Abstract
In order to achieve long-distance measurement, a bridge differential inductance detection circuit is employed; on this basis, an automatic zero adjustment technique for sensors using an integral–proportional-integral controller is proposed in this work to achieve consistent product production and efficient installation and debugging, and the mathematical model of the bridge differential inductance detection circuit is established to effectively design the controller parameters. Furthermore, an implementation method for an inductive proximity sensor with an attenuation coefficient of 1 is also proposed based on the bridge differential inductance detection circuit by querying the proximity distance table in the field-programmable gate array (FPGA) to detect multiple target metal objects at the same inductive distance. Simulation and experimental results show that the proposed method is correct and effective.
Highlights
Since the beginning of the 21st century, there has been a growing demand for proximity sensors in various fields
With the development of aerospace and industry, high requirements are placed on the long-distance measurement of inductive proximity sensors [5]
A bridge differential inductance detection circuit and the field-programmable gate array (FPGA) are used as the electronic measurement circuit of sensors, and automatic zero adjustment technology is proposed to meet the consistency needs of product production and improve the efficiency of use of the design
Summary
Since the beginning of the 21st century, there has been a growing demand for proximity sensors in various fields. In [7], a detection method is studied which can eliminate the limitation of the mechanical conversion device and/or auxiliary magnet target but can allow the inductive proximity sensor to achieve high performance. This method is realized according to the function relationship between the detection distance and transducer impedance (Z). The detection circuit detects the inductance variation of the coil in the induction surface to realize the measurement of the approach distance of the target metal objects This method can eliminate most external interference signals and, as far as possible, ensure the effectiveness of the necessary information we need to enhance the anti-interference ability [9,10]. An automatic zero calibration method based on an integral–proportional-integral (I-PI) controller is proposed, and the attenuation coefficient of 1 is achieved by searching in the table
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