An improved cable tension sensor with double by-pass excitation is discussed based on measurement principle of magneto-elastic cable tension sensor.Magnetic circuit analysis of double by-pass cable tension sensor’s structure is carried out by calculating magnetic resistance.After researching the design of the double by-pass sensor

the design principles of the sensor’s structure and the design method of the sensor’s coil parameters are proposed.Considering the residual magnetism effect of cable material

plus-minus impulse current is adopted to excite magnetic field.The sensor’s operating point is optimized according to the material characteristics of cable material’s magneto-elastic effect.Tension experiments of double by-pass magneto-elastic cable tension sensor are carried out.The result indicates that the sensitivity of double by-pass magneto-elastic cable tension sensor is 0.070 1 mV/MPa and the repetitive error is less than 0.49 %.The design of sensor

the election of magnetization method and the optimization of operating point are reasonable.The double by-pass magneto-elastic cable tension sensor is suitable for cable tension measurement.