the pulses is randomly or pseudo-randomly dithered, and the phase of the interpolation is shuffled in order to avoid producing discrete spectral lines in the radiated RADAR signal.


Patent
Geophysical Survey Systems Inc. | Date: 2014-04-16

The disclosed technology includes a device and method of use for direct printing and ink or other marking, in conjunction with GPR techniques. In a most basic embodiment of the disclosed technology, a relevant date, time, filename, and other parameters are printed or otherwise physically exhibited on the measurement surface, so that RADAR files can be later attributed to a specific data collection site. In a more advanced embodiment of the disclosed technology, actual RADAR target information is printed, or otherwise physically exhibited, on the measurement surface, such as while measuring, or substantially while measuring, the surface and substrate beneath with GPR.


Patent
Geophysical Survey Systems Inc. | Date: 2011-06-10

Embodiments of the disclosed technology comprise a ground penetrating radio device and methods of use for obtaining greater resolution. This is achieved by measuring the composition/reflection off a homogeneous material (e.g., metal plate), determining coefficients to correct the measured/reflection in order to make the measurements look like an idealized reference signal, and then using these coefficients in a digital filter to correct measurements/a reflection off a heterogeneous material, such as a road surface. In this manner, the composition of the heterogeneous material is determined with greater accuracy.


Patent
Geophysical Survey Systems Inc. | Date: 2014-01-22

In an embodiment of the disclosed technology, a visual output of data from a ground-penetrating radar is displayed on a visual medium. The display has a first exhibition of output from a higher frequency range antenna, a second exhibition of output from a lower frequency range antenna (compared to the other antenna; see definition in the detailed description), and a transition area between the first and second exhibition having merged data from the lower frequency antenna and the higher frequency antenna. The depth range of the transition area may be varied based on optimal depth range of each antenna, such as manually by a viewer viewing the visual output, which may occur in real-time, that is, while operating the radar and viewing the visual output thereof. Or, the transition depth range and/or width of the transition region may be varied as part of post-processing.


Embodiments of the disclosed technology use high-speed interpolated (interdigitated) sampling for the specific purpose of GPR (Ground-Penetrating RADAR). This technology solves several issues associated with high-speed sampling in GPR which included 1) dynamic range limitations, 2) regulatory compliance issues, 3) sampler core offset error, and 4) timing errors. High-speed interpolated sampling GPR is implemented using a high-speed ADC in combination with trigger logic (such as an FPGA) and a programmable delay generator. The FPGA or other trigger logic generates a series of randomly dithered trigger pulses. A variable delay generator (or Vernier) is synchronously controlled in order to produce the fractional timing. The timing of the pulses is randomly or pseudo-randomly dithered, and the phase of the interpolation is shuffled in order to avoid producing discrete spectral lines in the radiated RADAR signal.


Patent
Geophysical Survey Systems Inc. | Date: 2012-10-11

The disclosed technology includes a device and method of use for direct printing and ink or other marking, in conjunction with GPR techniques. In a most basic embodiment of the disclosed technology, a relevant date, time, filename, and other parameters are printed or otherwise physically exhibited on the measurement surface, so that RADAR files can be later attributed to a specific data collection site. In a more advanced embodiment of the disclosed technology, actual RADAR target information is printed, or otherwise physically exhibited, on the measurement surface, such as while measuring, or substantially while measuring, the surface and substrate beneath with GPR.


News Article | November 22, 2016
Site: www.prweb.com

Infrasense, Inc. recently completed subsurface pavement structure investigations of over 180 lane-miles in Minnesota’s Metro and Northeast Regions using high-speed ground penetrating radar (GPR). In the Metro Region, a lane and shoulder were surveyed in both driving directions to detect any changes in structure across the pavement. After data collection was completed, a preliminary review of the continuous GPR data was completed to identify homogenous areas of pavement structure and locate representative locations for subsequent core sampling. On average, the GPR asphalt results were within 8.6% of the measured core thicknesses. The results of this project provide MnDOT with important decision-making information in their pavement design process. Additionally, the results of the GPR evaluations are used in construction planning to identify appropriate pavements for traffic staging during construction. The pavement structure data was collected with a single air-coupled radar antenna manufactured by Geophysical Survey Systems Inc. (GSSI), and was synchronized with a Global Positioning System (GPS) to provide coordinate locations for the detected pavement thicknesses. Data collection was performed at driving speeds allowing traffic to flow without any disruption. Pavement structure results were provided in geospatial, tabular, and graphical formats. Infrasense has played a key role in the development and implementation of GPR for pavement assessments over the past 25 years. Currently, the most common application of this state-of-the-art technology is the determination of pavement layer thickness because, unlike traditional coring, GPR requires no lane closures and provides a timely and cost-effective means of collecting continuous thickness data. This data may be used for network-level pavement management, project-level rehabilitation design, or quality assurance of newly constructed pavements. Infrasense surveys have covered over 10,000 lane miles of pavement. Projects range in size from our recent project asphalt thickness project on Interstate 85 in South Carolina, to a survey of over 2600 miles of county roads in North Dakota working with the North Dakota State University's Upper Great Plains Transportation Institute. At the network level, GPR can provide layer structure data used to identify homogeneous sections and to compute the remaining life of segments of the network. Computation of remaining life enables highway agencies to optimize their programming and planning of pavement rehabilitation. A number of agencies have implemented GPR at the network level, including the California Department of Transportation (CalTrans) and the Oklahoma DOT. At the project level, GPR data provides information that enables owner agencies and consultants optimize rehabilitation design by providing accurate information on the current pavement structure. GPR data is also used to implement pavement recycling by providing details on the thickness of the bound material and how it varies over the project length. Many GPR pavement thickness studies focus on supporting FWD operations. Pavement strength evaluations using a Falling Weight Deflectometer (FWD) provide useful data to pavement engineers for estimating remaining life and planning rehabilitation. Accurate pavement layer thickness data enhances FWD pavement strength evaluations, because thickness data is required for calculation of the pavement moduli, and GPR can provide this continuous thickness information quickly and efficiently. Infrasense has provided pavement thickness data for 24 airports in South Carolina in order to supplement FWD testing on the runways, taxiways, and aprons, where limited access meant the high speed GPR surveys were especially suited for the job. Layer thickness estimates are also useful for quality assurance/quality control (QA/QC) for construction of new pavements and overlays. GPR can provide a faster and more complete means of nondestructively obtaining QA/QC data than coring. Inadequate layer thickness can be quickly identified, and construction pay factors may be determined. About Infrasense, Inc. Since 1987, Infrasense, Inc. has applied the most current technologies to the most difficult challenges in subsurface scanning. Infrasense’s engineers are able to nondestructively extract critical information from a diverse range of structures. The firm has conducted research to advance the field of subsurface detection, while also providing valuable information to clients across the country. Learn more about Infrasense, Inc. and its services at http://www.infrasense.com.

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