Compensation method and compensation circuit for a non-contact sensor

Abstract

The invention discloses a compensation method and a compensation circuit for a non-contact sensor. The compensation method for a non-contact sensor specifically includes the steps of: presetting a reference judgment capacitance value C0 and obtaining a reference voltage VT; obtaining a real-time changing voltage VT1, The magnitude of the variable voltage VT1 is related to temperature; compare the magnitude of the variable voltage VT1 and the reference voltage VT, and correct the judgment capacitance value C3 according to the comparison result; the compensation method of the non-contact sensor provided by the present invention can be based on the external environment. The temperature change condition corrects the judgment capacitance value of the non-contact sensor, reduces the probability of misjudgment by the non-contact sensor, and improves the detection accuracy of the non-contact sensor.

Description

technical field [0001] The invention relates to the technical field of non-contact sensors, in particular to a compensation method and compensation circuit of a non-contact sensor. Background technique [0002] The existing non-contact sensor mainly uses the capacitive sensing principle to detect the liquid level, but in the process of detecting the liquid level of the non-contact sensor, due to the fluctuation of the external ambient temperature, its judgment capacitance value will be affected by the temperature. When the external conditions are consistent, such as the detected liquid level is the same, due to the difference in the judgment capacity, there will be two different judgment results, that is, there is a possibility of misjudgment, which reduces the detection of the non-contact sensor. Accuracy. [0003] It can be seen that the existing technology still needs to be improved and improved. SUMMARY OF THE INVENTION [0004] In view of the above-mentioned shortco...

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Problems solved by technology

[0002] Existing non-contact sensors mainly use the capacitive sensing principle for liquid level detection, but in the process of non-contact sensor detection of liquid level, due to fluctuations in the external environment temperature, its judgment capacitance will change due to the influence of temperature, In the case of consistent external conditions, if the detected liquid level is consistent, there will be two different judgment results due to the different judgment capacity, that is, there is a possibility of misjudgment, which reduces the detection of non-contact sensors. Accuracy

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