Click Here to download 9-page color brochure with detailed information on instrument configurations, with and without computers.
I. Complete Impact-Echo Test System, Including "Roll-On" Carrying Case
This system can be purchased with or without a notebook computer.
Typical Test Configurations
Two configurations of the instrument are shown above. The configuration for normal impact-echo testing is shown on the left. The principal components are hand-held transducer units (the cylindrical devices at the left in each photo), a set of spherical imactors (hardened steel ball bearings on steel rods, in front of computer), a notebook computer, a high-speed analog/digital data acquisition system (the box to the left of the computer), and a software system that guides and controls the tests and displays the results in graphical and numerical form.
Accurate measurements of depth and thickness require knowledge of the wave speed (speed of sound) in concrete, which can vary from about 3000 to 6000 meters/sec. (It is strongly dependent on the type of aggregate used.) With a single transducer (left above) wave speed can be measured by performing an impact-echo test on a slab of known thickness. Independent measurements of wave speed, for situations in which a slab of known thickness is not available, are made using two transducers fixed in a spacer bar as shown at the right above. An impact is made on a straight line between the two transducers and the time required for the direct P-wave to travel the known distance between the two transducers is measured.
With a 7.5 lb. notebook computer, the system on the left weighs about 13 lb. (6kg) and that on the right weighs about 18 lb. (8kg). Rugged, lightweight, wireless computers (total weight about 4.5 lb. or 2kg) that provide true mobility are now available (download brochure).
Power is provided by internal batteries in the notebook computer and data acquisition system. A fully charged notebook battery typically provides 2 - 3 hours of operating time, and spare batteries are readily available. The battery in the data acquisition system provides 6 - 8 hours of operating time when fully charged. An external power supply is not required for operation in the field. Adapters are included for powering the system and/or recharging the batteries from a 110/220v AC source or a 12v DC source, such as a car or truck battery (connection made through cigarette lighter).
Pistol Grip Transducers
(Patented by Impact-Echo Instruments, LLC)
The cylindrical transducers shown in the pictures at the top of the page are especially useful for work in narrow and confined spaces. For wave speed measurements, two cylindrical transducers are strapped in a spacer bar (right hand picture at top of page). Alternative designs, called “pistol grip transducers”, are shown in the photos above. The pistol grip models are well suited to use on flat surfaces. The dual pistol grip transducer on the right is used for wave speed measurements. It has two sensing elements separated by the same fixed distance (300mm) as in the two cylindrical transducers held by a spacer bar (right photo at the top of the page). The dual pistol grip transducer eliminates the need to strap two cylindrical transducers into a spacer bar for wave speed measurements. Pistol grip transducers have a “trigger” arming switch, positioned on the underside of the grip (not visible in these photos). One single pistol grip and one dual pistol grip can be substituted for two cylindrical transducers and a spacer bar at no additional cost.
Components:
*Impact-E software is copyrighted and protected, and is sold only as part of an impact-echo test system.
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Copyright © 1999 by Impact-Echo Instruments, LLC. All rights
reserved.
All prices and specifications subject to change without notice.
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