Image reconstruction methods for two-phase stratified flow with incomplete data of ERT

When ERT is applied to measure the stratified flow constituted of gas and liquid, some electrodes of it may be covered by the air, which will prevent the image reconstruction. To solve this problem, two methods are proposed, which include the reconstruction method based on the valid data and the reconstruction method based on the new sensitivity field. As the invalid electrodes can be decided from the measurements, the first method uses the judgment method to ascertain the invalid measurements, and reconstructs images with valid measurements. The second method takes the features of stratified flow as prior information and calculates new sensitivity field after the invalid electrodes are judged. The area that covered by the invalid electrodes is removed, and the image reconstruction is only considering the area that is surrounded with the valid electrodes. It can reduce the number of unknown and is wished to improve the reconstruction quality. Simulation and experimental results of the stratified flow show the effectiveness of two methods. ©, 2014, Science Press. All right reserved.