Abstract: A method for non-contact measurement of a displacement between a surface and a capacitive sensor comprised of at least two superimposed conductive plates electrically insulated one from the other and a sensor circuit coupled to the plates including: positioning the capacitive sensor proximate to the surface such that the displacement is a distance of a gap between the surface and one of the plates; applying a high frequency signal to the plates; applying the high frequency signal and a sensor plate to control a voltage gain of an amplifier in the circuit, where the capacitance on the sensor is indicative of the displacement between the sensor and surface; differentiating an output of the amplifier and the high frequency signal, and determining a value of the displacement based on the difference between the output of the amplifier and the high frequency signal.

Abstract: A non-contact capacitive sensor including: a sensor plate configured to be displaced from a surface and to measure a capacitance of a gap between the surface and sensor plate; an active shield plate over the sensor plate and insulated from said sensor plate, wherein a high frequency input signal is applied to the active shield plate and sensor plate; an effective ground shield plate connected through a first resistor to a ground, over the active shield plate to sandwich the active shield plate between the ground shield plate and the sensor plate, and the ground shield plate is insulated from the active shield plate, and a second resistor connected between the ground shield plate and the active shield plate to provide a direct current (dc) path through the sensor.

Abstract: A non-contact capacitive sensor probe including a metallic sensor having a first surface opposite a dielectric medium to be sensed; a plurality of active metallic shields adjacent to the metallic sensor, each of the active metallic shields having a pattern of grooves inhibiting eddy currents on a surface of the shield, wherein the pattern on one shield does not overlap with the pattern on a second shield, and a passive metallic shield adjacent the active metallic shields, such that active metallic shields are sandwiched between the metallic sensor and the passive metallic shield.

Abstract: A multiple gang junction box assembly includes a main box and wire clamping devices.disposed in an interior chamber of and attached to the main box. Each wire clamping device includes a clamp housing structure attached to the main box so as to define a passage therethrough into its interior chamber and a clamp member disposed in the housing structure across the passage and flexably bendable at an upper end attached to the main box so as to enable the clamp member to undergo pivotal movement from a closed position toward an open position relative to the passage such that a lower end of the clamp member and a plurality of barbs on the housing structure can assume a locking condition relative to a wire pushed into the main box through passage that prevents the wire from being pulled back through the passage and from the main box.

Abstract: A multiple gang junction box assembly includes a main box, divider panels, first and second pluralities of positioning elements for receiving and positioning the divider panels in an interior chamber of the main box so as to laterally space apart the divider panels in lockable positions therein and to partition the interior chamber into a plurality of side-by-side compartments, and a front cover plate for covering a front opening of the main box. The first plurality of positioning elements are disposed in the interior chamber on either a rear wall or top and bottom walls of the main box. The second plurality of positioning elements are disposed on upper and lower edges of the divider panels and on top and bottom walls of the main box and spaced forwardly from the first plurality of positioning elements.

Abstract: A multiple gang junction box assembly includes a main box, divider panels, positioning elements attached to the main box in an interior chamber thereof for slidably receiving the divider panels therein and laterally spacing apart the divider panels from one another so as to partition the interior chamber into adjacent compartments being in a condition of electrical arcing isolation from one another which allows low and high voltage components to be housed therein, and a front cover plate having vertical lands protruding therefrom and laterally spaced apart from one another. The displacement of the divider panels from one another is equal to a selected number of times the distance of the vertical lands from one another. At least some vertical lands of the front cover plate and the front edge portions of the divider panels are placed in flush contact providing additional isolation of adjacent compartments from one another.