Freezing point temperature of pavement road surface is an important pavement of highway meteorological parameters. At present,the temperature characteristics of snow-melting agent solutions are not yet understood,which affects the research and fabrication of high-precision road freezing point temperature sensors. So,automatic test system (ATS)for temperature characteristics of snow-melting agent solution is designed and prepared based on phase locked amplification technology. A computer-controlled hardware system for automatic detection of snow-melting solution parameters is constructed using a phase locked amplification,AC current source,and a two electrode solution pool. The solution temperature is detected using a developed 4-wire high-precision Pt100 temperature sensor. Communication between the upper computer,phase locked amplification,and temperature sensor module is achieved based on MATLAB. The upper computer also has functions such as real-time data acquisition,filtering,storage,and real-time visualization drawing. The test system and test results will provide important data support and reference for the research and fabrication of road surface freezing point temperature sensors.
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