in 《Modal sensor》--s1=lsqcurvefit('fun',a01,x0,y1);

[ZhenhongDu]

in 《Modal sensor》--s1=lsqcurvefit('fun',a01,x0,y1); Maybe I didn't find the definition of this function ‘fun’

[ZhenhongDu]

Is it a quadratic function

[WeisongZhao]

True, it should be a quadratic function.

[ZhenhongDu]

But sometimes the metric value do not like a quadratic function,It's more like a primary function（Linear increase）

[WeisongZhao]

YES. It would be not stable once the aberrations are larger than ~0.7 rad, but the overall tendency is true. Thus, we can use the Modal_sensor_new strategy to pre correct the large components (> 0.7 rad).