Magnetic field sensors often use coils made of wound wire. These coils can be either spiral wound or flat coils, depending on the application requirements. The coil winding configuration and the choice of wire material will affect the sensitivity and output signal characteristics of the sensor.

   - Spiral-wound coils: A spiral-wound coil is a coil in which the wires are tightly wound around a central axis, forming a helix. This type of construction is typically used to detect changes in magnetic fields close to the center axis of the coil, such as in proximity switches and magnetic field measurements.

   - Planar Coil: A planar coil is a coil in which the wire is wound into a flat shape. This structure is typically used to detect changes in magnetic fields within a plane, such as in geomagnetic sensors and magnetic resonance imaging.

Some temperature sensors use a wound wire as the sensitive element, commonly platinum resistance thermometers and thermistors. The resistance of the wire varies with temperature and the ambient temperature is determined by measuring the resistance value. When winding the lead wires, materials with good high-temperature tolerance, such as copper, nickel, platinum, etc., are often used.



Some pressure sensors use a wound wire as the sensitive element. When subjected to the action of pressure, the wound wire may undergo deformation, thereby changing its resistance or capacitance and other characteristics. These changes can be measured by measuring the resistance or capacitance values to obtain the corresponding pressure information.

Some optical sensors use the wound wire as a photosensitive element, such as a photoresistor or photodiode. Winding wire may have the characteristics of photosensitive materials, when exposed to light, its resistance or capacitance and other parameters will change, so as to realize the detection and measurement of light signals.

Some gas sensors use a wound wire as the sensitive element, commonly metal oxide semiconductor (MOX) sensors. When a specific gas is present, the resistance of the wound wire changes and the gas concentration is detected by measuring the resistance value.

The design and manufacture of the wirewound requires consideration of the sensor's operating principle, sensitivity requirements, environmental impacts, and the selection of the wire material. High performance and reliable sensor applications can be realized through proper wire winding design and manufacturing.