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.

Cavity Beam Position Monitor Test System Based on Virtual Instrument

2013 ◽  
Vol 333-335 ◽  
pp. 2354-2357
Author(s):  
Bao Peng Wang ◽  
Yong Bin Leng ◽  
Wei Min Zhou ◽  
Lu Yang Yu ◽  
Ying Bing Yan
Keyword(s):  
Virtual Instrument ◽  
Processing System ◽  
Test System ◽  
Beam Position Monitor ◽  
Signal Processing System ◽  
Beam Position ◽  
Instrument Control ◽  
Instrument Technology ◽  
Soft Architecture ◽  
Cavity Beam Position Monitor

Based on the virtual instrument technology, a dedicated test system has been developed for cavity beam position monitor (CBPM). The system consists of commercial nanopositioning stage and its controller, the analog output DAQ card based on PXI and network analyzer. In the LABVIEW environment, software which implemented function of instrument control and data acquisition based on virtual instrument soft architecture (VISA) has been developed. Experimental results illustrated that the test system achieved positioning precision of sub micron which meets requirement of test of CBPM. Also it could serve CBPM signal processing system.

Design of FMCW Radar Data Acquisition and Signal Processing System Based on Labview

2014 ◽  
Vol 496-500 ◽  
pp. 1881-1884 ◽  
Author(s):  
Jian Wei Leng ◽  
Chuan Bin Shan
Keyword(s):  
Signal Processing ◽  
Data Acquisition ◽  
Virtual Instrument ◽  
Processing System ◽  
Test System ◽  
Signal Source ◽  
Frequency Signal ◽  
Signal Processing System ◽  
Fmcw Radar ◽  
Data Acquisition Card

For virtual instrument technologys character of high performance, easy to implement hardware and software integration, etc., virtual instrument technology and Labview are applied to test fields. Using computer and NI PCI-6221 data acquisition card as the hardware and LabVIEW8.5 software as a development platform, a data acquisition and signal processing virtual test system is built. The system is consisted of signal source and the signal processing module, in which the signal source is he FMCW radar level differential frequency signal connected by data acquisition card; signal processing section includes a time-domain measurement signal source, waveform display, filtering, spectral analysis, etc. Connecting, analysis and processing of FMCW radar level meter difference frequency signal are completed.

Study on stress testing of ferromagnetic materials based on magnetic anisotropy

2022 ◽  
Vol 64 (1) ◽  
pp. 45-49
Author(s):  
Ruilei Zhang ◽  
Ziyang Gong ◽  
Zhongchao Qiu ◽  
Yuntian Teng ◽  
Zhe Wang
Keyword(s):  
Magnetic Anisotropy ◽  
Stress Testing ◽  
Processing System ◽  
Ferromagnetic Materials ◽  
Testing System ◽  
Destructive Testing ◽  
Signal Processing System ◽  
System A ◽  
Zn Ferrite ◽  
Testing Experiment

The stress testing and evaluation of ferromagnetic materials that are widely applied in engineering has always been a focus of, and presented difficulties for, non-destructive testing. As there is still no effective method for detecting the stress of ferromagnetic materials, this paper puts forward the idea of applying the magnetic anisotropy method based on the inverse magnetostriction effect in stress testing of ferromagnetic materials. According to the principle of the magnetic anisotropy method, this paper discusses the development of Mn-Zn ferrite probes of three different structures, the construction of a magnetic anisotropy testing system comprising an excitation system, a signal collecting system and a signal processing system and the way in which a testing experiment was conducted on a 16MnR steel plate specimen under different conditions of stress, frequency and excitation voltage. All three types of probe can effectively determine the stress location of the specimen and present different phenomena and characteristics of the test. According to the experiment, significant correlation is seen between the stress and the magnetic signal, which provides a new idea for stress testing of ferromagnetic materials.

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.

Body Effect Measurement in DRAM Cell Transistor Using Memory Test System

2016 ◽  
Author(s):  
Ilwoo Jung ◽  
Byoungdeok Choi ◽  
Bonggu Sung ◽  
Daejung Kim ◽  
Ilgweon Kim ◽  
...  
Keyword(s):  
Conventional Method ◽  
Cell Body ◽  
Test System ◽  
Memory Test ◽  
Effect Measurement ◽  
Nondestructive Measurement ◽  
Individual Values ◽  
Body Effect ◽  
Sample Damage ◽  
Viable Method

Abstract Body effect is the key characteristic of DRAM cell transistor. Conventional method uses a TEG structure for body effect measurement. But this measurement is not accurate, because TEG structure has only several transistors and it is located outside of the DRAM die. This paper suggests a viable method for measuring DRAM cell transistor body effect. It uses a memory test system for fast, massive, nondestructive measurement. Newly developed method can measure 100,000 DRAM cell body effects in two minute, without sample damage. The test gives one median value and 100,000 individual values of body effects. Median value of measured body effects is equal to the TEG body effect. An individual DRAM cell body effect has a correlation with the fin height.

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