Linearity is a parameter that measures the degree to which the actual relationship between the output and input of a sensor deviates from an ideal straight line, and is also known as non-linearity error. Its value is calculated as the maximum deviation of the calibration curve from the fitted straight line, expressed as a percentage of the full-scale output value (ΔYmax/Y × 100%), and a smaller value indicates better linear characteristics of the sensor [2]. As one of the core indicators of static characteristics, linearity, along with sensitivity, hysteresis, etc., constitutes the performance evaluation system of the sensor [1]. In industrial control, biomedical monitoring, and other scenarios, maintaining excellent linearity can effectively improve measurement accuracy and simplify the calibration process.