Frequency domain sensor

Frequency domain sensors (FDS) are a particular case of sensors. They convert a measurand into a frequency domain output. A frequency output signal has some outstanding characteristics like output of quasi-digital signals, high sensitivity, high resolution, wide dynamic range, antiinterference capacity and good stability. There are sensors based on capacitive, inductive or resistive effects, such sensors when are connected on a specific array and they produce a frequency output. Specifically, FDS are built of piezoelectric materials (for example quartz) and they only need to be connected in a specific circuit, to generate a stable and continuous frequency output.