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Dasel sistemas - Ultrasound Technology

portada2DASEL is a company specialized in the development of high-end ultrasound technology. We offer at the same time flexible solutions according to each client requirements. Therefore the quality level in our products has not been neglected. Quality is a commitment that DASEL applies in all production areas to maintain traceability of manufactured products. For this reason the company has been certified ISO 9001:2015 by Bureau Veritas in the equipments production and calibration.


portada DASEL develops all its products with a modular architecture and using high-density re-configurable devices (FPGAs). Given the high cost for new hardware development, this design philosophy allows to adjust our systems to many different applications, with the incorporation of new functions or specific algorithms with no need to upgrade the equipment electronics.



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Andalusia celebrates the third edition of the "Aerospace and Defense Meetings Sevilla-ADM". The congress, to be held from 10 to 13 May 2016, already has registered 408 companies from 24 countries.

This event has become the most important aerospace event in Spain and as a key appointment for the strategic sector of Andalusia.

DASEL and TECNITEST be present at the third edition of the most important BtoB event dedicated to the aviation and space to be held in Seville from 10 to 13 May 2016 sector.

We will be happy to welcome you to our Stand D 16-18, where you can see and check the development of our inspection technology Ultrasonic Phased Array based technology and non-contact inspection system for air.

You can sign in on this link:  http://meetings.bciaerospace.com/sevilla/2016/



Sector                         : Rail Transport, Metallurgical Industries

Material                     : Steel

Technology                : Phased Array

Equipment                 : SITAU-311

Keywords                  : Phased Array, Progressive Focusing, Steel Bolt


Title                            : Steel bolts inspection with ultrasound arrays


1. Introduction


Ultrasound inspection of complex geometry and/or difficult access components can be performed with phased-array systems, due to their ability of electronically modifying the ultrasonic beam properties. The inspection of bolts and threaded rods is a clear example of this problem.

In this work, the evaluation of brake disc fixation bolt integrity, used at high speed train wheels, is presented. Inspection procedure is detailed, and it is shown how progressive focusing technique (ProFoc®) ensures the best lateral resolution at any inspection depth.


2. Materials and Methods


A phased array with 32 elements, inter-element pitch of 0.5mm and 5 MHz was used, in contact with the flat surface of the inspected part (see Figure 1). A SITAU-311 equipment was used, with 32 channels multiplexed to 128 array elements, and angular B-Scans between -50º and 50º were performed.




Figure 1 – Inspection scheme

3. Results


The goal of the inspection is to detect three artificial notches that emulate a broken thread at different depths. Figure 2 shows resultant images with three configurations: (a) fixed focus at 20mm, (b) fixed focus at 40 mm and (c) progressive focusing (ProFoc®).

A quite short deep of field (DOF) is obtained when a single focus is applied, which prevents to evaluate the whole component with a single image. Progressing focusing technique overcomes this problem, because it maintains a constant angular resolution at any inspection depth.

The echo generated by the thread edge is attenuated when it is damaged, which can be easily detected in the image ( figure 2.c ). Also geometric aberrations and internal cracks could be evaluated with this technique.




Figure 2 –Images obtained with (a) fixed focus at 20mm, (b) fixed focus at 40 mm and (c) with progressive focusing (ProFoc®)


4. Conclusions


Electronic scan allows evaluating the whole component with a single array transducer. Moreover, inspection can be carried without un-mounting the brake disk, which greatly simplifies in-service operation.

This technique is also appropriate to verify the component integrity during the manufacturing process. Using a rotary inspection head, the whole bolt volume could be evaluated with an angular resolution of 1º in just 15 seconds. This way, component quality can be guaranteed when it leaves the production line. The same inspection principle could be applied to steel rods, billets and pipes, with or without threads.

As DOF depends on focus range, and because thread defects can be present at any depth, this component cannot be correctly inspected with a single fixed focus. It was demonstrated that ProFoc® technique, available in all SITAU equipments, obtains the best possible lateral resolution at any depth, which guaranties defects detection at all ranges. Moreover, up to 16.384 focal points per image can be automatically calculated by ScanView® software, and no special configuration parameters are required. Hardware implementation of the focusing algorithm guarantees real time operation at high frame rates.


5. References


4. Links to equipment used


-          SITAU-311



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