Abstract: In order to solve the problem of traditional linear temperature sensing cables being unable to effectively locate and accurately warn fires in cable tunnels, a new type of digital linear temperature sensing detector is developed. On the basis of traditional temperature sensing cable technology, distributed insertion of fire protection chips is combined with existing thermosensitive materials for fire source localization and data processing; Applying multi-source data fusion and adaptive algorithms, considering environmental impacts, and integrating multiple types of data, accurate warning is achieved; Upgrade the output warning method, allowing multiple devices to observe real-time temperature and temperature cloud maps along the cable. After passing the technical index verification of the product, referring to national standards and cable tunnel environment, small fire source performance testing, differential temperature alarm performance testing, and boiling water testing were carried out. The results showed that the detector meets national standards, operates stably in humid and hot environments, and has strong reliability.

Key words: cable tunnels, digital line-type heat detectors, precise positioning, fire pre-alarm