Modeling of Phase Shifts of Light in Orders of Diffraction Gratings of an Interference Linear Displacement Sensor

2019 ◽  
Vol 127 (3) ◽  
pp. 527-534 ◽  
Author(s):  
S. B. Odinokov ◽  
M. V. Shishova ◽  
A. Yu. Zherdev ◽  
M. S. Kovalev ◽  
M. L. Galkin ◽  
...  
Keyword(s):  
Diffraction Gratings ◽  
Phase Shifts ◽  
Linear Displacement ◽  
Displacement Sensor

scholarly journals Phase Imbalance Optimization in Interference Linear Displacement Sensor with Surface Gratings

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1453
Author(s):  
Sergey Odinokov ◽  
Maria Shishova ◽  
Michael Kovalev ◽  
Alexander Zherdev ◽  
Dmitrii Lushnikov
Keyword(s):  
Diffraction Grating ◽  
Phase Shifts ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Accurate Information ◽  
Generation Process ◽  
Optical Branch ◽  
Displacement Sensors ◽  
Reference Scale ◽  
Quadrature Signals

In interferential linear displacement sensors, accurate information about the position of the reading head is calculated out of a pair of quadrature (sine and cosine) signals. In double grating interference schemes, diffraction gratings combine the function of beam splitters and phase retardation devices. Specifically, the reference diffraction grating is located in the reading head and regulates the phase shifts in diffraction orders. Measurement diffraction grating moves along with the object and provides correspondence to the displacement coordinate. To stabilize the phase imbalance in the output quadrature signals of the sensor, we propose to calculate and optimize the parameters of these gratings, based not only on the energetic analysis, but along with phase relationships in diffraction orders. The optimization method is based on rigorous coupled-wave analysis simulation of the phase shifts of light in diffraction orders in the optical system. The phase properties of the reference diffraction grating in the interferential sensor are studied. It is confirmed that the possibility of quadrature modulation depends on parameters of static reference scale. The implemented optimization criteria are formulated in accordance with the signal generation process in the optical branch. Phase imbalance and amplification coefficients are derived from Heydemann elliptic correction and expressed through the diffraction efficiencies and phase retardations of the reference scale. The phase imbalance of the obtained quadrature signals is estimated in ellipticity correction terms depending on the uncertainties of influencing parameters.

scholarly journals Моделирование фазовых сдвигов света в порядках дифракционных решеток интерференционного датчика линейных перемещений

2019 ◽  
Vol 127 (9) ◽  
pp. 469
Author(s):  
С.Б. Одиноков ◽  
М.В. Шишова ◽  
А.Ю. Жердев ◽  
М.С. Ковалев ◽  
М.Л. Галкин ◽  
...  
Keyword(s):  
Surface Relief ◽  
Measurement Accuracy ◽  
Diffraction Gratings ◽  
Phase Shifts ◽  
Displacement Sensor ◽  
Geometrical Parameters ◽  
Optical Signals ◽  
Modeling Data ◽  
Phase Diffraction Grating ◽  
Phase Relationships

Phase shifts of light in the orders of diffraction gratings for the interference sensor of linear displacements are considered. The use of a phase diffraction grating with given geometrical parameters of the surface relief makes it possible to stabilize the phase relationships in the optical signals and, as a result, in the final signals taken from the displacement sensor. Based on mathematical modeling data, technically feasible parameters of the surface relief of diffraction gratings are proposed to create the required phase shifts between the diffracted beams and quadrature modulation signals and to achieve the required measurement accuracy with nanometric resolution.

An enlarge polymer optical fiber linear-displacement sensor based on constructive interference

2021 ◽  
Vol 63 ◽  
pp. 102481
Author(s):  
Abdul Ghaffar ◽  
Mujahid Mehdi ◽  
YanYun Hu ◽  
Arnaldo G. Leal-Junior ◽  
Abdul Basit ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Polymer Optical Fiber ◽  
Constructive Interference

Motion Trajectory Simulation and Measurement of the 5000V Electromagnetic Repulsion Mechanism (ERM)

2012 ◽  
Vol 546-547 ◽  
pp. 368-373
Author(s):  
Jin Wu ◽  
Jin Wu Zhuang ◽  
Yong Hua Zhuang ◽  
Jun Lu
Keyword(s):  
Comparative Analysis ◽  
Simulation Models ◽  
Displacement Transducer ◽  
Linear Displacement ◽  
The Other ◽  
Displacement Sensor ◽  
Motion Trajectory ◽  
Motion Trajectories ◽  
Trajectory Simulation ◽  
Piezoelectric Acceleration

Successful applications of the ERM depend on accurate simulation models. Firstly, we built up a model on the 5000 volts ERM with ansoft. Then we measured motion trajectories of the ERM prototype respectively by means of a piezoelectric acceleration transducer, a magnetic grating displacement transducer and a linear displacement sensor. Based on the comparative analysis of the results from simulation and measurement, we concluded that the simulation model was reliable on one hand, and on the other hand by means of a linear displacement sensor along with a magnetic grating counterpart, we could obtain accurate motion trajectories with a relative error less than 5%.

scholarly journals High precision machining of a displacement sensor for helicoidal motions

2021 ◽  
Author(s):  
Zeina ELRAWASHDEH ◽  
Philippe REVEL ◽  
Christine PRELLE ◽  
Frédéric LAMARQUE
Keyword(s):  
High Precision ◽  
Fiber Optic ◽  
Geometric Model ◽  
Translational Motion ◽  
Surface Characteristics ◽  
Measurement Range ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Fiber Optic Probes

Abstract This research study presents the design and the high precision manufacture procedure of a fiber-optic displacement sensor. It is composed of two fiber-optic probes associated with a structure of a cones’ grating. The sensor is characterized by its ability to measure the linear displacement for an axis performing a helicoidal motion. This motion has been demonstrated on a high precision lathe; where the spindle provided the rotational motion, associated to a translational motion on the linear stage. This allowed to obtain the two simultaneous motions. The displacement of the translational stage is measured by the sensor in real time.Firstly, a highly precise geometric model of the reflector part for the sensor was developed. This model provided a specific geometry for the cones-assembled grating, which has been precisely manufactured. The geometric parameters and the surface characteristics of each step in the fabricated grating were both identified in situ on the lathe. The agreement between simulation and experimental results is excellent. The performances of the fiber-optic displacement sensor were identified in-situ on the lathe. The analysis of the voltage output signals from the two fiber-optic probes is used to measure the grating displacement. The unbalanced rotation due to non-centered axes was also characterized. The sensor provided a micrometric resolution, on a measurement range of more than one centimeter.

An absolute linear displacement sensor

2019 ◽  
Author(s):  
Chuan Mou ◽  
Yang Liu ◽  
Ziqiang Zhong ◽  
Lingli Peng ◽  
Liang Wu
Keyword(s):  
Linear Displacement ◽  
Displacement Sensor

scholarly journals Magneto-optic linear-displacement sensor with high spatial resolution and low noise

2006 ◽  
Vol 99 (8) ◽  
pp. 08B301 ◽  
Author(s):  
S. J. Lee ◽  
Y. Melikhov ◽  
D. C. Jiles ◽  
C. M. Park ◽  
H. Hauser
Keyword(s):  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Linear Displacement ◽  
Low Noise ◽  
Displacement Sensor ◽  
Magneto Optic

Development of a New Type 4D Dynamic Seat Platform Control System Based on PLC

2013 ◽  
Vol 475-476 ◽  
pp. 776-781
Author(s):  
Qing Kui Chen ◽  
Yu Long Chen
Keyword(s):  
Control System ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Hydraulic Pump ◽  
Cost Performance ◽  
Loop Feedback ◽  
New Type ◽  
Working Principle ◽  
Closed Loop Feedback ◽  
Seat Control

This article has introduced the development method of a kind of 4d cinema dynamic seat control system based on PLC, expounds the system's hardware structure , working principle, function characteristics, etc. The system's power is provided by hydraulic pump, hardware adopts closed loop feedback control system constituted by omron PLC, A/D module, D/A module, linear displacement sensor and electromagnetic proportional directional valve. The system has good stability, high cost performance, miniaturization, intelligent, etc.

Research on the Transverse Displacement Sensors Using Linear Array CCD

2011 ◽  
Vol 317-319 ◽  
pp. 988-991
Author(s):  
Fu Bao Li ◽  
Qin Li ◽  
Zhong Ke Li
Keyword(s):  
Nonlinear Problem ◽  
Relative Motion ◽  
Linear Array ◽  
Linear Displacement ◽  
External Factors ◽  
Displacement Sensor ◽  
Transverse Displacement ◽  
Displacement Sensors ◽  
Ccd Array ◽  
The Relationship

Linear displacement sensor is a component, which can convert the displacement into electrical signals, and is used to measure the relative motion between components. Because the relationship between output of sensor and stroke power is nonlinear and it may be affected by external factors, the circuit should be compensated and the sensor should be calibrated. In this research, the LED formed light knife in the mechanical slit, lighting on the sensitive CCD array, and the relationship between displacement and CCD photosensitive arrays can be founded. CCD is the discrete components, which has avoided the nonlinear problem. At the same time, because the CCD output is digital, it reduced the measurement time, so that linearity, accuracy, stability, greatly are improved greatly.

A sample cell forin situelectric-field-dependent structural characterization and macroscopic strain measurements

2016 ◽  
Vol 23 (3) ◽  
pp. 694-699 ◽  
Author(s):  
Mohammad J. Hossain ◽  
Lijun Wang ◽  
Zhiyang Wang ◽  
Neamul H. Khansur ◽  
Manuel Hinterstein ◽  
...  
Keyword(s):  
Structural Changes ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Macroscopic Strain ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Sample Cell ◽  
Structural Variations ◽  
X Ray ◽  
Electric Potentials

When studying electro-mechanical materials, observing the structural changes during the actuation process is necessary for gaining a complete picture of the structure–property relationship as certain mechanisms may be meta-stable during actuation.In situdiffraction methods offer a powerful and direct means of quantifying the structural contributions to the macroscopic strain of these materials. Here, a sample cell is demonstrated capable of measuring the structural variations of electro-mechanical materials under applied electric potentials up to 10 kV. The cell is designed for use with X-ray scattering techniques in reflection geometry, while simultaneously collecting macroscopic strain data using a linear displacement sensor. The results show that the macroscopic strain measured using the cell can be directly correlated with the microscopic response of the material obtained from diffraction data. The capabilities of the cell have been successfully demonstrated at the Powder Diffraction beamline of the Australian Synchrotron and the potential implementation of this cell with laboratory X-ray diffraction instrumentation is also discussed.

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