Knowledge Centre
Primers, technology comparisons and selection guides for electrical tomography. Start with the fundamentals or jump straight to a selection guide.
ERT vs ECT: Which Should You Choose?
A comparison and selection guide for Electrical Resistance Tomography (ERT) and Electrical Capacitance Tomography (ECT): measurement principle, suitable media, sensor form and typical applications — four dimensions to quickly judge which technology fits your process-monitoring needs.
Read 20 May 2026What Is Tomography?
Tomography reconstructs the internal distribution of an object from boundary signals measured by sensors placed around it. This article covers the basic principle of industrial process tomography, its main branches (ECT / ERT / EMT / EIT) and typical applications.
Read 24 May 2026Measuring Phase Fraction with Tomography
Phase fraction is one of the most critical parameters in multiphase-flow measurement. This article explains how electrical tomography (ECT / ERT) is combined with EMA (effective medium approximation) models to infer the volume fraction of each phase in gas-liquid, oil-water and gas-solid two- and three-phase flows from electrode measurements.
Read 24 May 2026The Sensitivity Matrix in Electrical Tomography
The sensitivity matrix is the core mathematical tool linking boundary measurements to internal medium distribution in electrical tomography. It governs reconstruction quality, sensor selection and electrode-structure optimisation. This article covers its definition, two computation methods, its "soft-field" nature and its uses in engineering practice.
Read 15 Jun 2026ECT, ERT, EMT — Imaging Principle Comparison and Selection Guide
Electrical Capacitance Tomography (ECT), Electrical Resistance Tomography (ERT), and Electromagnetic Tomography (EMT) are the three mainstream electrical imaging technologies for industrial process monitoring. This article systematically compares them across four dimensions—measurement principle, applicable media, sensor form, and typical applications—and provides a quick selection decision tree together with practical engineering experience.
Read 18 Jun 2026电阻层析成像（ERT）技术详解
系统介绍电阻层析成像（ERT）的基本原理、电极阵列与数据采集策略、图像重建算法。涵盖ERT与ECT的区别对比、工业多相流监测与医学EIT临床应用，以及空间分辨率、三维成像等关键技术挑战与发展趋势。
Read 15 Jun 2026Custom Sensor Design Specification
Industrial process monitoring scenarios vary widely, and standard sensors often cannot fully meet all requirements. Tianjin Youyi Technology provides custom sensor design services. This document details the key parameters required for custom sensor design, for customers to fill in during the early project stage so our engineering team can quickly assess feasibility and propose optimal design solutions.
Read 18 Jun 2026电磁层析成像（EMT）技术详解
全面解析电磁层析成像（EMT）的工作原理——基于法拉第电磁感应定律与涡流效应。涵盖EMT线圈阵列结构、图像重建算法、与ECT/ERT的对比分析，以及EMT在液态金属流量测量、冶金连铸过程监测中的独特优势与技术挑战。
Read 24 Jun 2024ERT Applications in Gas-Liquid Two-Phase Flow Measurement
Learn how Electrical Resistance Tomography (ERT) is applied to gas-liquid two-phase flow measurement: principles, technical considerations, and typical applications. This article explains how ERT enables real-time monitoring of bubble dynamics, gas holdup, and flow regime identification through cross-sectional conductivity distribution.
Read 3 Jul 2026Resistivity Tomography, Resistance Tomography, and Electrical Impedance Tomography
A deep analysis of the technical commonality and application differences between resistivity tomography, resistance tomography, and electrical impedance tomography: from the unity of electromagnetic field theory and inversion theory to the differences in application objects and measurement circuits.
Read 2 Jul 2026ERT Linear Probe for Sand-Silt Sedimentation Monitoring
Learn how Electrical Resistance Tomography (ERT) linear probe is applied to sand-silt slurry sedimentation monitoring: principles, technical features, and implementation cases. This article explains how ERT linear probe enables real-time online monitoring of sediment layer thickness, sedimentation rate, and mud-water interface through vertical electrode arrays.
Read 18 Jun 2026电容层析成像（ECT）技术详解
深入讲解电容层析成像（ECT）的物理原理——基于介电常数差异实现多相流可视化。涵盖ECT传感器结构、微弱电容测量与数据采集系统、LBP/Landweber/Tikhonov等图像重建算法，以及ECT在油气水多相流、化工过程监测中的工业应用与技术挑战。
Read 3 Jul 2026Electrical Tomography vs. Ray Tomography: A Comparative Guide
A technical comparison between electrical tomography and ray tomography: from principles, applications, pros/cons, to selection guidelines. Electrical tomography offers radiation-free, low-cost, real-time monitoring; ray tomography provides high precision and resolution. They are complementary rather than competing.
Read 8 Jul 2026ERT Applications in Porous Media Testing
How Electrical Resistance Tomography (ERT) is applied to porous media material testing: from principles and applications to advantages. ERT enables real-time visualization of fluid distribution, permeability characteristics, and saturation changes in porous media—non-invasive, full-field measurement, real-time imaging.
Read 22 Jun 2026ECT Applications in Gas-Solid Two-Phase Flow
Electrical Capacitance Tomography (ECT) is a core technology for gas-solid two-phase flow measurement, widely used in fluidized beds, pneumatic conveying, cyclone separators, and other industrial processes. This article introduces ECT measurement principles in gas-solid systems, typical application scenarios, sensor selection guidelines, and common engineering challenges.
Read 8 Jul 2026What Are Soft Field and Ill-Posedness in Electrical Tomography
Two core concepts in electrical tomography: soft field characteristics and inverse problem ill-posedness. Understanding these concepts is key to mastering ET technology principles—soft field causes measurement nonlinearity, ill-posedness makes image reconstruction difficult. This article explains these two abstract concepts in plain language and introduces engineering coping strategies.
Read 8 Jul 2026ECT Applications in Robotic Embedded Sensing
Based on Tianjin University research: How Electrical Capacitance Tomography (ECT) is applied to robotic gripper embedded sensing. Introduces variable-spacing parallel-plate ECT sensors, dynamic calibration and reconstruction framework, XGBoost capacitance prediction model, enabling object detection and coarse localization for robotic grasping.
Read 7 Aug 2026Electrical Resistance Tomography for Concrete Non-Destructive Testing
Reinforcing steel, cracks, moisture gradients and chloride distributions in concrete all create conductivity contrast — the physical basis that lets Electrical Resistance Tomography (ERT) image the interior of concrete in 3D. Based on Karhunen et al. (2010) in Cement and Concrete Research, this article introduces the principle, experiments and results of ERT for concrete NDT, and the outlook for rebar localisation, crack-depth estimation and moisture mapping.
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