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 New Capacitance Multiplier Structure with High Multiplication Factor for Ultra-Low-Frequency Filter in Biomedical Applications

2019 ◽  
Vol 29 (07) ◽  
pp. 2050109
Author(s):  
Yan Li ◽  
Yong Liang Li
Keyword(s):  
Biomedical Applications ◽  
Low Frequency ◽  
Multiplication Factor ◽  
Frequency Filter ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Physiological Signal ◽  
Wide Range ◽  
Low Pass ◽  
Capacitance Multiplier

A novel capacitance multiplier is proposed to implement an ultra-low-frequency filter for physiological signal processing in biomedical applications. With the proposed multiplier, a simple first-order low-pass filter achieves a [Formula: see text]3-dB frequency of 33.4[Formula: see text]μHz with a 1-pF capacitance and a 20[Formula: see text]k[Formula: see text] resistance. This corresponds to a multiplication factor of as large as [Formula: see text]. By changing the controlling terminal, the [Formula: see text]3-dB frequency can be tuned in a wide range of 33.4[Formula: see text]μHz–6.3[Formula: see text]kHz.

A 0.3 V, 56 dB DR, 100 Hz fourth order low-pass filter for ECG acquisition system

2019 ◽  
Vol 94 ◽  
pp. 104652 ◽  
Author(s):  
P. Sreenivasulu ◽  
G. Hanumantha Rao ◽  
S. Rekha ◽  
M.S. Bhat
Keyword(s):  
Fourth Order ◽  
Acquisition System ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

A New Design of Signal Source for Crosstalk Test of Multi-Channel Data Acquisition System

2012 ◽  
Vol 246-247 ◽  
pp. 1012-1016 ◽  
Author(s):  
Yan Hu Shan ◽  
Yong Feng Ren ◽  
Guo Yong Zhen ◽  
Xin Quan Jiao
Keyword(s):  
Phase Shift ◽  
Data Acquisition ◽  
Low Frequency ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Signal Source ◽  
Testing Method ◽  
System A ◽  
Rectangular Waveform ◽  
Effective Channel

For the multi-channel data acquisition system, crosstalk significantly affects the sample accuracy. Through analyzing the mode of multiplexer and the sampling timing sequence, we demonstrated that crosstalk effect mainly results from the switch of multiplexer for the low- frequency multi-channel data acquisition system. A new crosstalk testing method based on phase-shift rectangular waveform for the multi-channel data acquisition system was proposed. The phase-shift rectangular waveform was designed. Experiments were conducted to test crosstalk effect of the multi-channel data acquisition system. The experimental results were demonstrated that the proposed approach based on the phase-shift rectangular waveform exhibits a distinct feature in effective channel crosstalk testing, compared with waveforms of other types. Thus, the proposed method is effective to detect crosstalk of the multi-channel data acquisition system.

Multiple 6C-station Huddle Test in Fürstenfeldbruck, Germany

2020 ◽  
Author(s):  
Gizem Izgi ◽  
Stefanie Donner ◽  
Felix Bernauer ◽  
Daniel Vollmer ◽  
Klaus Stammler ◽  
...  
Keyword(s):  
Seismic Waves ◽  
Sampling Rate ◽  
High Sensitivity ◽  
Coherent Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Federal Institute ◽  
Rotational Components ◽  
Low Pass ◽  
Rotational Motions

<p>Rotational motions play a key role in measuring seismic wavefield properties. To fully understand and describe the behavior of seismic waves, both translational and rotational components should be properly investigated. Portable blueSeis-3A (iXblue) sensors allow to measure 3 components of rotational motions with high sensitivity in a frequency range from 0.001 Hz to 50 Hz.</p><p align="justify">A huddle test was performed in Fürstenfeldbruck, Germany by the University of Potsdam in collaboration with the Ludwig-Maximilians University of Munich (LMU) and Federal Institute for Geosciences and Natural Resources (BGR) between 26 of August and 02 of September 2019, in order to further investigate the performance of multiple rotational instruments in combination with seismometers. Within the scope of this test, 5 rotational and 3 translational sensors were deployed on the basement of the observatory on decoupled plinth. Our preliminary results show good correlation between all components and rotational sensors. To investigate the coherent noise between sensors, we applied a 50 Hz low-pass filter and 100 Hz sampling rate. To better illustrate, probabilistic power spectral densities and spectrograms have been created. In general, we will discuss the reliability of the data recorded by rotational sensors for further investigations.</p><p> </p>

Design of the Broadband Standard Signal Generator for Laser Locating System of the Mine Hoisting Container

2013 ◽  
Vol 427-429 ◽  
pp. 2033-2036
Author(s):  
Di Fan ◽  
Yan Gao ◽  
Yue Zhao
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
Frequency Standard ◽  
Analog Filters ◽  
Laser Ranging ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Noise Disturbance ◽  
Standard Signal ◽  
Low Pass

As the key junction between the ground and underground, hoisting systems as well as mines themselves are of vital importance to coalmine production. Laser ranging method is studied as a new solution of getting the real-time position directly. Furthermore, multi-scale phase based laser ranging principles are utilized in the system. The paper is aimed to conduct research into the problems existing in standard signal generating while using laser to locating the hoisting container, and to design standard sine generator circuits with DDS technology and DDS devices AD9850 to generate multiple frequency standard signals. In view of the serious noise disturbance in high frequency output, 4-order Chebyshev low-pass filter is designed, by using the integrated analog filters LT 6600-15, to filter the sine signals from AD9850 and to effectively weaken the noise disturbance. The established practical circuits are tested, obtaining trillion level high frequency and low frequency sine signals and fulfilling the requirements for the location system of hoisting containers.

scholarly journals Artefactual origin of biphasic cortical spike-LFP correlation

2016 ◽  
Author(s):  
Michael Okun
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Pass Filter ◽  
Neural Data ◽  
Data Acquisition Systems ◽  
Electrophysiological Data ◽  
High Pass Filter ◽  
High Pass

AbstractElectrophysiological data acquisition systems introduce various distortions into the signals they record. While such distortions were discussed previously, their effects are often not appreciated. Here I show that the biphasic shape of cortical spike-triggered LFP average (stLFP), reported in multiple studies, is likely an artefact introduced by high-pass filter of the neural data acquisition system when the actual stLFP has a single trough around the zero lag.

scholarly journals Inductanceless high order low frequency filters for medical applications

2022 ◽  
Vol 12 (2) ◽  
pp. 1299
Author(s):  
Noor Thamer Almalah ◽  
Faris Hasan Aldabbagh
Keyword(s):  
Integrated Circuit ◽  
Low Frequency ◽  
Negative Resistance ◽  
Acceptable Result ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Transconductance Amplifier ◽  
Low Pass ◽  
Minimum Number ◽  
Order Butterworth Filter

<p>In this paper, a designed circuit used for low-frequency filters is implemented and realized the filter is based on frequency-dependent negative resistance (FDNR) as an inductor simulator to substitute the traditional inductance, which is heavy and high cost due to the coil material manufacturing and size area. The simulator is based on an active operation amplifier or operation transconductance amplifier (OTA) that is easy to build in an integrated circuit with a minimum number of components. The third and higher-order Butterworth filter is simulated at low frequency for low pass filter to use in medical instruments and low-frequency applications. The designed circuit is compared with the traditional proportional integral controller enhanced (PIE) and T section ordinary filter. The results with magnitude and phase response were compared and an acceptable result is obtained. The filter can be used for general applications such as medical and other low-frequency filters needed.</p>

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.

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