Electrical capacitance tomography with airflow injection system (ECT-AIS) has been developed for controlling particle distribution in pneumatic conveyance in order to maintain homogeneous downstream particle distribution ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ with a delay time τ even under inhomogeneous upstream particle distribution ${\epsilon }_n^{\mathit{up}}\left(t\right)$. ECT-AIS is composed of two ECT sensors for monitoring ${\epsilon }_n^{\mathit{up}}\left(t\right)$ and for evaluating ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ after injecting airflow. The airflow is injected to the conveyance pipe by activating a solenoid valve of airflow injection system (AIS) to control the homogeneous ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ in the case that the spatial standard deviation of permittivity distribution at the upstream ECT sensor ${\epsilon }_{\mathit{SD}}^{\mathit{up}}\left(t\right)$ which is calculated from ${\epsilon }_n^{\mathit{up}}\left(t\right)$ and the spatial mean permittivity $〈{\epsilon }_n^{\mathit{up}}〉\left(t\right)$ is greater than the threshold value δ. With this developed ECT-AIS, three different experiments are performed under different particle loading ratios (ϕ = 0.25, 0.50 and 0.75) with air flow rate Q_a = 0.75 kg/s, 0.50 kg/s and 0.25 kg/s. As ${\epsilon }_n^{\mathit{up}}\left(t\right)$ is homogeneous, ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ is also homogeneous. While ${\epsilon }_n^{\mathit{up}}\left(t\right)$ was inhomogeneous, ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ was homogeneously distributed due to airflow injection. To evaluate the homogeneity of ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$, the spatial mean permittivity $〈{\epsilon }_n^{\mathit{up}}〉\left(t\right)$ in upstream sensor is compared with $〈{\epsilon }_n^{\mathit{do}}〉\left(t+\tau \right)$ in downstream sensor and the two results were evaluated with the measured pressures $p_n^{\mathit{up}}\left(t\right)$ and $p_n^{\mathit{do}}\left(t\right)$. As a results, ${\epsilon }_{\mathit{SD}}^{\mathit{do}}\left(t+\tau \right)$ is less than or equal to δ so that $〈{\epsilon }_n^{\mathit{do}}〉\left(t+\tau \right)$ is homogeneous after airflow injection. Based on Darcy–Weisbach equation, as the particles are homogeneous, the pressure is lower than that in inhomogeneous distribution. According to the relationship between mean permittivity and pressure, ${\epsilon }_n^{\mathit{do}}\left(t+\tau \right)$ is successfully controlled in homogeneous conditions by ECT-AIS.

已经开发了带有气流注入系统的静电层析成像技术（ECT-AIS），用于控制气动输送中的颗粒分布，以保持下游颗粒的均匀分布 ${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$即使在上游颗粒分布不均匀的情况下也具有延迟时间τ${\epsilon }_{ñ}^{\mathit{向上}}\left(Ť\right)$。ECT-AIS由两个用于监控的ECT传感器组成${\epsilon }_{ñ}^{\mathit{向上}}\left(Ť\right)$ 和评估 ${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$注入气流后。通过激活气流喷射系统（AIS）的电磁阀以控制均匀性，将气流喷射到输送管中${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$ 在上游ECT传感器的介电常数分布的空间标准偏差的情况下 ${\epsilon }_{\mathit{标清}}^{\mathit{向上}}\left(Ť\right)$ 根据 ${\epsilon }_{ñ}^{\mathit{向上}}\left(Ť\right)$ 和空间平均介电常数 $〈{\epsilon }_{ñ}^{\mathit{向上}}〉\left(Ť\right)$大于阈值δ。使用此开发的ECT-AIS，在 空气流量Q _a  = 0.75 kg / s，0.50 kg / s和0.25 kg / s的情况下，在不同的颗粒负载率（ϕ = 0.25、0.50和0.75）下进行了三个不同的实验。如${\epsilon }_{ñ}^{\mathit{向上}}\left(Ť\right)$ 是同质的 ${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$也是同质的 而${\epsilon }_{ñ}^{\mathit{向上}}\left(Ť\right)$ 是不均匀的 ${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$由于气流注入而均匀分布。评估的同质性${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$，空间平均介电常数 $〈{\epsilon }_{ñ}^{\mathit{向上}}〉\left(Ť\right)$ 在上游传感器中与 $〈{\epsilon }_{ñ}^{\mathit{做}}〉\left(Ť+\tau \right)$ 在下游传感器中，并用测得的压力评估这两个结果 $p_{ñ}^{\mathit{向上}}\left(Ť\right)$ 和 $p_{ñ}^{\mathit{做}}\left(Ť\right)$。结果，${\epsilon }_{\mathit{标清}}^{\mathit{做}}\left(Ť+\tau \right)$小于或等于δ，因此$〈{\epsilon }_{ñ}^{\mathit{做}}〉\left(Ť+\tau \right)$气流注入后是均匀的。基于Darcy–Weisbach方程，由于颗粒是均质的，因此压力低于非均匀分布的压力。根据平均介电常数和压力之间的关系，${\epsilon }_{ñ}^{\mathit{做}}\left(Ť+\tau \right)$ 通过ECT-AIS在均匀条件下成功控制。