Coaxial thermocouple cold junction temperature measuring device and system

The invention discloses a coaxial thermocouple cold junction temperature measuring device and system. The coaxial thermocouple cold junction temperature measuring device comprises a connector, a temperature measuring sensor, a heat conducting medium and a heat insulating layer, wherein the connector comprises a shell and a core disc, and the core disc is fixed in the shell; cold ends of the plurality of coaxial thermocouples are respectively connected to the core disc; the temperature measuring sensor is connected to the core disc; the heat conducting medium is filled in the shell and wraps the temperature measuring sensor, the cold ends of the coaxial thermocouples and the core disc, and the heat insulating layer wraps the heat conducting medium. The cold end measurement precision of thecoaxial thermocouple is improved, the cold end measurement volume is reduced, and the flight test environment measurement requirement can be met. 本发明公开了一种同轴热电偶冷端温度测量装置及系统，包括：接插件、测温传感器、导热介质及绝热层；接插件包括外壳和芯盘，芯盘固定于外壳中；多个同轴热电偶的冷端分别