摘要:
According to some embodiments, a Microelectromechanical System (MEMS) sensor includes a sensing portion that generates a mechanical movement in response to a measurand input. The sensor also includes a logic portion to mechanically perform a logic function in response to the movement.
摘要:
A method and apparatus for collecting power distribution system data is provided. The method includes communicatively coupling a plurality of node electronic units to a digital network, communicatively coupling at least one central control processing unit (CCPU) to the digital network, executing a data capture software module running on the at least one CCPU wherein the module includes a data capture buffer and a secondary buffer, and activating the data capture module in response to a triggering event. The apparatus includes a plurality of node electronic units, at least one central control processing unit (CCPU), and a data capture software module running on the at least one CCPU wherein the module includes a data capture buffer and a secondary buffer wherein the module is configured to collect data in the data capture buffer and the secondary buffer, and the module is configured to activate in response to a triggering event.
摘要:
Current is sensed in a physically large conductor by a pair of noncontacting, magnetically responsive corrected current sensors. The sensors each have a preferred magnetic sensing axis. A holding arrangement, which may be a printed-circuit board, holds the two current sensors with their axes spaced apart and parallel, to thereby define a sensing plane. The holding arrangement is placed near the conductor in which current is to be sensed, with the sensing plane parallel to a tangent to outer surface of the conductor. The current in the conductor is represented by the sum of the signals of the sensors. In the case of alternating current and sensors responsive to the absolute value of magnetic field, the summing includes subtraction.
摘要:
A self powered parallel bar current sensor for generating a signal which accurately represents current in a power line includes a power coil core having an opening extending therethrough, and a current sensing element including two substantially parallel sensing bars and a sensing coil. The sensing coil is disposed between the sensing bars, and the sensing bars and sensing coil extend through the power coil core opening. A reference coil may also be situated between the sensing bars. The current sensor is connected in series in the power line.
摘要:
A dynamic temperature compensation method for a turbidity sensor in an appliance for washing articles is provided. The method includes the steps of: retaining substantially particle-free liquid upon completion of cleansing operations in the appliance, reading initial values of temperature and turbidity of the liquid, measuring additional values of temperature and turbidity of the liquid at predetermined time intervals, and calculating a temperature coefficient, based upon respective ones of the initial and the additional values of temperature and turbidity, for characterizing a temperature response of the turbidity sensor over a predetermined temperature range.
摘要:
An alternating current sensor includes a conductive pipe and a cylindrical-shaped conductive element preferably partially surrounded by the pipe. The pipe is substantially concentric to the conductive element and a conductor electrically connects a pair of corresponding ends of the pipe and conductive element to form a connected conductive path through the sensor. The pipe and the conductive element are spaced apart a predetermined radial distance to form a magnetic field in the space between the pipe and the conductive element during current flow along the connected conductive path. A flux sensor, such as an air-core coil, senses changes in magnetic flux over a sense region situated in the space between the pipe and the conductive element. A transformer having a saturable magnetic core is responsive to a magnetic field over a transformer region for generating a predetermined level of electrical current which can be used for safely powering various electrical circuits associated with the current sensor.
摘要:
An alternating current sensor employing a mutually-inductive current sensing scheme comprises a conductive pipe and a cylindrical-shaped conductive element at least partially surrounded by the pipe. The pipe is substantially concentric to the conductive element and a conductor electrically connects a pair of corresponding ends of the pipe and conductive element to form a connected conductive path through the sensor. The conductive element may include a passage or opening shaped to form a magnetic field within the passage during current flow along the conductive path.
摘要:
A noninductive shunt current sensor includes a cylindrical-shaped conductive element and a concentric conductive pipe electrically connected at one end by a conductor, such as a washer. Except for the conductor, the pipe and conductive element are electrically isolated from each other by insulation, such as a polyimide or an air-gap. Sensing wires are electrically connected to contact points, each contact point being located on either the inner surface of the inner pipe or the outer surface of the outer pipe. The wires pass through a space where the magnetic field is substantially null, thereby minimizing any mutual coupling effects. A magnetic core and a coil can be situated between the pipe and the conductive element to provide an electrical self-power capability to the noninductive shunt current sensor.
摘要:
A noninductive shunt current sensor includes a cylindrical-shaped conductive element and a concentric conductive pipe electrically connected at one end by a conductor, such as a washer. Except for the conductor, the pipe and conductive element are electrically isolated from each other by insulation, such as Kapton.TM. or an air-gap. Sensing wires are electrically connected to contact points, each contact point being located on either the inner surface of the inner pipe or the outer surface of the outer pipe. The wires pass through a space where the magnetic field is substantially null, thereby reducing any mutual coupling effects.
摘要:
An optical temperature compensation system for spectral modulation sensors includes a light director for receiving excitation light, a spectral modulation sensor for receiving and modulating a first portion of the excitation light from the light director, and an optical processing component for receiving and determining properties of a second portion of the excitation light from the light director and the modulated first portion of the excitation light. The optical processing component comprises a dispersive element for dispersing the second portion of the excitation light and the modulated first portion of the excitation light and a charge transfer device for converting the dispersed portions of light into electrical signals. A digital signal processor calculates a detected ratio of the electrical signals which compensates for inaccuracies in measurement due to source temperature variations.