Inductive pressure sensors are devices that measure pressure by detecting changes in the self-inductance or mutual inductance of a coil. These sensors can be categorized into three main types: self-inductive pressure sensors, differential self-inductive pressure sensors, and differential transformer (LVDT) pressure sensors. Each type operates based on different principles to convert mechanical displacement into an electrical signal.
The self-inductive pressure sensor is one of the most commonly used types. It comes in three variations: variable gap, variable area, and screw insertion. The variable gap type is particularly popular due to its sensitivity. Its basic structure includes a coil, a core, and an armature. When pressure is applied, it moves a measuring rod, which in turn displaces the armature. This movement alters the magnetic field around the coil, leading to a change in inductance. Once the coil is connected to a measuring circuit, this change in inductance is converted into a voltage, current, or frequency signal, allowing for accurate pressure measurement.
It's important to note that the relationship between the change in inductance and the change in air gap is nonlinear. This nonlinearity means that careful calibration is required to ensure accurate readings across the entire operating range of the sensor.
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Tag: Pressure sensor, Measuring rod, Working principle, Self-inductive coil
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