System and method for capacitive measuring
First Claim
1. System (S, S′
- ) for non-contact measurement of a relative displacement or of a relative position of a first object with respect to a second object, comprising;
a sensor module (1) comprising a transmitting plate (T) fixed to said first object and a receiving plate (R) connected to said second object, said first transmitting plates and said second receiving plate being arranged substantially facing each other and provided with transmitting and receiving electrodes respectively, means (22) of applying high-frequency excitation signals to said transmitting electrodes, means of taking high-frequency modulated measurement signals from said receiving electrodes, and means (2,500) of processing said measurement signals thus taken in order to supply signals representing the relative displacement or the relative position of said first object with respect to said second object, characterized in that the transmitting and receiving electrodes are arranged to constitute a first capacitance varying as a function of the distance separating the transmitting and receiving plates respectively and a second capacitance varying as a function of the relative misalignment of said plates, and in that the processing means are designed to perform, on the basis of the measurement signals taken, an analogue calculation (i) of a first signal representing the inverse of said first capacitance and (ii) of a second signal representing the ratio of the second capacitance to said first capacitance.
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Accused Products
Abstract
A system (S′) for non-contact measurement of a relative displacement or relative position of a first object relative to a second object, has: a sensor module including a transmitter plate fixed to the first object and a receiver plate connected to the second object, arranged substantially facing each other and provided with respectively transmitting and receiving electrodes; and an electronic module designed to apply on the transmitting electrodes high-frequency excitation signals, and to process measurement signals derived from the receiving electrodes. The transmitting and receiving electrodes are designed to constitute a first variable capacitance based on the relative misalignment of the plates. The electronic module is designed to perform an analog calculation of a first signal representing the inverted capacitance and of a second signal representing the ratio of the second capacitance over the first capacitance. The invention is in particular useful for controlling segmented mirrors in large telescopes.
61 Citations
26 Claims
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1. System (S, S′
- ) for non-contact measurement of a relative displacement or of a relative position of a first object with respect to a second object, comprising;
a sensor module (1) comprising a transmitting plate (T) fixed to said first object and a receiving plate (R) connected to said second object, said first transmitting plates and said second receiving plate being arranged substantially facing each other and provided with transmitting and receiving electrodes respectively, means (22) of applying high-frequency excitation signals to said transmitting electrodes, means of taking high-frequency modulated measurement signals from said receiving electrodes, and means (2,500) of processing said measurement signals thus taken in order to supply signals representing the relative displacement or the relative position of said first object with respect to said second object, characterized in that the transmitting and receiving electrodes are arranged to constitute a first capacitance varying as a function of the distance separating the transmitting and receiving plates respectively and a second capacitance varying as a function of the relative misalignment of said plates, and in that the processing means are designed to perform, on the basis of the measurement signals taken, an analogue calculation (i) of a first signal representing the inverse of said first capacitance and (ii) of a second signal representing the ratio of the second capacitance to said first capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- ) for non-contact measurement of a relative displacement or of a relative position of a first object with respect to a second object, comprising;
Specification