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slab impulse response, olson, olson engineering, ndt, nondestructive testing, slabs on grade, subgrade voids

February 23, 2020

East Coast

NDE users seminar offered at Olson's Rockville MD office

March 10-12 2020

Click here for details

NDT System Add-On — Slab Impulse Response

USA Sales: 303.423.1212          International Sales: Click here for Agents

Slab Impulse Response

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subgrade voids, slabs on grade, voids, delaminations, concrete slabs, retaining walls, ndt, nondestructive testing
Base Model:
SIR-1 [Slab Impulse Response]

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Scroll down to see a list of Key Features and Models available for the Slab Impulse Response Add-on System.

Save money! Contact Olson Instruments when adding on to an existing system, or purchasing multiple systems as some of the components are common to other test methods.

Contact Olson Instruments for complete details about the Slab Impulse Response system available as an add-on test with the Freedom Data PC or NDE 360 platforms.

For a quote, call our toll free number at 1-888-423-1214 or fill out our


The Slab Impulse Response method is excellent for evaluating the condition of slab subgrade support.

The Slab Impulse Response (SIR) system is designed to identify subgrade voids below slabs-on-grade less than two feet thick. In addition, the Slab IR test method can be used on other concrete structures to quickly locate areas with delaminations or voids in the concrete, if the damage is relatively shallow. Slab IR can be performed on reinforced and non-reinforced concrete slabs as well as asphalt or asphalt-overlay slabs.

The Slab IR testing method is often used in conjunction with GPR for subgrade void detection and mapping. Collecting Slab IR data at multiple, densely spaced locations can improve the conclusions by mapping relative areas of higher and lower mobility. Relatively low mobility (velocity/force) and flexibility (displacement/force) qualitatively indicates that such an area appears to be more solidly supported than an area with relatively high mobility and flexibility.

Freedom Data PC or NDE 360 Platform
Required, Sold Separately
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Hands-on training is available for all of our Nondestructive Testing Methods at our Wheat Ridge, Colorado (USA) location, which is a suburb located appromately 15 minutes northwest of downtown Denver. Training may be available at your location by one of our agents upon special arrangement.

Applicable On:

  • Concrete Slabs
  • Pavements
  • Pool Bottoms
  • Pond Bottoms
  • Runways
  • Spillways
  • Tunnel Liners

Test For:

  • Delaminations in Decks
  • Soft, Weak Subgrade Support
  • Voids below Slabs/Tunnel Linings

Meets ASTM:

  • N/A

Meets ACI:

  • ACI 228.2R


All of Olson Instruments have been researched, tested, and used on-site daily by our sister company, Olson Engineering, world reknowned for NDT consulting. The OE Website is loaded with Tech Brief and project photos using the equipment shown on this website. Purchase our products to “do-it-yourself”, or hire an Olson Engineering Nondestructive Testing professional for your next project