scholarly journals Design and Implementation of a Novel Measuring Scheme for Fiber Interferometer Based Sensors

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4080 ◽  
Author(s):  
Chao-Tsung Ma ◽  
Cheng-Ling Lee ◽  
Yan-Wun You
Keyword(s):  
Electromagnetic Interference ◽  
Processing System ◽  
Optical Power ◽  
Measuring System ◽  
Physical Parameters ◽  
Long Distance ◽  
Signal Processing System ◽  
Practical Applications ◽  
Interference Spectrum ◽  
Measuring Scheme

This paper presents a novel measuring scheme for fiber interferometer (FI) based sensors. With the advantages of being small sizes, having high sensitivity, a simple structure, good durability, being easy to integrate fiber optic communication and having immunity to electromagnetic interference (EMI), FI based sensing devices are suitable for monitoring remote system states or variations in physical parameters. However, the sensing mechanism for the interference spectrum shift of FI based sensors requires expensive equipment, such as a broadband light source (BLS) and an optical spectrum analyzer (OSA). This has strongly handicapped their wide application in practice. To solve this problem, we have, for the first time, proposed a smart measuring scheme, in which a commercial laser diode (LD) and a photodetector (PD) are used to detect the equivalent changes of optical power corresponding to the variation in measuring parameters, and a signal processing system is used to analyze the optical power changes and to determine the spectrum shifts. To demonstrate the proposed scheme, a sensing device on polymer microcavity fiber Fizeau interferometer (PMCFFI) is taken as an example for constructing a measuring system capable of long-distance monitoring of the temperature and relative humidity. In this paper, theoretical analysis and fundamental tests have been carried out. Typical results are presented to verify the feasibility and effectiveness of the proposed measuring scheme, smartly converting the interference spectrum shifts of an FI sensing device into the corresponding variations of voltage signals. With many attractive features, e.g., simplicity, low cost, and reliable remote-monitoring, the proposed scheme is very suitable for practical applications.

scholarly journals A Review of Machine Vision-Based Structural Health Monitoring: Methodologies and Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
X. W. Ye ◽  
C. Z. Dong ◽  
T. Liu
Keyword(s):  
Structural Health Monitoring ◽  
Machine Vision ◽  
Health Monitoring ◽  
Electromagnetic Interference ◽  
State Inspection ◽  
Physical Parameters ◽  
Long Distance ◽  
Structural Dynamic ◽  
Practical Applications ◽  
Structural Health

In the past two decades, a significant number of innovative sensing and monitoring systems based on the machine vision-based technology have been exploited in the field of structural health monitoring (SHM). This technology has some inherent distinctive advantages such as noncontact, nondestructive, long distance, high precision, immunity to electromagnetic interference, and large-range and multiple-target monitoring. A lot of machine vision-based structural dynamic measurement and structural state inspection methods have been proposed. Real-world applications are also carried out to measure the structural physical parameters such as the displacement, strain/stress, rotation, vibration, crack, and spalling. The purpose of this review article is devoted to presenting a summary of the basic theories and practical applications of the machine vision-based technology employed in structural monitoring as well as its systematic error sources and integration with other modern sensing techniques.

Electronics for SPring-8 X-ray beam monitors

1998 ◽  
Vol 5 (3) ◽  
pp. 630-631 ◽  
Author(s):  
Togo Kudo ◽  
Hideki Aoyagi ◽  
Hideaki Shiwaku ◽  
Yoshiharu Sakurai ◽  
Hideo Kitamura
Keyword(s):  
Processing System ◽  
Measuring System ◽  
Signal Processing System ◽  
Beam Position ◽  
X Ray ◽  
Current Voltage ◽  
Highly Sensitive ◽  
Position Data ◽  
Current Measuring ◽  
A Current

A sensitive current-measuring system is required to construct a highly sensitive X-ray beam-position monitor (XBPM). A current–voltage converter (I/V) which can measure currents between 0.1 nA and 10 mA was designed, and the signal processing system of the XBPM was constucted using this I/V. This system was used in beamline commissioning. Beam-position data standard deviations of σ ≃ 3 µm for the bending-magnet beamline, and σ x ≃ 3 µm and σ y ≃ 1 µm for the insertion-device beamline were obtained during the beamline commissioning.

scholarly journals Simultaneous dual true random numbers generator

DYNA ◽  
2016 ◽  
Vol 83 (195) ◽  
pp. 93-98 ◽  
Author(s):  
Josue Aaron Lopez Leyva ◽  
Arturo Arvizu-Mondragón
Keyword(s):  
Random Sequence ◽  
Processing System ◽  
Optical Power ◽  
Digital Signal ◽  
Random Numbers ◽  
Signal Processing System ◽  
Independent Manner ◽  
Voltage Signal ◽  
Sequence Generator ◽  
Random Nature

This paper details the design and implementation of a simultaneous dual true random numbers generator using only one laser and a digital signal processing system with a DE0 Nano FPGA. We implemented the random generator in such a way that a vacuum optical field will exist in our system. Taking advantage of the inherently random nature of the field, simultaneously quadrature components are measured in order to generate a truly random voltage signal. Also, we used a dynamical system of statistical analysis to eliminate any residual component of direct current on output voltage signal due to an (unavoidable) optical power imbalance in the optical system that was implemented. Finally, were measured the parameters of the auto-correlation and bias probability with values of 0.00010, 0002, respectively, which means that our system can be considered as a true random sequence generator capable of producing two sequences in an independent manner with a bit rate of up to 25 MHz.

scholarly journals THE SYNTHESIS OF AN OPTICAL THREE-BEAM OZONE SENSOR MODEL

2021 ◽  
pp. 148-152
Author(s):  
Kiselov Yehor ◽  
Aleksiievskyi Dmytro ◽  
Turyshev Kostiantyn
Keyword(s):  
Measurement Error ◽  
Modulation Frequency ◽  
Processing System ◽  
Working Environment ◽  
Measuring System ◽  
Optical Channel ◽  
Signal Processing System ◽  
Sensor Model ◽  
Simulink Simulation ◽  
Ozone Measurement

The synthesis of an optical three-beam ozone sensor model for the Matlab Simulink simulation is performed. The structure of the sensor signal processing system is proposed. The simulation of the measuring system noise resistance is carried out on the basis of the developed visual block model. The dependence of the measurement error on the modulation frequency of the radiation in the optical channel is obtained. The operation modes are determined to minimize the ozone measurement error. It is shown that the precision of determining the ozone concentration in the working environment can be achieved at the level of 99.9% using the obtained results.

scholarly journals An Improved Transmissive Method of Stress Nondestructive Measurement Based on Inverse Magnetostrictive Theory for the Ferromagnetic Material

2021 ◽  
Vol 7 (7) ◽  
pp. 106
Author(s):  
Jiewei Zeng ◽  
Yunsong Xu ◽  
Shi Liang ◽  
Zhiqiang Long
Keyword(s):  
Internal Stress ◽  
Electromagnetic Interference ◽  
Processing System ◽  
Ferromagnetic Material ◽  
Test System ◽  
Ferromagnetic Materials ◽  
Internal Stresses ◽  
Nondestructive Measurement ◽  
Signal Processing System ◽  
Technical Requirements

In order to meet the technical requirements of non-destructive measurement for the internal stress of ferromagnetic materials represented by cold-rolled steel sheets during the rolling control process, the paper presents a novel method for the nondestructive measurement of ferromagnetic materials based on inverse magnetostrictive principle. By improving the traditional U-shaped sensor, a transmissive quadrapole layout is proposed. The corresponding excitation module and fast signal processing system for dynamic measurement were developed and the test system for detecting innerstress of ferromagnetic material was constructed in the laboratory. The relationship between the magnetic flux with the principal stress was found by experimental investigation and the sensitive correlation of the two was verified under the laboratory measurement conditions without strong electromagnetic interference. The influence of measurement results by sensor parameters such as sensor angle, amplitude of excitation current, variation of air gap were discussed in detail and a method was proposed to decrease the power supply instability caused by the change of the airgap. The experimental results show that the transmission quadrupole layout makes the test system exhibit a good linear response to the internal stress in the specimen. The feasibility of the magnetic detection method of internal stresses in ferromagnetic material was verified through the experiment.

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

scholarly journals Polymer Optical Waveguide Sensor Based on Fe-Amino-Triazole Complex Molecular Switches

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 195
Author(s):  
Muhammad Shaukat Khan ◽  
Hunain Farooq ◽  
Christopher Wittmund ◽  
Stephen Klimke ◽  
Roland Lachmayer ◽  
...  
Keyword(s):  
Molecular Complex ◽  
Electromagnetic Interference ◽  
Optical Power ◽  
Uv Curing ◽  
Molecular Complexes ◽  
Core Material ◽  
Absorption Bands ◽  
Electronic Temperature ◽  
Polymer Waveguide ◽  
Temperature Detection

We report on a polymer-waveguide-based temperature sensing system relying on switchable molecular complexes. The polymer waveguide cladding is fabricated using a maskless lithographic optical system and replicated onto polymer material (i.e., PMMA) using a hot embossing device. An iron-amino-triazole molecular complex material (i.e., [Fe(Htrz)2.85(NH2-trz)0.15](ClO4)2) is used to sense changes in ambient temperature. For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification. The absorption spectrum of the molecular complex in the UV/VIS light range features two prominent absorption bands in the low-spin state. As temperature approaches room temperature, a spin-crossover transition occurs, and the molecular complex changes its color (i.e. spectral properties) from violet-pink to white. The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 °C and sensitivity of 0.08 mW/°C. This enables optical rather than electronic temperature detection in environments where electromagnetic interference might influence the measurements.

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