Lower limit frequency expansion system for non-contact measurement capacitive sensor
A technology of capacitive sensor and measurement cable, applied in the direction of changing the range circuit, etc., can solve the problems of difficulty in measuring the power frequency voltage of the transformer coil and the overvoltage of the long-wave tail operation, and achieve the effect of increasing the time constant and expanding the lower limit frequency.
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[0014] See Figure 1 to Figure 5 The present invention is realized through the following technical solutions.
[0015] In one embodiment
[0016] The capacitive sensor system of the present invention is composed of a capacitive sensor and a frequency band extender, among which:
[0017] The capacitance sensor is used to convert the high voltage signal of the transformer coil into a low voltage signal through the principle of capacitance voltage division;
[0018] One end of the frequency band expander is connected with the capacitance sensor, and the frequency band expander is used to increase the input impedance of the system and expand the lower limit frequency of the sensor.
[0019] In another embodiment
[0020] The capacitance sensor is a patch type capacitance sensor, the patch type capacitance sensor is composed of a sensing electrode, an insulating film and a BNC connector, the patch type capacitance sensor is surrounded by a metal shell; the middle of the BNC connector is a me...
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