Implementation of a GPU accelerated total focusing reconstruction method within CIVA software

Rougeron, Gilles; Lambert, Jason; Яковлева, Екатерина; Lacassagne, Lionel; Domínguez, N.

doi:10.1063/1.4865067

Cited by 11 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The measurement range is expected to be increased with a larger sensor array to improve the imaging resolution as mentioned in Section 3.3, and therefore the feasibility of echo-PIV using DW-DAS for long-range and wide-view measurements was indicated. Furthermore, real-time measurements can be realized with the proposed method by speeding up the imaging [9] and PIV processing [10] steps for practical use.…”

Section: Resultsmentioning

confidence: 99%

Prototype of an Echo-PIV Method for Use in Underwater Nuclear Decommissioning Inspections

Kawachi¹,

Malkin²,

Takahashi³

et al. 2019

JFCMV

View full text Add to dashboard Cite

The ongoing decommissioning of the Fukushima Daiichi (1F) nuclear power plant requires the inspection of the inside of containment vessels that have been submerged in water. These inspections must locate leaks and map the distribution of fuel debris in water with very low visibility. This paper reports the design and testing of an echo-PIV system that uses a single divergent signal wave and delay-and-sum processing to efficiently map the interior and fluid flow within a submerged vessel. The diverging wave and delay-and-sum processing improve upon the performance of conventional ultrasound PIV methods specifically to meet the demands of containment-vessel inspections. The imaging method uses an ultrasonic linear sensor array that emits a diverging wave that covers a wide angle with a single transmission. The delay-and-sum algorithm combines echo signals recorded by each element of the sensor array. We optimized the design of an echo-PIV system in laboratory-scale tests, and then tested the prototype with a mockup of a containment vessel in a water tank. The small-scale prototype successfully located a mock leak and mapped the surface of a piece of mock debris. This prototype can be scaled up readily for inspections at the Fukushima Daiichi plant.

show abstract

Section: Resultsmentioning

confidence: 99%

Prototype of an Echo-PIV Method for Use in Underwater Nuclear Decommissioning Inspections

Kawachi¹,

Malkin²,

Takahashi³

et al. 2019

JFCMV

View full text Add to dashboard Cite

show abstract

“…The time does not change for other array sensors and can be shortened by optimizing the transmit interval in accordance with the target velocity. The total data processing time can be shortened by applying ideas from [12] and [13]. Consequently, the technique can potentially achieve a real-time or nearly real-time measurement.…”

Section: Resultsmentioning

confidence: 99%

A Study on 2-D Vector Flow Mapping by Echo-Piv With Total Focusing Method

Kawachi

Takahashi

Kikura

2018

Advances in Fluid Mechanics XII

View full text Add to dashboard Cite

Optical techniques have been applied for inspecting inside the primary containment vessels (PCV) in the decommissioning of the Fukushima Dai-ichi nuclear power plant. In this inspection, the following are required: determining fuel debris distribution and identifying location of leakage. Until this data, one of the inspections achieved great progress by capturing several images of fuel debris using a video camera but no information of the leak was unveiled due to non-clear water causing poor visibility of that camera. In order to identify the location of the leak, a new imaging method combining diverging wave (DW) and total focusing method (TFM), named DW-TFM was proposed aimed at echo (ultrasound)-particle image velocimetry (PIV) since an ultrasound can be used in opaque liquid and ultrasonic transducers are generally suited to high radiation levels. This imaging method uses an ultrasonic array sensor and emits a DW spreading in the distance from that sensor. The echo signal of tracer particles where the DW passed is captured by all the elements in the sensor at the same time and an echo image is then reconstructed from those signals using TFM algorithm. The imaging method is expected to obtain echo images covering a wide range in one transmission. Echo-PIV uses consecutive echo images captured at a certain interval to process them with PIV algorithm and obtain an averaged vector flow map (VFM). Summarizing the above, echo-PIV using the DW-TFM has the potential to visualize a wide range of flow behavior in real time and it allows the location of the leak to be found quickly. After investigating the imaging performance of the DW-PIV and developing a measurement system for the suggested echo-PIV, experimental measurement was conducted under a simple condition of water leaking from a tank in order to confirm its applicability. In this test, leaking position could be assumed from the measured VFM and it has good agreement with the actual leakage position. The achievability of the method for the leakage point detection is hereby presented.

show abstract

“…Increasing the speed of TFM imaging is therefore a hot research topic in non-destructive testing. For this purpose, computationally efficient post-processing algorithms can be applied [ 5 , 6 ], and computations within post-processing algorithms could be transferred to field-programmable gate arrays [ 7 , 8 ] or graphics processing units [ 9 , 10 ]. Another approach to increase the speed of TFM imaging is to use sparse arrays [ 11 ] when a limited number of elements are used to transmit ultrasonic waves and receive the reflected signals.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Sparse Matrix Phased Array Using Simulated Annealing for Volumetric Ultrasonic Imaging with Total Focusing Method

Dolmatov,

Zhvyrblya

2024

Sensors

View full text Add to dashboard Cite

The total focusing method (TFM) is often considered to be the ‘gold standard’ for ultrasonic imaging in the field of nondestructive testing. The use of matrix phased arrays as probes allows for high-resolution volumetric TFM imaging. Conventional TFM imaging involves the use of full matrix capture (FMC) for ultrasonic signals acquisition, but in the case of a matrix phased array, this approach is associated with a huge volume of data to be acquired and processed. This severely limits the frame rate of volumetric imaging with 2D probes and necessitates the use of high-end equipment. Thus, the aim of this research was to develop a novel design method for determining the optimal sparse 2D probe configuration for specific conditions of ultrasonic imaging. The developed approach is based on simulated annealing and involves implementing the solution of the sparse matrix phased array layout optimization problem. In order to implement simulated annealing for the aforementioned task, its parameters were set, the acceptance function was introduced, and the approaches were proposed to compute beam directivity diagrams of sparse matrix phased arrays in TFM imaging. Experimental studies have shown that the proposed approach provides high-quality volumetric imaging with a decrease in data volume of up to 84% compared to that obtained using the FMC data acquisition method.

show abstract

Implementation of a GPU accelerated total focusing reconstruction method within CIVA software

Cited by 11 publications

References 2 publications

Prototype of an Echo-PIV Method for Use in Underwater Nuclear Decommissioning Inspections

Prototype of an Echo-PIV Method for Use in Underwater Nuclear Decommissioning Inspections

A Study on 2-D Vector Flow Mapping by Echo-Piv With Total Focusing Method

Optimal Design of Sparse Matrix Phased Array Using Simulated Annealing for Volumetric Ultrasonic Imaging with Total Focusing Method

Contact Info

Product

Resources

About