Inductive sensor

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

Design of Highly Selective Metamaterials for Sensing Platforms

Abstract: This paper presents a methodology to construct novel label-free sensing platforms using carefully engineered materials (metamaterials) that have dimensions considerably smaller than the operating wavelength, λ. This paper demonstrates that highly selective sensing platforms can be achieved by using metamaterials consisting of periodic arrays of capacitive and inductive elements. Specifically, this paper gives the design of the following four basic sensing parameters of sensing platforms: 1) resonant frequency ω0; 2) resonant frequency shift Δω0; 3) bandwidth B; and 4) transmission ratio T. Using this approach, the bandwidth B and resonant frequency ω0 can easily be modulated by using different combination sets of metallic patch elements and metallic wire elements. Equivalent circuit analysis and numerical methods have been applied to determine the basic sensing design rules for constructing periodic arrays of capacitive and inductive elements, and the efficiency of the obtained label-free sensing architectures has been evaluated. The overall contribution of this paper is to develop a methodology for designing highly selective biosensors by optimizing the dimensions of underlying circuit at the subwavelength scale.

Arrangement comprising an inductive proximity sensor, and method implementing such a sensor

Abstract: An electronic circuit detecting proximity includes an excitation coil emitting an inductive excitation field toward a target. A first pair of detection coils obtains a first differential inductive signal that is modified by a transition of the target within the inductive field. An out-of phase second pair of detection coils obtains a second differential inductive signal that is modified by a transition of the target within the inductive field. A comparator generates a transition signal when the difference between the first and second differential signals reaches a threshold value. A stationary target, in a ferromagnetic or conductive material, creates an offset to the signals at the outlet of the coil pairs. The offset is decreased during the presence of a movable target within the same type of material or increased during the presence of a movable target within another type of material. A comparator detects the offset level.

Inductive measuring transducer

Abstract: The invention relates to an inductive measuring transducer, comprising elements that can be displaced relative to one another. One of said elements (generator element (2)) comprises at least one inductive generator (6) that generates a magnetic alternating field, and the other element (sensor element (1)) comprises one or more inductive sensors. An electronic circuit (3) supplies the inductive generator (6) with an alternating current. The sensor element (1) has a closed conductive loop (10) in which the inductive generator(s) of the generator element (2) induce(s) a voltage in such a manner that a voltage profile is created that depends on the position of the generator element (2) with respect to the sensor element (1). Resistors (11) are connected along the conductive loop (10).

Inductive Sensor for Lightning Current Measurement, Fitted in Aircraft Windows—Part II: Measurements on an A320 Aircraft

Abstract: A novel sensor for the detection of the lightning current through the fuselage of an aircraft has been tested on an A320 aircraft. An accurate method-of-moment model of the window edge provided reliable calibration of the sensor for external fields. The data have been analyzed and the good performance of the sensor in sensitivity and bandwidth is demonstrated.

Archimedean Spiral Pairs with no Electrical Connections as a Passive Wireless Implantable Sensor.

Abstract: We have developed, modeled, fabricated, and tested a passive wireless sensor system that exhibits a linear frequency-displacement relationship. The displacement sensor is comprised of two anti-aligned Archimedean coils separated by an insulating dielectric layer. There are no electrical connections between the two coils and there are no onboard electronics. The two coils are inductively and capacitively coupled due to their close proximity. The sensor system is interrogated wirelessly by monitoring the return loss parameter from a vector network analyzer. The resonant frequency of the sensor is dependent on the displacement between the two coils. Due to changes in the inductive and capacitive coupling between the coils at different distances, the resonant frequency is modulated by coil separation. In a specified range, the frequency shift can be linearized with respect to coil separation. Batch fabrication techniques were used to fabricate copper coils for experimental testing with air as the dielectric. Through testing, we validated the performance of sensors as predicted within acceptable errors. Because of its simplicity, this displacement sensor has potential applications for in vivo sensing.