Non-invasive liquid level detection with dielectric capacitive method

This paper presents a dielectric capacitive non-invasive liquid level detection method and device without the needs of physical quantity sampling. The procedure is that, by using a tiny electric field without destroying the system structure and state, immediately and continuously to research the internal message of the material. It overcomes the measurement limits of optically turbid samples or colored samples and does not affect the nature of the tested liquid. The device can be applied to the medical liquids or isolation and risk liquid. Meanwhile, this method can solve the insecurity problem caused by the invasive or contact detection methods.