Design and Implementation of a Kind of Ship Underwater Electric Field Signal Collection Equipment Hardware

2014 ◽  
Vol 945-949 ◽  
pp. 2102-2105 ◽  
Author(s):  
Xiao Bei Wang ◽  
Li Xia ◽  
Xiang Jun Wang ◽  
Yi Liu
Keyword(s):  
Electric Field ◽  
Low Noise ◽  
Electric Signal ◽  
Instrumentation Amplifier ◽  
Signal Acquisition ◽  
Three Dimension ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Signal Collection ◽  
Low Pass

Based on the characteristics that ship underwater electric signal is waek, a kind of ship underwater electric signal acquisition equipment of hardware structure is designed. With instrumentation amplifier of high-precision and low noise and low pass filter module, the electric field signal collected by three dimension sensor is filtered and amplified. It ensures the integrity and validity of acquisition signal.

scholarly journals Wearable Active Electrode for sEMG Monitoring Using Two-Channel Brass Dry Electrodes with Reduced Electronics

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
J. Antonio Ruvalcaba ◽  
M. I. Gutiérrez ◽  
A. Vera ◽  
L. Leija
Keyword(s):  
Sports Medicine ◽  
Clinical Analysis ◽  
Skin Impedance ◽  
Signal Acquisition ◽  
Wrist Flexion ◽  
Semg Signal ◽  
Active Electrode ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Gel-based electrodes are employed to record sEMG signals for prolonged periods. These signals are used for the control of myoelectric prostheses, clinical analysis, or sports medicine. However, when the gel dries, the electrode-skin impedance increases considerably. Using dry active electrodes (AEs) to compensate variations of impedance is an alternative for long-term recording. This work describes the optimization of the electronic design of a conventional AE by removing the impedance coupling stage and two filters. The proposed work consisted of 5 stages: electrodes, amplification (X250), 2.2 Vdc offset, low-pass filter, and ADC with USART communication. The device did not need the use of electrolytic gel. The measurements of CMRR (96 dB), amplitude of the output sEMG signal (∼1.6 Vp-p), and system bandwidth (15–450 Hz) were performed in order to confirm the reliability of the device as an sEMG signal acquisition system. The SNR values from seven movements performed by eleven volunteers were compared in order to measure the repeatability of the measurements (average 30.32 dB for a wrist flexion). The SNR for wrist flexion measured with the proposed and the commercial system was compared; the values were 49 dB and 60 dB, respectively.

Electrical conductivity and capacitance spectra of Bi1.37Sm0.13Zn0.92Nb1.50O6.92 pyrochlore ceramic in the range of 0–3 GHz

2014 ◽  
Vol 07 (02) ◽  
pp. 1450018 ◽  
Author(s):  
A. F. Qasrawi ◽  
Faten M. Bzour ◽  
Eman O. Nazzal ◽  
A. Mergen
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
Dielectric Breakdown ◽  
Microwave Cavity ◽  
Frequency Range ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Microwave Cavities ◽  
Rejection Filter ◽  
Low Pass

In this work, the electrical properties of samarium-doped bismuth niobium zinc oxide ( Sm -doped BZN ) pyrochlore ceramics are investigated by means of temperature dependent electrical conductivity and capacitance spectroscopy in the frequency range of 0–3 GHz. It was observed that the novel dielectric Sm - BZN ceramic exhibits a temperature and electric field dependent dielectric breakdown. When measured at 300 K, the breakdown electric field is 1.12 kV/cm and when heated the breakdown temperature is ~ 420 K. The pyrochlore is thermally active above 440 K with conductivity activation energy of 1.37 eV. In addition, the room temperature capacitance spectra reflected a resonance–antiresonance switching property at 53 MHz when subjected to an AC signal of low power of 5 dBm. Furthermore, when the Sm - BZN ceramics are used as microwave cavity and tested in the frequency range of 1.0–3.0 GHz, the cavity behaves as low pass filter with wide tunability up to a frequency of 1.91 GHz. At this frequency it behaves as a band rejection filter that blocks waves of 1.91 GHz and 2.57 GHz frequencies. These properties of the Sm -doped BZN are promising as they indicate the usability of the ceramics in digital electronic circuits as resonant microwave cavities suitable for the production of low pass/rejection band filters.

APPLICATION OF THE PLL CONTROL AT THE REALIZATION OF A 16-THROUGH ADC

2018 ◽  
pp. 6-12 ◽  
Author(s):  
R. V. Magerramov
Keyword(s):  
Electronic Device ◽  
Phase Locked Loop ◽  
Low Noise ◽  
Phase Detector ◽  
Modern World ◽  
Voltage Controlled Oscillator ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Analog To Digital ◽  
Low Pass

This article describes the method of converting an analog signal into a digital code using a phase locked loop (PLL) circuit. The functional structure of the voltage-to-digital conversion circuit is considered. The application of the principle of phase-locked loop for controlling the duty cycle of the output signal of a phase detector when the voltage at the positive input of the operational amplifier included in the low-pass filter is investigated. In the modern world, analog-to-digital converters (ADCs) are available in almost every electronic device. The application of different ADC architectures is determined by their parameters and features by circuit and technological implementation. The phase-locked loop with a digital part (16-bit counter, storage register and data transfer interface) allows to obtain a precision analog-to-digital converter, based on a relatively simple circuit design, which has high accuracy and low noise level. Negative feedback of the PLL loop makes it possible to level the error of the passive elements of the low-pass filter (LPF) and the voltage controlled oscillator (VCO). The result of this work is an analysis of the ADC characteristics in the technological basis of 250 nm.

A Method of Acquiring and Processing GIC Signal in High-Speed Rail Track Circuit

2014 ◽  
Vol 1070-1072 ◽  
pp. 755-758
Author(s):  
Yun Feng Ma ◽  
Wei Zong
Keyword(s):  
High Speed ◽  
Signal Acquisition ◽  
High Speed Rail ◽  
High Speed Railway ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Rail Track ◽  
Sampled Signal ◽  
Low Pass ◽  
Track Circuit

The high-speed railway is a typical ground systems, if subjected to a larger GIC, will lead to serious incidents. For the power supply and wiring pattern of high-speed railway is different from the public grid, then how to monitor the GIC impact on the high-speed rail electrical systems need to be studied. The paper study the process and pattem of GIC in high-speed rail track circuit, and propose a signal acquisition method of GIC in the track circuit. The sampled signal will be go through the low-pass filter designed by the window function to obtain the GIC.

Data Acquisition System Connect to CMG-3T Low-Frequency Seismic Pendulum

2013 ◽  
Vol 734-737 ◽  
pp. 2945-2948
Author(s):  
Ting Ting Liu ◽  
Yong Wu ◽  
Jun Lin
Keyword(s):  
Data Acquisition ◽  
Seismic Waves ◽  
Low Frequency ◽  
Data Acquisition System ◽  
Low Noise ◽  
Acquisition System ◽  
Power Module ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

Aiming at the low-frequency performance of the lowfrequency seismic pendulum CMG -3T, we design a data acquisition system can acquire the low-frequency seismic waves, at the same time we accomplish the process of adjusting the CMG-3T. This paper gives designing scheme include the low noise design of the power module, the design of the connector to RS232 which can send command to adjusting the mass of CMG-3T,the design of voltage attenuation network and no-source low-pass filter network of data acquisition system, the last is the design of software for adjusting the CMG-3T.

A 0.18-μm CMOS low-noise highly linear continuous-time seventh-order elliptic low-pass filter

2005 ◽  
Author(s):  
Juan F. Fernandez-Bootello ◽  
Manuel Delgado-Restituto ◽  
Angel Rodriguez-Vazquez
Keyword(s):  
Continuous Time ◽  
Low Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Seventh Order
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