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Hilti ferroscan rv 10 concrete rebar scanner
HILTI FERROSCAN RV 10 CONCRETE REBAR SCANNER
Hilti Ferroscan RV-10 with Hilti Ferroscan Rs-10
* Hilti Ferroscan RV-10 Monitor
* Hilti Ferroscan RS-10 Scanner
* Hilti TCU 12H :one hour battery Charger
* 3 Hilti rechargeable batteries
* 1 Serial interface connecting cable
* 1 PC Program for data analysis
* Hilti Impact resistant portable case
We loaded the Monitor with rechargeable battery and connected the RS 10 Scanner to the RV10 Monitor. The unit powered up and we ran the scanner across the wall and took some pictures of the readings. The unit is in good condition . Please refer to pictures for reference.Questions welcome . Additional pictures can be provided on request.
Information on Ferroscan from the web:
Ferroscan, manufactured by the HILTI Corporation (Schaan, Liechtenstein), has appeared on the market at the beginning of the `90s and is targeted at the visualization of steel rebars in concrete.
The heart of the system is represented by the RS 10 multisensor scanner (Figure 4, right), of size 230x140x140 mm and weight 1 kg, which is able to scan a width of 15cm.
Results are displayed on the RV 10 monitor (Figure 4, left), of size 270x200x80 mm and weight 2.2 kg (accumulators included). Its backlight LCD works on 320x240 pixels using 9 grey levels. The monitor can be interfaced to a PC via a standard serial RS 232 interface to download the acquired data, with a maximum of 42 raw data files, each one corresponding to a full acquisition. A PC version of the data processing software running on the monitor's 16 bit microprocessor is also available [HIL1].
The maximum area which can be covered and analyzed in a single image is 60x60 cm and has to be crossed horizontally and vertically, for a total of eight scans (four in each direction, see Figure 5). Up to 42 images can be stored.
This because the system, due to its differential nature, is not able to find objects located parallel to the scanning direction. The latter is in fact strictly true only for rebars somewhat longer than the scan, in the sense that any object shorter than the scan length will produce at least a signal at its beginning and at its end; this will have some interesting implications on the objects of interest to us. Note that diagonally lying objects are displayed with slightly worsened resolution (fuzzier image)
The maximum scanning speed is 0.5 m/s, which looks quite sufficient for hand-held operation; a complete scan is therefore obtained rather quickly. Note that the area of interest can be smaller if necessary, but only sections containing both horizontal and vertical data are actually displayed and analysed
The distance is measured along the track by odometry, using an optical encoder, given that the surface used is almost always flat. One set of two wheels is placed at each end of the scanner, the four wheels moving together to guarantee displacements as parallel as possible along the scanning direction.
The Ferroscan system is one of the few commercially available metal detector, if not the only one, capable of providing the user with visual information of the objects under study, in addition to "traditional" indications on depth and diameter. The Ferroscan images are indeed a precious aid in localizing and interpreting the underlying metallic structure, without pretending to deliver a true representation of it. This task has been solved by employing multisensor hardware and, as far as we have been able to judge, simple and elegant data processing software. Imaging has also been "eased" by the fact that the nature of the problem is rather well defined a priori, i.e. mostly cylindrical parallel ferromagnetic objects placed horizontally in standard patterns at shallow depth.
The multisensor arrangement is practical to scan quickly a large area. On the other hand using more than one sensor, and the differential arrangement itself, have some side effects for the visualization of smaller isolated (ferromagnetic) objects, for which the system was indeed not intended, and in presence of edges. And the increased spatial resolution comes obviously at the price of decreased depth, to nobody s surprise.
The images obtained confirm nevertheless that this approach is potentially interesting, especially if one has to look for ferromagnetic objects, and, once more, that the task we face remains a formidable one. Improvements on the range and sensor directivity could come from the data processing side, for very weak signals for example, and from the sensors, where it has been suggested to use smaller probes, e.g. magnetoresistive or miniature fluxgate elements [Czi96], or to alter the coil geometry [Gay94].
First of all we would like to thank the EPFL which financed this work, and in particular Prof. Jean-Daniel Nicoud (DI/LAMI) who made it possible, as well as the HILTI Corporation, in the person of Hansj rg Nipp, for its very positive and cooperative attitude.
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