Modeling of two-plate capacitive position sensing systems for high precision planar three DOF measurement

2016 ◽  
Vol 46 ◽  
pp. 383-392 ◽  
Author(s):  
Leon Clark ◽  
Bijan Shirinzadeh
Keyword(s):  
High Precision ◽  
Position Sensing ◽  
Sensing Systems

High-precision fiber-optic position sensing using diode laser radar techniques

1990 ◽  
Author(s):  
Gregory L. Abbas ◽  
W. Randall Babbitt ◽  
Michael de la Chapelle ◽  
Mark L. Fleshner ◽  
James D. McClure ◽  
...  
Keyword(s):  
Diode Laser ◽  
High Precision ◽  
Fiber Optic ◽  
Laser Radar ◽  
Position Sensing

scholarly journals Current Progress of Magnetoresistance Sensors

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 211
Author(s):  
Songlin Yang ◽  
Jin Zhang
Keyword(s):  
Magnetic Fields ◽  
Giant Magnetoresistance ◽  
Hard Disk Drives ◽  
Magnetic Storage ◽  
Resistance Change ◽  
Current Sensing ◽  
Position Sensing ◽  
Biomedical Sensing ◽  
Sensing Systems ◽  
Current Trends

Magnetoresistance (MR) is the variation of a material’s resistivity under the presence of external magnetic fields. Reading heads in hard disk drives (HDDs) are the most common applications of MR sensors. Since the discovery of giant magnetoresistance (GMR) in the 1980s and the application of GMR reading heads in the 1990s, the MR sensors lead to the rapid developments of the HDDs’ storage capacity. Nowadays, MR sensors are employed in magnetic storage, position sensing, current sensing, non-destructive monitoring, and biomedical sensing systems. MR sensors are used to transfer the variation of the target magnetic fields to other signals such as resistance change. This review illustrates the progress of developing nanoconstructed MR materials/structures. Meanwhile, it offers an overview of current trends regarding the applications of MR sensors. In addition, the challenges in designing/developing MR sensors with enhanced performance and cost-efficiency are discussed in this review.

Stitching of 3-D Image Position Measurement System with 1-D Direction-sensitive Devices

2001 ◽  
Vol 13 (6) ◽  
pp. 651-658
Author(s):  
Saied Mohamed ◽  
◽  
Toyomi Fujita ◽  
Masanori Idesawa
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Bright Spot ◽  
Position Measurement ◽  
Position Sensing ◽  
Sensing System ◽  
Mathematical Techniques ◽  
Image Position

We previously proposed practical calibration of 3-D bright spot position measurement system using 3 1-D direction-sensitive devices. The proposed calibration enables easy setup of 1-D direction-sensitive devices to construct 3-D position sensing system; then the applicable fields and circumstances are extended extremely. The method is based on mathematical techniques which the situation of each 1-D mark direction sensitive device is determined automatically by referencing coordinates with 7 referential points. Here, we are proposing the stitching of measurement space of high-precision 3-D position sensing with 1-D mark direction-sensitive devices to expand measured space further. Our proposed method is essentially iterative application of calibration: reference coordinates are translated and rotated to include both adjacent measurement spaces step by step, calibration is executed, and the position and situation of each 1-D direction-sensitive device are found systematically.

A Novel Simple and Low Cost 4-DOF Angular Indexing Calibrating Technique for High Precision Rotary Table

2006 ◽  
Author(s):  
Chun-Jen Chen ◽  
Wenyuh Jywe ◽  
Yun-Feng Teng ◽  
Chien-Huang Liu
Keyword(s):  
High Precision ◽  
Degrees Of Freedom ◽  
Low Cost ◽  
Rotary Table ◽  
Reference Table ◽  
Position Sensing ◽  
Full Circle ◽  
Good Repeatability ◽  
4 Degrees Of Freedom ◽  
Standard Table

For calibrating an angular rotary table, either a high precision standard table or a laser interferometer and related optics are normally employed at high cost. This paper establishes a novel, simple and low cost technique to calibrate a 4-degrees-of-freedom errors of a rotary table (three angular motion errors and one displacement error) for a 360° full circle by employing one reference rotary table, one 1D grating and two 2D (2 dimensional) position-sensing-detectors. With this technique, no highly accurate reference table with good repeatability is needed. After two full circle tests, the 4 DOF errors of the target rotary table and the reference table can be calculated respectively. The angular uncertainty of the measurement system can be less than 1.5 arc sec, while the displacement uncertainty can be up to 1.5 μm.

Direct laser writing of vertical junctions in graphene oxide films for broad spectral position-sensitive detectors

Nanophotonics ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 1563-1570 ◽  
Author(s):  
Rui Feng ◽  
Laigui Hu ◽  
Youwei Zhang ◽  
Muhammad Zaheer ◽  
Zhi-Jun Qiu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
High Precision ◽  
Photovoltaic Effect ◽  
Main Role ◽  
Spectral Position ◽  
Zero Bias ◽  
Position Sensing ◽  
Direct Laser ◽  
Position Sensitive ◽  
Position Sensitive Detectors

AbstractHeterostructures with built-in electric fields are crucial for charge separation and lateral photovoltaic effect in current position-sensitive detectors (PSDs), which have to be produced by combining semiconductors with metal or other semiconductors to form various vertical junctions (e.g. Schottky junctions) via complicated and high-cost manufacture processes. In the present work, it was found that vertical junctions can be directly written and patterned inside graphene oxide (GO) films with gradient C/O ratios by laser scribing due to the optical filter effect of the films and the formation of reduced GO (rGO) layers. Such junctions were verified to show the capability for high-precision position sensing on the micrometer scale, owing to the lateral photovoltaic effect. These self-powered laser-scribed PSDs can exhibit a small nonlinearity of <5.4%, which is far less than the acceptable level of 15%. A fast response time of about 1 ms can be obtained under a zero bias voltage, which is the fastest speed among the photodetectors based on pure rGO. Electron lateral diffusion in the upper layers of the laser-scribed devices was found to play a main role. These suggest that laser-scribed vertical junctions inside rGO are promising for high-precision displacement sensing, with the capability of low cost, flexibility, and passive operation mode.

3D Position Sensing Using the Differences in the Time-of-Flights From a Wave Source to Various Receivers — A Conceptual Model

1999 ◽  
Author(s):  
Ajay Mahajan ◽  
Maurice Walworth
Keyword(s):  
Virtual Reality ◽  
Time Delay ◽  
Conceptual Model ◽  
Vibration Analysis ◽  
Wave Source ◽  
Delay Term ◽  
Position Sensing ◽  
3D Space ◽  
Sensing Systems ◽  
Wave Bursts

Abstract This paper presents a novel formulation for the conceptual model for the estimation of the coordinates of a wave source based on the differences in the time-of-flights (TOFs) to various receivers fixed in 3D space. 3D position sensing using wave sources is typically done by triangulating the position of the wave source using the actual TOFs to the various receivers. There are two problems with such a formulation. The first one deals with synchronizing the wave bursts from the transmitter so as to measure the TOFs to the receivers. Further, this measured TOF incorporates delays that have to be subtracted from the measured TOFs to obtain the actual TOFs. Identification of this time delay term is the second problem. The formulation presented in this paper takes the differences in the TOFs to the various receivers, which circumvents both the problems. Typical applications that will benefit from this technology are 3D position sensing systems that may be used in robotics, navigation of autonomously guided vehicles, tracking of objects for virtual reality cells, and vibration analysis.

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