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| Design of Liquid Concentration Measuring Device Based on Force Sensor |
| KONG Deming，DING Ｒuixue，XUE Zhengyang，LIU Yanqun，XU Fuxin，HE Biao *
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| School of Physics，Central South University，Changsha 410083，China |
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Abstract Based on high-precision force-sensitive sensors and STM32 microcontrollers，this study established a corresponding relationship between " the concentration，density，and buoyancy" of solutions．The changes in buoyancy were accurately measured by using force-sensitive sensors，and a liquid concentration measurement device was developed．After completing the design of the device，it was used to measure the concentration of sodium chloride，sodium carbonate，copper sulfate，and alcohol solutions，and the measurement results showed a deviation from the actual concentration of generally less than 0．3%，indicating a high measurement accuracy of the device．
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Published: 25 October 2025
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