本文介绍离子感烟电离室的发展，着重阐述单源双室电离室的工作原理，讨论并评述其主要优缺点，并指出离子感烟电离室进一步发展的若干新动向。本文也有助于理解近几年来日本的能美、日探和报知机等大公司不再生产双源双室离子感烟火灾探测器，而以单源双室离子感烟火灾探测器取而代之的原因。 This article describes the development of ion-based smoke ionization chambers, focuses on the working principle of single-source dual-chamber ionization chambers, discusses and comments on their main advantages and disadvantages, and points out some new trends in the further development of ion-based smoke ionization chambers. This article also helps to understand the reasons why large-scale Japanese companies such as Nomi, Japan Exploration and Signal Processing Machines no longer produce dual-source dual-chamber ion smoke detectors in recent years, but replaced them with single-source dual-chamber ion smoke detectors.