Topic
Inductive sensor
About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.
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TL;DR: A novel circuit for inductive sensing that was constructed using a quartz crystal resonator and an inductance element in series was proposed and resonant frequency expression of equivalent model of the circuit was derived.
Abstract: A novel circuit for inductive sensing that was constructed using a quartz crystal resonator and an inductance element in series was proposed. Resonant frequency expression of equivalent model of the circuit was derived. The experimental results of the resonant frequency responses versus inductance changes of the circuit were coincident with the theoretical derivation, which proved that resonant frequency of the circuit could be tuned by inductance element. A quartz crystal inductive displacement sensor utilizing a planar spiral inductor was developed based on the earlier theories. The measurement results of the displacement sensor exhibited a highly sensitive response of 1 Hz/ $\mu \text{m}$ in the wide distance range 0–2000 $\mu \text{m}$ and a good stability with 0.043-Hz standard deviation of the output frequency. Furthermore, the fundamental frequency dependence of quartz crystal inductive displacement sensor was also discussed. The experimental results showed that the maximum sensing range of the sensor with 10-MHz fundamental frequency was 18 mm. The best advantage of the proposed method in this paper was the convenient implementation of a high-sensitivity inductive sensor with stable digital frequency output.
11 citations
13 May 2012
TL;DR: In this article, a multiple inductive loop detector system that uses the mutual inductances between an outer loop and multiple inner loops is presented, where small inner loops are placed within a large outer loop.
Abstract: A new multiple inductive loop detector system that uses the mutual inductances between an outer loop and multiple inner loops is presented in this paper. Automated detection, classification and speed measurement of vehicles are a challenging task in a no-lane and heterogeneous traffic. A recently reported multiple loop scheme is a solution but it is complex and less reliable due to large number of electrical connections required to realize the system. This paper proposes a loop sensor wherein small inner loops are placed within a large outer loop. In the new system the outer loop alone is connected to the measurement unit and all the inner loops are simply coupled inductively to the outer loop. This scheme is simple and can be easily employed to convert an existing single loop system to a multiple loop system by incorporating the inner loops. A suitable measurement scheme based on a synchronous detection is employed that guarantees accurate measurement. A special excitation that ensures parallel resonance of the whole inductive system is employed to keep the power consumption minimum. A prototype of the proposed system has been built and the practicality has been tested. The new system correctly sensed the vehicles, categorized and counted them in an undisciplined traffic.
11 citations
Patent•
03 Apr 2002
TL;DR: In this article, the authors proposed an X-ray sensor signal processing circuit capable of detecting pulse-like X-rays emitted from an accelerator and passed through the subject, and comprising a bias voltage control circuit having a function for making a bias voltages of the sensor zero at least once between the emission of the Xrays from the accelerator and the emissions of next Xrays.
Abstract: PROBLEM TO BE SOLVED: To provide an X-ray sensor signal processing circuit capable of measuring X-ray doses with uniform sensitivity at all times, by reliably suppressing sensitivity reductions due to polarizing effects which occur in an X-ray sensor even in the case of using a CdTe sensor as the X-ray sensor, and to provide an X-ray CT apparatus using the same. SOLUTION: The X-ray sensor signal processing circuit processes an output signal of the X-ray sensor for detecting pulse-like X-rays emitted from an accelerator and passed through the subject, and comprises a bias voltage control circuit having a function for making a bias voltage of the X-ray sensor zero at least once between the emission of the X-rays from the accelerator and the emission of next X-rays. COPYRIGHT: (C)2004,JPO
11 citations
TL;DR: In this paper, a step-motor control with an accuracy better than 2 ° has been demonstrated with a miniaturized inductive proximity sensor, made of a 1 mm diameter coil connected to a new and highly sensitive ASIC based on a differential relaxation oscillator.
Abstract: A resolution better than 50 nm has been achieved with a new miniaturized inductive proximity sensor. This sensor microsystem is made of a 1 mm diameter coil connected to a new and highly sensitive ASIC based on a differential relaxation oscillator. Lateral as well as axial resolutions have been characterized. A microsystem for step-motor control with an accuracy better than 2 ° is demonstrated. This application is not affected by the temperature behaviour of the sensor.
11 citations
Patent•
07 Nov 1978
TL;DR: In this article, a compact sensor arrangement for determining the axial or radial position of a rotor is presented, with a magnetic bearing having reference surfaces for the sensors providing highly accurate position signals at low cost.
Abstract: A compact sensor arrangement for determining the axial or radial position of a rotor, esp. with a magnetic bearing having reference surfaces for the sensors provides highly accurate position signals at low cost. The position signals provide feedback to control regulating the bearing coil currents. Inductive sensors (1 to 8) are provided for the generation of signals corresp. both to the distance between sensor and reference surface and to the lateral alignment of the sensor and surface. All the sensors (1-8) are contained in a single unit and/or all sensors work in conjunction with a single cylindrical reference surface (38). A set of four sensors (1 to 4) equally spaced about the rotor axis (9) measuring radial positions is radially and axially offset from a set of four sensors (5 to 8) measuring axiall rotor positions.
11 citations