A Practical Signal Progressing Method for Magnetic Flux Leakage Testing

2014 ◽  
Vol 599-601 ◽  
pp. 782-785
Author(s):  
Zhang Wei Ling ◽  
Wei Yong Cai ◽  
Si Hai Li ◽  
Chao Li
Keyword(s):  
Magnetic Flux ◽  
Digital Signal ◽  
Absolute Error ◽  
Magnetic Flux Leakage ◽  
Band Pass Filter ◽  
Maximum Absolute Error ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Flux Leakage

The magnetic flux leakage (MFL) testing, as a modern nondestructive testing technology, requires fast and accurate signal progressing methods. A practical signal progressing method for MFL testing was presented, especially for tank floor MFL testing. According to the FFT result of the original signal, a difference amplifier and a low-pass filter were designed in the hardware signal progressing. In the digital signal progressing, a numerical differential progress and an IIR band-pass filter were adopted. Experimental results show that the presented method could effectively eliminate noise. Defect depth measuring results show that, for the 8 mm thickness specimen, the maximum absolute error of depth is 0.23 mm, which means 2.8 % of the 8 mm thickness.

Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS

2013 ◽  
Vol 273 ◽  
pp. 371-374
Author(s):  
Bao Ping Li ◽  
Yan Liang Zhang
Keyword(s):  
Stop Band ◽  
Center Frequency ◽  
Pass Band ◽  
Band Pass Filter ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Compact Size ◽  
Low Pass

Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.

LC-Resonant and High-Temperature Resistant Acceleration Sensor Based on DSP

2011 ◽  
Vol 105-107 ◽  
pp. 1966-1969
Author(s):  
Tao Guo ◽  
Jie Zhu ◽  
Gui Tang ◽  
Yan Xu
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Space Shuttle ◽  
Digital Signal ◽  
Acceleration Sensor ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog To Digital ◽  
Acceleration Sensors ◽  
Low Pass

It is a challenging problem to test the acceleration of the high-speed missiles and space shuttle under high temperature. This paper proposed a design of LC-resonant and high-temperature resistant acceleration sensors about the phenomenon. With the operational amplifier OP4177, it produces the input signal that contents with A/D (Analog to Digital) signal. An eight level low-pass filter MAX291 is used for testing after the signal is regulated. This design mainly uses AD7934 to complete the conversion from analog signals to digital signals. It also recognizes the resonant point of LC acceleration sensor by the DSP （Digital Signal Processing）recognizing program. The acceleration is computed finally by the DSP chip.

scholarly journals High-Performance RF Balanced Microstrip Mixer Configuration for Cryogenic and Room Temperatures

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 102
Author(s):  
Noy Citron ◽  
Eldad Holdengreber ◽  
Oz Sorkin ◽  
Shmuel E. Schacham ◽  
Eliyahu Farber
Keyword(s):  
High Performance ◽  
Schottky Diodes ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Noise Rejection ◽  
Low Pass ◽  
Hybrid Coupler ◽  
Band Pass ◽  
Simulation Results

A high-performance S-band down-conversion microstrip mixer, for operation from 77 K to 300 K, is described. The balanced mixer combines a 90 degree hybrid coupler, two Schottky diodes, a band pass filter, and a low pass filter. The coupler phase shift drastically improves noise rejection. The circuit was implemented according to the configuration obtained from extensive simulation results based on electromagnetic analysis. The experimental results agreed well with the simulation results, showing a maximum measured insertion loss of 0.4 dB at 2 GHz. The microstrip mixer can be easily adjusted to different frequency ranges, up to about 50 GHz, through the proper choice of microstrip configuration. This novel S-band cryogenic mixer, implemented without resorting to special components, shows a very high performance at liquid nitrogen temperatures, making this mixer very suitable for high-temperature superconductive applications, such as front-ends.

scholarly journals CMOS CDBA-Based Inverse Filter Structure

2020 ◽  
Vol 9 (3) ◽  
pp. 2226-2231
Keyword(s):  
Cmos Technology ◽  
Experimental Results ◽  
Band Pass Filter ◽  
Inverse Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Filter Structure ◽  
Low Pass ◽  
Band Pass ◽  
High Pass

This paper presents a voltage-mode(VM) tunable multifunction inverse filter configuration employing current differencing buffered amplifiers (CDBA). The presented structure utilizes two CDBAs, two/three capacitors and four/five resistors to realize inverse low pass filter (ILPF), inverse high pass filter (IHPF), inverse band pass filter (IBPF), and inverse band reject filter(IBRF) from the same circuit topology by suitable selection(s) of the branch admittances(s). PSPICE simulations have been performed with 0.18µm TSMC CMOS technology to validate the theory. Some sample experimental results have also been provided using off-the-shelf IC AD844 based CDBA.

scholarly journals A Novel Approach To Diagnosis Of Analog Circuit Incipient Faults Based On KECA And OAO LSSVM

2015 ◽  
Vol 22 (2) ◽  
pp. 251-262 ◽  
Author(s):  
Chaolong Zhang ◽  
Yigang He ◽  
Lei Zuo ◽  
Jinping Wang ◽  
Wei He
Keyword(s):  
Analog Circuit ◽  
Support Vector ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Op Amp ◽  
Novel Approach ◽  
Low Pass ◽  
Diagnosis Accuracy ◽  
Incipient Fault

Abstract Correct incipient identification of an analog circuit fault is conducive to the health of the analog circuit, yet very difficult. In this paper, a novel approach to analog circuit incipient fault identification is presented. Time responses are acquired by sampling outputs of the circuits under test, and then the responses are decomposed by the wavelet transform in order to generate energy features. Afterwards, lower-dimensional features are produced through the kernel entropy component analysis as samples for training and testing a one-against-one least squares support vector machine. Simulations of the incipient fault diagnosis for a Sallen-Key band-pass filter and a two-stage four-op-amp bi-quad low-pass filter demonstrate the diagnosing procedure of the proposed approach, and also reveal that the proposed approach has higher diagnosis accuracy than the referenced methods.

Construction of a High-Pass Digital Filter from a Low-Pass Digital Filter

1994 ◽  
Vol 10 (4) ◽  
pp. 374-381 ◽  
Author(s):  
Stephen D. Murphy ◽  
D. Gordon E. Robertson
Keyword(s):  
Digital Filter ◽  
Low Frequency ◽  
Frequency Noise ◽  
Band Pass Filter ◽  
Low Frequency Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
High Pass Filter ◽  
Low Pass ◽  
High Pass

To remove low-frequency noise from data such as DC-bias from electromyo-grams (EMGs) or drift from force transducers, a high-pass filter was constructed from a low-pass filter of known characteristics. A summary of the necessary steps required to transform the low-pass digital were developed. Contaminated EMG and force platform data were used to test the filter. The high-pass filter successfully removed the low-frequency noise from the EMG signals. The high-pass filter was then cascaded with the low-pass filter to produce a band-pass filter to enable simultaneous high- and low-frequency noise reduction.

scholarly journals Implementation of an Inductorless 5th Order Band-Pass Filter

2021 ◽  
Author(s):  
Ara Abdulsatar Assim Assim
Keyword(s):  
Communication Systems ◽  
Order Approximation ◽  
Design Procedure ◽  
Operational Amplifiers ◽  
Band Pass Filter ◽  
Analog Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Band Pass

This paper demonstrates the design and implementation of an inductorless analog band-pass filter (BPF). Band-pass filters are widely used in communication systems, wireless transceivers and audio systems, they only pass signals within a desired frequency range. The principles mentioned in this article can be generalized to design any analog filter regardless of its order, approximation and prototype. The design procedure can be broken down into three main parts, first of all, a passive low-pass filter (LPF) is implemented, then the passive LPF is converted into a passive BPF. Finally, the passive BPF is transformed into an active BPF by adding operational amplifiers. The active BPF is then modified into two different topologies, the first in which the inductors are replaced with simulated- inductors (gyrators), while in the second topology, less operational amplifiers are used. <br>

scholarly journals RANCANG BANGUN MODUL PRAKTIKUM APLIKASI OP-AMP BERBASIS IC 741 DAN IC 301

Foristek ◽  
2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Wahyu Rizal Nugraha ◽  
Tan Suryani Sollu ◽  
Ardi Amir
Keyword(s):  
Input Voltage ◽  
Tool Support ◽  
Band Pass Filter ◽  
Function Generator ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Op Amp ◽  
Band Stop Filter ◽  
Low Pass ◽  
Input Waveform

The objective of this research is to design and create a practicum application of op-amp (operational amplifier) based on IC 741 and IC 301. By adding the components R (Resistor) C (Capacitor) IC op-amp can be applied into several series. In this practical tool there are several modules of the experiment such as multiplier, the enumerator, deduction, comparison, integrator, differentiators. This tool also equipped with a series active filter such as low pass filter, high pass filter, band pass filter and band stop filter. This practical tools requires some tool support in the form of power supply as an input voltage, a function generator to generate signals with different shapes as desired in accordance with the requirements when the practical activities and the oscilloscope as a tool of reader input waveform and the output of the circuit that exist in practical tools. Practical activities and oscilloscopes as input and output wave reader from the circuits in the practicum

scholarly journals QIM - Based Audio Watermarking with Combination Technique of DCT-QR-CPT

2019 ◽  
Vol 7 (1) ◽  
pp. 112 ◽  
Author(s):  
RENDY DWI RENDRAGRAHA ◽  
GELAR BUDIMAN ◽  
IRMA SAFITRI
Keyword(s):  
Signal To Noise Ratio ◽  
Audio Watermarking ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Opinion Score ◽  
Low Pass ◽  
Band Pass ◽  
Speed Change ◽  
Index Modulation

ABSTRAKAudio watermarking adalah teknik memasukkan informasi ke dalam file audio dan untuk melindungi hak cipta data digital dari distribusi ilegal. Makalah ini memperkenalkan audio stereo watermarking berdasarkan Quantization Index Modulation (QIM) dengan teknik gabungan Discrete Cosine Transform (DCT) - QRCartesian Polar Transform (CPT). Host audio dibagi menjadi beberapa frame, selanjutnya setiap frame ditransformasi oleh DCT, kemudian output DCT diuraikan menjadi matriks orthogonal dan matriks segitiga menggunakan metode QR. Selanjutnya, CPT mengubah dua koefisien kartesian dari matriks segitiga (R) pada posisi (1,1) dan (2,2) menjadi koefisien polar. Setelah itu, penyisipan dilakukan pada koefisien polar oleh QIM. Hasil simulasi menunjukkan bahwa imperseptibilitas audio terwatermark berkualitas baik dengan Signal to Noise Ratio (SNR)> 20, Mean Opinion Score (MOS)> 4 dan tahan terhadap serangan seperti Low Pass Filter (LPF) dan Band Pass Filter (BPF) dengan cut off 25-6k, resampling, Linear Speed Change (LSC) dan MP3 Compression dengan rate diatas 64 kbps.Kata kunci: Audio Watermarking, CPT, DCT, QIM, QR ABSTRACTAudio watermarking is a technique for inserting information into an audio file and to protect the copyright of digital data from illegal distribution. This paper introduces a stereo audio watermarking based on Quantization Index Modulation (QIM) with combined technique Discrete Cosine Transform (DCT) – QR – Cartesian Polar Transform (CPT). Each frame of a host audio is transformed by DCT, then DCT output is decomposed using QR method. Next, CPT transform two cartesian coefficients from triangular matrix (R) in position (1,1) and (2,2) to polar coefficients. After that, embedding is executed on polar coefficients by QIM. The simulation result shows that the imperceptibility is good with Signal to Noise Ratio (SNR)>20, Mean Opinion Score (MOS)>4 and it is robust against attacks such as Low Pass Filter (LPF) and Band Pass Filter (BPF) with cut off 25-6k, Resampling, Linear Speed Change and MP3 Compression with rate 64 kbps and above. Keywords: Audio Watermarking, CPT, DCT, QIM, QR

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