Journal ArticleDOI
A Dual Slope LVDT-to-Digital Converter
TLDR
In this paper, a simple LVDT-to-digital converter that does not require a precise sine-wave excitation or a phase-matching circuit is presented.Abstract:
This paper presents a simple, new LVDT-to-digital converter that does not require a precise sine-wave excitation or a phase-matching circuit, like the traditional methods. The scheme relies on a triangular current excitation to the primary coil, derived from a couple of dc reference voltages. A dual-slope conversion of the secondary voltages in a ratiometric manner yields a digital output that is automatically de-sensitized to extraneous variations and directly proportional to the measurand (displacement). A detailed analysis of the effect of circuit parameters on the performance of the scheme is also presented. A prototype of the proposed circuit built and tested in the laboratory gave an effective number of bits of up to 12.7 bits and a speed of 10 conversions/s. The non-linearity error noted from the tests conducted was less than 0.15%.read more
Citations
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Journal ArticleDOI
Toward Non-CPU Activity in Low-Power MCU-Based Measurement Systems
TL;DR: For the sensor data logging application under study, both energy consumption and measuring time are reduced by a factor of 2 with respect to the case of applying an interrupt-based approach that requires the CPU intervention.
Journal ArticleDOI
A Highly Robust Interface Circuit for Resistive Sensors
TL;DR: In this article, the authors present the structure of an interface circuit for resistive sensors that is highly robust to component and power supply variations using the ratiometric approach, thus complex circuits or highly accurate voltage references are not necessary.
Journal ArticleDOI
Three-Axis Inductive Displacement Sensor Using Phase-Sensitive Digital Signal Processing for Industrial Magnetic Bearing Applications
Teemu Sillanpää,Alexander Smirnov,Pekko Jaatinen,Jouni Vuojolainen,Niko Nevaranta,Rafal P. Jastrzebski,Olli Pyrhonen +6 more
TL;DR: The paper presents a sensor design utilizing only a single unified sensor stator and a single shared rotor mounted target piece surface to achieve the measurement of all three measurement axes, which meets the application requirements and has a robust construction utilizing conventional electrical steel lamination stacks and copper winding.
Journal ArticleDOI
Low-Cost Linearity Range Enhancement for Linear Variable Differential Transformer
TL;DR: In this article , a low-cost and low-complexity technique was proposed to enhance the linearity range of linear variable differential transformer (LVDT) using logarithmic approximation and summing/subtracting operation.
Low-Cost Linearity Range Enhancement for Linear Variable Differential Transformer
TL;DR: In this paper , a low-cost and low-complexity technique was proposed to enhance the linearity range of linear variable differential transformer (LVDT) using logarithmic approximation and summing/subtracting operation.
References
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Journal ArticleDOI
Performance analysis of a digital capacitance measuring circuit
TL;DR: The design and study of a digital capacitance measuring circuit with theoretical analysis, numerical simulation, and experimental evaluation shows that the SNR and standard deviation can be further improved if the data sampled in more than one period are used for demodulation by the circuit.
Journal ArticleDOI
A novel DSP-based LVDT signal conditioner
TL;DR: A novel signal conditioning system for linear variable differential transformers (LVDTs) that considers the signals involved in the operation of the LVDT to be analogous to a double sideband suppressed carrier AM (DSBSC-AM) communication system.
Proceedings ArticleDOI
System on Chip Signal Conditioner for LVDT Sensors
TL;DR: In this paper, the authors developed a one-chip solution made entirely in SMD technology and its small dimensions allow its integration into sensor's body, which integrates all peripherals required for LVDT signal conditioning (pulse width modulation modules, analog to digital converter, timers, enough memory resources and processing power).
Journal ArticleDOI
Direct inductive sensor-to-microcontroller interface circuit
TL;DR: In this article, a microcontroller-based interface circuit for inductive sensors with a variable self-inductance was proposed and analyzed, where the circuit just requires an external resistor and a reference inductor so that two RL circuits are formed.