Anti-electromagnetic interference capacitive oil mass measuring method and system thereof

Abstract

The invention discloses an anti-electromagnetic interference capacitive oil mass measuring method and a system thereof. The method comprises the steps of S1, covering a capacitive sensor for measuring oil mass with one or more metal shielding layers, S2, measuring the capacitance of the capacitive sensor and outputting an analogue voltage signal according to the capacitance, and S3, converting the analogue voltage signal into a digital signal for outputting. The system comprises the capacitive sensor with the metal shielding layers, an operational amplifier and an analog-digital converter. According to the anti-electromagnetic interference capacitive oil mass measuring method and the system thereof, the electromagnetic compatibility problem of the capacitive sensor is solved from the following two aspects: firstly, the capacitive sensor is completely isolated from the external electromagnetic environment by use of the metal shielding layers so as to guarantee the accuracy of the measured data; secondly, the digital signal is output instead of the analog signal, and the reliability of the signal is enhanced and the anti-interface capability of the signal is improved. The anti-electromagnetic interference capacitive oil mass measuring method and the system thereof can be widely applied to various capacitive oil mass measuring systems.

Description

technical field [0001] The invention relates to the field of oil volume measurement, in particular to a capacitive oil volume measurement method, and also relates to a capacitive oil volume measurement system. Background technique [0002] Capacitive fuel level sensors are widely used in aircraft fuel measurement systems, but there are also some electromagnetic compatibility problems in practical applications, which are easily affected by electromagnetic radiation such as aircraft short-wave radio stations, resulting in jumps in test data or inaccurate measurements. . Failure to pass the RS103 (electric field radiation sensitivity) EMC test is a common problem for existing products. Some products can only complete the test by reducing the test severity, which leads to many problems exposed in the actual application environment. [0003] The main reason for these problems is derived from the measurement principle of the capacitive oil sensor. The capacitive plate of the exis...

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Problems solved by technology

[0005] (1) The capacitive sensor has no EMC (electromagnetic compatibility) protection design, and the collected original signal is easily affected by the surrounding electromagnetic environment, and the signal will fluctuate to a large extent;

[0006] (2) The output of the sensor is an analog signal, which is also easily affected by electromagnetic interference on the signal transmission cable

[0007] Since the measurement accuracy is easily affected by electromagnetic interference, it is more difficult to process the post-stage signal, and the existing capacitive measurement system basically cannot pass the RS103 electromagnetic compatibility test

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