one of the challenges in non-destructive testing schemes using the ultrasound pulse-echo technique is to identify those defects whose sizes are less than or equal to the detection resolution that is dependent on the width of the ultrasound pulse. existing methods also require a reference specimen of the same defective material, which may not be available in some cases. we present a new method f...

Over the past few years, the improvement in the field of ultrasonic non-destructive testing has led to significant advances in ultrasonic signal processing and image construction techniques. Many techniques have been proposed to improve the flaw and crack detection processes. In general, these techniques can be divided into two main parts. As first, many proposals have been focused on construct...

Nowadays, the better performance of lightweight structures during earthquake has resulted in using lightweight concrete more than ever. However, determining the compressive strength of concrete used in these structures during their service through a none-destructive test is a popular and useful method.  One of the main methods of non-destructive testing in the assessment of compressive strength...

the importance of iranian ancient as architectural heritage have to competent international prestige a nd respect due this is important with regard to proper conservation met hods based on non-destructive evaluation methods and non-contact testing providing enough accuracy and speed to bri ng performance to stabilize while correct location and age value of valuable architectural aspect of quant...

The scattering and reflection of ultrasonic pulses is the basis for ultrasonic non-destructive testing techniques. However problems are encountered in the interpretation of experimental results in many systems especially those which have target dimensions of the order of a wavelength, where there are no analytical solutions. It is shown that the lack of an adequate analytical theory can be over...

One of the ways how to rationalize the experimental work is to put to use the non-destructive testing methods. In case of the strength testing of the various age cement specimens the usage of the ultrasonic pulse method appears to lead to decrease the necessary amount of tested samples. Application of this method requires fixed initial conditions like constant proportion of components, identica...

This paper describes the integration of an ultrasonic-based non-destructive testing (NDT) with wireless sensor networks (WSNs) to continuously monitor material integrity during run-time. NDT is a technique that allows the examination of material properties without causing any damage to the material in the process. A wireless sensor network facilitates the collaborative effort to monitor a certa...

-This paper describes comparison between our developed two Non-Destructive Testing (NDT) system with ultrasonic method and pulse-radar method. These systems could provide information of embedded objects in concrete structure. First, we introduce these NDT systems. The raw output images of these methods keep us from understanding them. To overcome this problem, we apply fuzzy logic into them. Ne...

The acoustic modality yields non destructive testing techniques of choice for indepth investigation. Given a precise model of acoustic wave propagation in materials of possibly complex structures, acoustical imaging amounts to the so-called acoustic wave inversion. A less ambitious approach consists in processing pulse-echo data (typically, Aor B-scans) to detect localised echoes with the maxim...