Tunable diode laser absorption spectroscopy (TDLAS) tomography has been widely used for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i> combustion diagnostics, yielding images of both species concentration and temperature. The temperature image is generally obtained from the reconstructed absorbance distributions two spectral transitions, i.e., two-line thermometry. However, inherently ill-posed nature tomographic data inversion...

Acoustic tomography can be used to measure the temperature field from time-of-flight (TOF). In order capture real-time changes and accurately yield quantitative images, two improvements conventional acoustic system are studied: simultaneous transmission TOF collection along multiple ray paths, an offline iteration reconstruction algorithm. During operation, all transceivers send modulated filtered wideband Kasami sequences simultaneously facilitate fast accurate measurements using...

Tomographic imaging based on acoustic wave time-of-flight (TOF) measurement is considered to be a promising technique for monitoring temperature fields due it being noninvasive, relatively low cost, having high temporal resolution, and easy use. Accurate estimation of the TOF key in improving quality reconstructed images. In this paper, an improved method Akaike information criterion (AIC) developed. Two improvements are studied comparison conventional weighted AIC methods against crosstalk...

Acoustic tomography can deliver accurate quantitative reconstruction of the covered temperature distribution with low equipment cost. For application real-time field monitoring, both temporal resolution and speed are great significance. In this article, we developed a novel online time-resolved (OTRR) method, which improve to capture dynamic changes accelerate tomographic process for monitoring. First, by exploiting redundancy information, regularization is designed based on adaptive auto...

Acoustic tomography is considered to be a promising technique for temperature field monitoring, with the advantage of non-invasive, low cost, high temporal resolution and ease use. However, in combustion process, gradient could relatively large, therefore commonly used straight ray acoustic may not able provide accurate quantitative estimation due refraction effect. In this paper, bent model nonlinear reconstruction algorithm applied, which allows sound propagation trajectories distribution...

This paper develops a size-adaptive hybrid meshing scheme for Chemical Species Tomography (CST) that is driven by the customized spatial resolution of sensing region. Traditionally, entire region in CST uniformly discretized with empirically determined density meshes. Such discretization results a) waste computational efforts on less spatially resolved location; and b) much severer rank deficiency. To solve above-mentioned issues, we introduce, first time, CST. Driven resolution, dense...

Abstract Ultrasound tomography (UT) is a promising sensing technique for industrial processes owing to its advantages non-invasive, low cost, implement flexibility. Traditional UT may lack the distinguishability resolve flow with complicated distribution. We propose method that exploits multi-frequency information improve spatial resolution and different inclusions. Firstly, ultrasound attenuation measurement was collected demodulated tomographic reconstruction. Secondly, hybrid...

Industrial ultrasonic tomography (UT) possesses unique advantages in visualizing multiphase medium and has received broad attention the past decades. Facing small bubble distribution imaging, current independent-transducer-based UT faces bottleneck problems of limited projection number large diameter. To image cross-sectional distribution, an original concept phase array (UPAT) is proposed by introducing ultrasound (UPA) transducers novel designed sensing strategy into UT. The UPAT emits a...

Ultrasonic techniques have been widely used to determine the volume fractions of liquid components in oil&#x2013;water two-phase flow. The two major ultrasonic interactions amenable fraction estimation are sound speed and attenuation. Instead using these linear ultrasound parameters, this study explores use nonlinear parameter measure Based on theoretical modeling propagation nonlinearity measurement principle finite amplitude insertion substitution (FAIS), we established a relationship...

Tunable Diode Laser Absorption Spectroscopy (TDLAS) tomography has been widely used for in situ combustion diagnostics, yielding images of both species concentration and temperature. The temperature image is generally obtained from the reconstructed absorbance distributions two spectral transitions, i.e. two-line thermometry. However, inherently ill-posed nature tomographic data inversion leads to noise each distributions. These effects propagate into ratio generate artefacts retrieved...

Oil–gas–water three-phase medium is frequently encountered in various industrial processes. A comprehensive understanding of the discrete phase great importance for process safety assurance and economic benefits production. Concerns about not only refer to spatial resolution but also acoustically distinguish gas bubble oil droplet. We present a novel ultrasonic measurement technique using phased array (UPA) sensor complex sound pressure accomplish this goal. The proposed method can...

Hydrogen fuel cell vehicles have significant advantages over traditional in energy saving and environmental protection. In the external circulation line of reaction device, hydrogen exists form wet gas. High-precision measurement gas parameters a small diameter pipe can provide useful flow state information for monitoring state, adjusting supply strategy maintaining stable operation system. However, sensor design quantification liquid phase influence are challenging problems diameter. To...

In chemical and food industry, the fluid concentration distribution inspection plays a key role in control of production processes. To meet requirement process by-product reaction suppression advanced measurement techniques are highly desired. Due to its nondestructive non-radiation features, Ultrasonic tomography (UT) is considered as promising technique for monitoring sucrose solution container, yielding images both sound velocity concentration. this paper, we investigate potential using...

Ultrasonic flowmeter has been widely used in chemical industry, metallurgy, and oil industry due to the advantage of highly accurate, non-invasive, no pressure loss nature. However, some harsh measurement scenarios like hydrogen recycling loop downhole energy fluid transportation, it may lack accuracy resolve small flow rate change. Traditional Time-Of-Flight (TOF) estimation methods ultrasonic flowmeters tend show low robustness these which often signal-noise ratio with a lot noise...