Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.

Inductive proximity sensor

Abstract: An inductive proximity sensor includes a bobbin configured to have a first winding unit formed on the side to which an object to be detected approaches and a second winding unit formed with a blocking plate for blocking a magnetic field interposed between the first winding unit and the second winding unit; a pair of first and second sensor coils wound on the first and the second winding units of the bobbin, respectively, and configured to have respective one ends grounded together; and a signal processor coupled with the other ends of the first and the second sensor coils and a line connected to a ground portion where the one ends are grounded together and configured to analyze a change of a received first signal based on a received second signal by processing a change of received signals to determine whether the object to be detected approaches or not based on a result of the determination

Environmental hazard sensor

Abstract: An apparatus for sensing a constituent in an environment including a sensor circuit and a suppression circuit. The sensor circuit has a sensor element and an operating state control element. The sensor element senses the constituent by presenting an electrical parameter which varies as a function of a degree of the constituent. The control element maintains the sensor at a preferred operating state. A detected electrical parameter of said sensor element is subject to error resulting from a leakage of electrical current between the control element and the sensor element. The suppression circuit reduces or stops the leakage to reduce the error.

Monitoring device of an inductive sensor of a mechanical rope lift line

Abstract: A monitoring device (10) of an inductive sensor (11) of a mechanical lift line with a rope (12) comprises support means securedly affixed to a sheave assembly (16) with sheaves (17) associated with a pylon. The device (10) comprises an actuating ramp (24) arranged on a test carriage (13) and able to make the sensor (11) go from a first position detecting presence of the rope (12) to a second position detecting absence of the rope (12). The support means of the sensor (11) comprise a fixed part (18) securedly affixed to the corresponding sheave assembly (16), and a movable part (20, 21, 23) mounted pivoting (19) with respect to the fixed part and operating in conjunction with the actuating ramp (24) of the test carriage (13) to incline the sensor (11) to the second position detecting absence of the rope (12) when the test carriage (13) passes.

Non-Contact Sensing for High-Temperature, Capacitive MEMS Sensors in Active Fuel Emission Control

Abstract: This paper describes a non-contact sensor interface for MEMS capacitive sensors used in active fuel emission control (AFEC). The sensor elements are used as passive capacitors in a LC resonant circuit, the resonant frequency being a function of the sensor capacitance. Detailed analysis of the inductive link reveals a desired operation region in which the normalized resonant frequency response is linear, independent of quality factor, and sensitivity is only weakly dependent on antenna coupling factor. High-temperature sensor interface electronics are proposed to lock to the resonant frequency of the inductive tank circuit and provide a digital readout that is communicated to the combustion node controller. These circuits require a gm-stabilized negative conductance to form an oscillator and a high-speed counter that acts as FM demodulator in a multiplexed architecture that accommodates an array of sensors.

System and method for minimizing magnetic field effect on an isolated magnetometer

Abstract: A system for measuring an electrical current to a heater 18 includes an electrical line 24 between a first power source and the heater 18, a control sensor 32 adjacent to the electrical line, a compensation sensor 34 proximate the control sensor and an operational amplifier 36 electrically connected to the control sensor 32 and the compensation sensor 34. The control sensor 32 is a Hall effect sensor to measure a first magnetic field induced by the electrical current and an ambient magnetic field M and output a resulting first voltage. The compensation sensor 34 is a Hall effect sensor with the same orientation as the control sensor 32 to measure a second magnetic field M induced by the ambient magnetic field and output a resulting second voltage. The operation amplifier 36 is able to receive the first voltage and the second voltage and determine the electrical current flowing through the electrical line 24.