Capacitive sensor

Details Capacitive sensor Capacitive sensor

G - Physics

01

R

G01R 27/26 (2006.01) G01R 1/36 (2006.01) G01V 3/08 (2006.01) H03K 17/955 (2006.01)

Patent

CA 2165631

A capacitive sensor comprises capacitance sensing means (1) and oscillator means(2), for measuring capacitive changes, the oscillator means (2) comprising a unity gain buffer (3) for buffering the voltage over the capacitance sensing means (1)without imposing any load on the latter, the output terminal of the unity gain buffer (3) being connected to the input terminal of charging means (4) for charging anddischarging the capacitance sensing means (1) via a resistor (5) which is connected to the capacitance sensing means (1) and to the output of the charging means (4), the capacitive sensor further comprising guard means (7) connected to the output of the unity gain buffer (3) and arranged to at least partially surround the capacitance sensing means (1) to shield the capacitance sensing means (1) from capacitive changes caused by interferential action. In order to provide sensitivity of the capacitance sensing means (1) just in the desired direction and so as to prevent large static charges from discharging the capacitance sensing means (1) in order not to destroy the sensitive input of the unity gain buffer (3) of the oscillator means (2) by the resulting ESD transient, a protective means (13) is connected between the capacitance sensing means (1) and the guard means (7).

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