A system for expanding the lower limit frequency of capacitive sensors for non-contact measurement
A technology of capacitive sensor and measurement cable, which is 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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[0019] see Figure 1 to Figure 5 , the present invention is achieved through the following technical solutions.
[0020] in one embodiment
[0021] The capacitive sensor system of the present invention is made up of capacitive sensor, frequency band extender, wherein:
[0022] The capacitive sensor is used to convert the high-voltage signal of the transformer coil into a low-voltage signal through the principle of capacitive voltage division;
[0023] One end of the frequency band expander is connected to the capacitive 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.
[0024] in another embodiment
[0025] The capacitive sensor is a chip-type capacitive sensor, and the chip-type capacitive sensor is composed of a sensing electrode, an insulating film and a BNC connector, and the periphery of the chip-type capacitive sensor is wrapped with a metal shell; the middle of the BNC co...
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