An Analog Circuit Technique to Improve a Geophone Frequency Response for Application as Vibration Sensors

2020 ◽  
Author(s):  
Navid Hakimitoroghi ◽  
Rabin Raut ◽  
Mehrdad Mirshafiei ◽  
Ashutosh Bagchi
Keyword(s):  
Frequency Response ◽  
Analog Circuit ◽  
Vibration Sensors ◽  
Circuit Technique

scholarly journals Transparent and Flexible Vibration Sensor Based on a Wheel-Shaped Hybrid Thin Membrane

Micromachines ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1246
Author(s):  
Siyoung Lee ◽  
Eun Kwang Lee ◽  
Eunho Lee ◽  
Geun Yeol Bae
Keyword(s):  
Frequency Response ◽  
High Sensitivity ◽  
Vibration Sensor ◽  
Human Machine Interaction ◽  
High Transparency ◽  
Vibration Sensors ◽  
Low Stiffness ◽  
Machine Interaction ◽  
The Internet Of Things ◽  
Ultrathin Membranes

With the advent of human–machine interaction and the Internet of Things, wearable and flexible vibration sensors have been developed to detect human voices and surrounding vibrations transmitted to humans. However, previous wearable vibration sensors have limitations in the sensing performance, such as frequency response, linearity of sensitivity, and esthetics. In this study, a transparent and flexible vibration sensor was developed by incorporating organic/inorganic hybrid materials into ultrathin membranes. The sensor exhibited a linear and high sensitivity (20 mV/g) and a flat frequency response (80–3000 Hz), which are attributed to the wheel-shaped capacitive diaphragm structure fabricated by exploiting the high processability and low stiffness of the organic material SU-8 and the high conductivity of the inorganic material ITO. The sensor also has sufficient esthetics as a wearable device because of the high transparency of SU-8 and ITO. In addition, the temperature of the post-annealing process after ITO sputtering was optimized for the high transparency and conductivity. The fabricated sensor showed significant potential for use in transparent healthcare devices to monitor the vibrations transmitted from hand-held vibration tools and in a skin-attachable vocal sensor.

DESIGN OF -1/2n ORDER ANALOG FRACTANCE APPROXIMATION CIRCUIT USING CONTINUED FRACTIONS DECOMPOSITION

2012 ◽  
Vol 21 (04) ◽  
pp. 1250035 ◽  
Author(s):  
YAN LIU ◽  
YI-FEI PU ◽  
JI-LIU ZHOU ◽  
XIAO-DONG SHEN
Keyword(s):  
Fractional Calculus ◽  
Frequency Response ◽  
Experimental Evidence ◽  
Continued Fractions ◽  
Continued Fraction ◽  
Analog Circuit ◽  
Synthesis Method ◽  
Network Synthesis ◽  
Network Function ◽  
Amplitude Frequency Response

In order to solve the most important problem of the fractional calculus (FC) application, the realization of analog circuit of fractance, continued fraction theory is applied to design the -1/2n order analog fractance approximation circuit. The author presents a network function of ideal fractance and decomposes it in continued fractions (CFs) form to obtain the corresponding analog fractance approximation circuit. The new circuit consists of ordinary passive RC component through network synthesis method. Simulations are performed for the verification of the new circuit. Experimental evidence has proved that the performance of novel -1/2n order analog fractance approximation circuit is good in both amplitude-frequency response and phase-frequency response.

scholarly journals Fault Diagnosis of Nonlinear Analog Circuit Based on Generalized Frequency Response Function and LSSVM Classifier Fusion

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Jialiang Zhang
Keyword(s):  
Support Vector Machine ◽  
Fault Diagnosis ◽  
Frequency Response ◽  
Frequency Response Function ◽  
Analog Circuit ◽  
Least Square ◽  
Classifier Fusion ◽  
Support Vector ◽  
Response Functions ◽  
Nonlinear Analog

For fault diagnosis of nonlinear analog circuit, a novel method based on generalized frequency response function (GFRF) and least square support vector machine (LSSVM) classifier fusion is presented. The sinusoidal signal is used as the input of analog circuit, and then, the generalized frequency response functions are estimated directly by the time-domain formulations. The discrete Fourier transform of measurement data is avoided. After obtaining the generalized frequency response functions, the amplitudes of the GFRFs are chosen as the fault feature parameters. A classifier fusion algorithm based on least square support vector machine (LSSVM) is used for fault identification. Two LSSVM multifault classifiers with different kernel functions are constructed as subclassifiers. Fault diagnosis experiments of resistor-capacitance (RC) circuit and Sallen Key filter are carried out, respectively. The results show that the estimated GFRFs of the circuit are accurate, and the fault diagnosis method can get high recognition rate.

Jump Resonance in Fractional Order Circuits

2018 ◽  
Vol 28 (01) ◽  
pp. 1850016 ◽  
Author(s):  
Arturo Buscarino ◽  
Riccardo Caponetto ◽  
Carlo Famoso ◽  
Luigi Fortuna
Keyword(s):  
Frequency Response ◽  
Fractional Order ◽  
Analog Circuit ◽  
Fractional Order Systems ◽  
Resonance Behavior ◽  
Abrupt Jump ◽  
Nonlinear Control Theory ◽  
The Difference ◽  
Fractional Order Circuits ◽  
Driving Signal

The occurrence of an hysteretic loop in the frequency response of a driven nonlinear system is a phenomenon deeply investigated in nonlinear control theory. Such a phenomenon, which is linked to the multistable behavior of the system, is called jump resonance, since the magnitude of the frequency response is subjected to an abrupt jump up/down with respect to the increasing/decreasing of the frequency of the driving signal. In this paper, we aim at investigating fractional order nonlinear systems showing jump resonance, that is systems in which the order of the derivative is noninteger and their frequency response has a magnitude that is a multivalued function in a given range of frequencies. Furthermore, a strategy for designing fractional order systems showing jump resonance is presented along with the procedure to design and implement an analog circuit based on the approximation of the fractional order derivative. An extensive numerical analysis allows one to assess that the phenomenon is robust to the difference in the derivative order, enlightening the first example of a system with order lower than two which is able to demonstrate a jump resonance behavior.

Research on Integrated Diagnosis of Contact and Non-Contact Method for Analog Circuit

2012 ◽  
Vol 226-228 ◽  
pp. 1899-1905
Author(s):  
Yan Hong Hao ◽  
Jia Li Wang
Keyword(s):  
Feature Extraction ◽  
Frequency Response ◽  
Analog Circuit ◽  
Fault Coverage ◽  
Final Decision ◽  
Contact Method ◽  
High Complexity ◽  
Raw Data ◽  
Integrated Diagnosis ◽  
Complexity Of Algorithm

Traditional analog diagnoses by contact way generally get voltage, current or frequency response as their inputs. They have some inevitable drawbacks, such as the change of inputs during contacting and the inaccessibility of some necessary notes. Furthermore, contact method rarely does well in multi-faults. It can get high fault resolution or fault coverage only by high complexity of algorithm. This paper proposes a method of Integrated Diagnosis to solve the problems above. This method acquires raw data from both contact and non-contact way. It gets feature extraction and draws conclusions from the two ways respectively, and then fuses the two conclusions into a final decision. This method makes good use of information from multi-sensors. It obtains the advantages of both contact and non-contact way, but avoids the disadvantages of the two. Experiment shows its fault coverage and fault resolution both get an improvement, compared with that of other single methods. At the same time, it diagnoses multi-faults as simple and efficient as single-faults.

scholarly journals Analog pile-up circuit technique using a single capacitor for the readout of Skipper-CCD detectors

2021 ◽  
Vol 16 (11) ◽  
pp. P11012
Author(s):  
M. Sofo Haro ◽  
C. Chavez ◽  
J. Lipovetzky ◽  
F. Alcalde Bessia ◽  
G. Cancelo ◽  
...  
Keyword(s):  
Analog Circuit ◽  
Noise Sources ◽  
Pile Up ◽  
Minimum Number ◽  
Exact Counting ◽  
Pixel Value ◽  
Time Averages ◽  
Multiple Samples ◽  
Ccd Detectors ◽  
Circuit Technique

Abstract With Skipper-CCD detectors it is possible to take multiple samples of the charge packet collected on each pixel. After averaging the samples, the noise can be extremely reduced allowing the exact counting of electrons per pixel. In this work we present an analog circuit that, with a minimum number of components, applies a double slope integration (DSI) and at the same time averages the multiple samples, producing at its output the pixel value with sub-electron noise. For this purpose, we introduce the technique of using the DSI integrator capacitor to add the skipper samples. An experimental verification using discrete components is presented, together with an analysis of its noise sources and limitations. After averaging 400 samples it was possible to reach a readout noise of 0.18 e- rms/pix, comparable to other available readout systems. Due to its simplicity and significant reduction of the sampling requirements, this circuit technique is of particular interest in particle experiments and cameras with a high density of Skipper-CCDs.

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