Investigation of a photonic displacement sensor

A piezoelectric actuator using a lever mechanism is designed, fabricated, and tested with the aim of accomplishing long-travel precision linear driving based on the stick-slip principle. The proposed actuator mainly consists of a stator, an adjustment mechanism, a preload mechanism, a base, and a linear guide. The stator design, comprising a piezoelectric stack and a lever mechanism with a long hinge used to increase the displacement of the driving foot, is described. A simplified model of the stator is created. Its design parameters are determined by an analytical model and confirmed using the finite element method. In a series of experiments, a laser displacement sensor is employed to measure the displacement responses of the actuator under the application of different driving signals. The experiment results demonstrate that the velocity of the actuator rises from 0.05 mm/s to 1.8 mm/s with the frequency increasing from 30 Hz to 150 Hz and the voltage increasing from 30 V to 150 V. It is shown that the minimum step distance of the actuator is 0.875 μm. The proposed actuator features large stroke, a simple structure, fast response, and high resolution.

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The key Research on Improving the Anti-jamming Performance of POF Displacement Sensor

Journal of Physics Conference Series ◽

10.1088/1742-6596/1865/2/022035 ◽

2021 ◽

Vol 1865 (2) ◽

pp. 022035

Author(s):

Sen Zhang ◽

Huili Xue

Keyword(s):

Displacement Sensor

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Turning Dynamics: Part 1 — Experimental Analysis

Volume 4: Dynamics, Control and Uncertainty, Parts A and B ◽

10.1115/imece2012-87933 ◽

2012 ◽

Author(s):

Eric B. Halfmann ◽

C. Steve Suh ◽

N. P. Hung

Keyword(s):

Instantaneous Frequency ◽

Period Doubling ◽

Displacement Sensor ◽

Laser Displacement Sensor ◽

Turning Process ◽

Time Frequency ◽

Spectral Components ◽

Tool Vibrations ◽

Exact Moment ◽

The Stability

The workpiece and tool vibrations in a lathe are experimentally studied to establish improved understanding of cutting dynamics that would support efforts in exceeding the current limits of the turning process. A Keyence laser displacement sensor is employed to monitor the workpiece and tool vibrations during chatter-free and chatter cutting. A procedure is developed that utilizes instantaneous frequency (IF) to identify the modes related to measurement noise and those innate of the cutting process. Instantaneous frequency is shown to thoroughly characterize the underlying turning dynamics and identify the exact moment in time when chatter fully developed. That IF provides the needed resolution for identifying the onset of chatter suggests that the stability of the process should be monitored in the time-frequency domain to effectively detect and characterize machining instability. It is determined that for the cutting tests performed chatters of the workpiece and tool are associated with the changing of the spectral components and more specifically period-doubling bifurcation. The analysis presented provides a view of the underlying dynamics of the lathe process which has not been experimentally observed before.

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Nanometer-scale displacement sensor based on phase-sensitive diffraction grating

Applied Optics ◽

10.1364/ao.50.001413 ◽

2011 ◽

Vol 50 (10) ◽

pp. 1413 ◽

Cited By ~ 22

Author(s):

Shuangshuang Zhao ◽

Changlun Hou ◽

Jian Bai ◽

Guoguang Yang ◽

Feng Tian

Keyword(s):

Diffraction Grating ◽

Displacement Sensor ◽

Nanometer Scale ◽

Phase Sensitive

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Angular displacement sensor based on oscillistor effect

Journal of Physics Conference Series ◽

10.1088/1742-6596/1901/1/012104 ◽

2021 ◽

Vol 1901 (1) ◽

pp. 012104

Author(s):

A I Cheredov ◽

A V Shchelkanov

Keyword(s):

Angular Displacement ◽

Displacement Sensor

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Acoustic Emission and K-S Metric Entropy as Methods for Determining Mechanical Properties of Composite Materials

Sensors ◽

10.3390/s21010145 ◽

2020 ◽

Vol 21 (1) ◽

pp. 145

Author(s):

Lesław Kyzioł ◽

Katarzyna Panasiuk ◽

Grzegorz Hajdukiewicz ◽

Krzysztof Dudzik

Keyword(s):

Mechanical Properties ◽

Acoustic Emission ◽

Composite Material ◽

Composite Materials ◽

Testing Machine ◽

Measurement Data ◽

Entropy Method ◽

Displacement Sensor ◽

Metric Entropy ◽

Plastic Phase

Due to the unique properties of polymer composites, these materials are used in many industries, including shipbuilding (hulls of boats, yachts, motorboats, cutters, ship and cooling doors, pontoons and floats, torpedo tubes and missiles, protective shields, antenna masts, radar shields, and antennas, etc.). Modern measurement methods and tools allow to determine the properties of the composite material, already during its design. The article presents the use of the method of acoustic emission and Kolmogorov-Sinai (K-S) metric entropy to determine the mechanical properties of composites. The tested materials were polyester-glass laminate without additives and with a 10% content of polyester-glass waste. The changes taking place in the composite material during loading were visualized using a piezoelectric sensor used in the acoustic emission method. Thanks to the analysis of the RMS parameter (root mean square of the acoustic emission signal), it is possible to determine the range of stresses at which significant changes occur in the material in terms of its use as a construction material. In the K-S entropy method, an important measuring tool is the extensometer, namely the displacement sensor built into it. The results obtained during the static tensile test with the use of an extensometer allow them to be used to calculate the K-S metric entropy. Many materials, including composite materials, do not have a yield point. In principle, there are no methods for determining the transition of a material from elastic to plastic phase. The authors showed that, with the use of a modern testing machine and very high-quality instrumentation to record measurement data using the Kolmogorov-Sinai (K-S) metric entropy method and the acoustic emission (AE) method, it is possible to determine the material transition from elastic to plastic phase. Determining the yield strength of composite materials is extremely important information when designing a structure.

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