A sensor having a transmission line acting as a probe and an electronic circuit measures liquid levels. The sensor circuit uses a periodic signal generator to produce a carrier wave, which stimulates the transmission line, through a complex network coupling element. The complex impedance network forms a voltage divider with the transmission line, wherein the output of the voltage divider, is demodulated with an AM demodulator, such as a thermally compensated peak detector. This demodulated sig...
US-10018494-B2
US-10018494-B2 • July 2018 • Electronics & Technology
Temperature compensated transmission line based liquid level sensing apparatus and method