The sensitivity of inductive self-inductive sensors is related to those factors? What measures can be taken to improve sensitivity? What are the consequences of using these measures?

In terms of increasing sensitivity, the following measures can be taken, with the attendant disadvantages:

1, the use of differential structures can increase sensitivity by a factor of one compared to single inductive types. This leads to a complex sensor structure.

2, avoid hollow inductors and use iron core inductors with greater inductance variation for the same measured variation. This leads to an increase in coil size and weight, which is not conducive to miniaturization; at the same time, the use of the temperature range is limited to the Curie temperature of the core material below.

3, the sensitivity of the self-inductive sensor itself (ΔL/Δmeasured) is an inversely proportional function, so the sensitivity is highest when the measured value is close to zero. This limitation makes the range reduced.

4, the coil DC resistance is reduced by using the thickest possible wire diameter. This leads to increased size and cost and is rarely used.

5, self-sensing sensor sensitivity increased, the influence of external stray magnetic field interference is also exacerbated, which requires additional magnetic shielding design. This leads to cost, limited range of use.