GPR Equipment Supplier - For Sale and Rental
Ground Penetrating Radar (GPR) is an important tool for utility locators around the world as it detects both metallic and non-metallic targets at different depths. The method itself has been around for more than 50 years, but most systems in the market offer limited visualization, both onsite and offsite.
GPR is a compact device that scans the subsurface in a non-destructive way. It can penetrate the surface from just a few centimetres down to tens or hundreds of meters, based on soil conditions and antenna characteristics. GPR emits electromagnetic (EM) waves into the subsurface and calculates the time these waves need to travel through the various subsurface material and return to the GPR receiver. This two-way travel time, along with a few other parameters such as the dielectric, provide the user an estimate of the target depth.
Currently, two different GPR technologies exist in the market - pulsed systems and stepped frequency devices. The pulsed systems send tiny pulses of EM wave down to the subsurface during periodic intervals, while the stepped frequency devices send continuous parcels of wave at different frequencies at the same time. In the past, due to computing limitations, pulsed systems were the preferred choice in the market.
Despite their popularity, they have several drawbacks, like the frequency dilemma, where a user must select multiple antennas at different frequencies to carry on different applications.
Pulsed systems are limited by the central frequency of the antenna, so they have specific limitations in terms of depth and resolution. Nowadays, stepped frequency is gaining popularity because with a single device you can sweep through the complete frequency spectrum, from low to high frequencies, so you can see depth and resolve small objects at the same time.
Can GPR Find All Targets?
GPR can detect metallic and non-metallic targets below the surface However, certain limitations exist, like the depth to target limitation. The rule of thumb is that GPR can detect almost any target if it is at least one inch (2.54 cm) in diameter and is buried at one foot (0.30 m) or shallower. For example, it may be impossible for GPR to locate a 3-in. (7.6 cm) plastic pipe at a 6-ft. (1.82 m) depth.
Metallic targets are doing better with this rule. However, stepped frequency continuous wave (SFCW) technology, combined with powerful software on your iPad (for example), you can get unmatched performance, data clarity, and user experience. Previous limitations on depth to target are being handled better with the SFCW technology.
GPR is a compact device that scans the subsurface in a non-destructive way. It can penetrate the surface from just a few centimetres down to tens or hundreds of meters, based on soil conditions and antenna characteristics. GPR emits electromagnetic (EM) waves into the subsurface and calculates the time these waves need to travel through the various subsurface material and return to the GPR receiver. This two-way travel time, along with a few other parameters such as the dielectric, provide the user an estimate of the target depth.
Currently, two different GPR technologies exist in the market - pulsed systems and stepped frequency devices. The pulsed systems send tiny pulses of EM wave down to the subsurface during periodic intervals, while the stepped frequency devices send continuous parcels of wave at different frequencies at the same time. In the past, due to computing limitations, pulsed systems were the preferred choice in the market.
Despite their popularity, they have several drawbacks, like the frequency dilemma, where a user must select multiple antennas at different frequencies to carry on different applications.
Pulsed systems are limited by the central frequency of the antenna, so they have specific limitations in terms of depth and resolution. Nowadays, stepped frequency is gaining popularity because with a single device you can sweep through the complete frequency spectrum, from low to high frequencies, so you can see depth and resolve small objects at the same time.
Can GPR Find All Targets?
GPR can detect metallic and non-metallic targets below the surface However, certain limitations exist, like the depth to target limitation. The rule of thumb is that GPR can detect almost any target if it is at least one inch (2.54 cm) in diameter and is buried at one foot (0.30 m) or shallower. For example, it may be impossible for GPR to locate a 3-in. (7.6 cm) plastic pipe at a 6-ft. (1.82 m) depth.
Metallic targets are doing better with this rule. However, stepped frequency continuous wave (SFCW) technology, combined with powerful software on your iPad (for example), you can get unmatched performance, data clarity, and user experience. Previous limitations on depth to target are being handled better with the SFCW technology.
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Symetrics is renting a wide range of geophysical and NDT equipment to users who don't have the budget to buy equipment.
Please contact us today for a quote. Our prices are the most competitive in the market.
Please contact us today for a quote. Our prices are the most competitive in the market.