Liquid level estimation method based on frequency domain information fusion

• Main Authors: HUANG DARONG, LI GUO, XU XIAOBIN, FANG DANFENG, LI JIANNING
• Format: Patent
• Language: Chinese; English
• Published: 27.02.2018
• Subjects: MEASURING; MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL; METERING BY VOLUME; PHYSICS; TESTING

The invention discloses a liquid level estimation method based on frequency domain information fusion. According to existing measurement methods, due to errors in microphones and analog-digital converters and the influences of the surrounding environment, the measurement precision is poor. A sound guiding pipe is inserted to the bottom of liquid to be detected in the direction perpendicular to a liquid surface, a loudspeaker emits sound waves changing evenly, and a microphone collects composite waves. Regarding the liquid levels at the same altitude, two groups of data are continuously collected, and Fourier transform and frequency character extraction are conducted on the two groups of data separately to obtain two groups of resonant frequency. Supporting intervals and trust intervals areset for each resonant point in the two groups of resonant frequency sequences, meanwhile assignment is conducted, and a DS combination rule is utilized to conduct fusion to obtain a resonant point sequence after fusion. Diff