We have developed an automatic algorithm to detect the skin profiles in the volumetric data acquired by photoacoustic microscopy for subcutaneous vasculature imaging. This algorithm analyzes the relationship between amplitudes of photoacoustic signals generated from the skin surface and underlying blood vessels to achieve a rough estimation of the skin profile. A better approximation of the ski...

The multilayer structure of fiber-reinforced polymers may be extracted by ultrasonic pulse-echo inspection. Depending on the employed frequency and subsequent processing methodology, different depth resolution dynamic range can achieved. This study compares performance approaches for extracting ply-by-ply multilayered composites. following methodologies are studied: Method 1: 50 MHz, 15 5 MHz u...

Conventionally, the ultrasonic polar scan (UPS) records the amplitude or time-of-flight in transmission using short ultrasonic pulses for a wide range of incidence angles, resulting in a fingerprint of the critical bulk wave angles of the material at the insonified spot. Here, we investigate the use of quasi-harmonic ultrasound (bursts) in a polar scan experiment, both experimentally and numeri...

Ultrasonic appearance probably indicative of imminent fetal death One of the difficulties in recognising fetal death by ultrasonic scanning in early pregnancy is that the negative finding of no fetal heart movement must always be less convincing than a positive finding. Furthermore, Robinson' found only one instance of irregularity of the fetal heart in ten cases scanned before their pregnancie...

Unilateral exophthalmos is an important clinical ophthalmic problem. A clinical diagnosis of the cause of the exophthalmos is often very difficult. B-scan ultrasonography is an important new diagnostic modality with great potential in determination of the nature of orbital pathology. The earliest ophthalmic applications of ultrasound were reported by Mundt and Hughes (I956). A-scan ultrasound, ...

Elevated temperature, gamma radiation, and geometric constraints inside dry storage casks for spent nuclear fuel represent a harsh environment for nondestructive inspection of the cask and require that the inspection be conducted with a robotic system. Electromagnetic acoustic transducers (EMATs) using non-contact ultrasonic transduction based on the Lorentz force to excite/receive ultrasonic w...

Improvement of nondestructive inspection techniques has made more frequent the detection zones containing closely spaced non-metallic inclusions in pressure vessels low carbon steel. In present study, an in-service cylindrical horizontal vessel were detected by Scan-C ultrasonic and considered as laminations to be assessed Part 13 API 579-1/ASME FFS-1 2016 standard. The outcoming results reject...

This paper presents a study about the amplitude of ultrasonic echoes and a simple model is proposed to predict the shape and amplitude of echoes received from different materials in environments composed of walls and corners. Using this model is possible to distinguish between walls and corners, in a single circular scan of a single ultrasonic transducer pair. The parameters of the model have b...

Abstract Composite materials are more and widely used in aircraft structural design, impact damage is the most serious defect/damage form of aviation composite structures service. Therefore, it great significance to study resistance composites with different forms for design. In this article, reinforced fiber/resin laminates unidirectional carbon fiber prepreg (UIN23100), woven fabric (W-3021FF...