A versatile measuring system for electroacoustic transducer characteristic parameters

2015 ◽  
Author(s):  
R. J. Chi ◽  
K. J. Wang ◽  
J. J. Li ◽  
X. L. Wang ◽  
Y. Z. Liang
Keyword(s):  
Measuring System ◽  
Characteristic Parameters ◽  
Electroacoustic Transducer

Research on Computational Method of Characteristic Parameters for Measuring System Based on Quasi-Static Absolute Calibration

2017 ◽  
Vol 865 ◽  
pp. 599-604
Author(s):  
Jing Chen ◽  
De Ren Kong ◽  
Ting Wei Gu ◽  
Fei Shang
Keyword(s):  
Measurement Accuracy ◽  
Computational Method ◽  
Measuring System ◽  
Effective Bandwidth ◽  
Absolute Calibration ◽  
Characteristic Parameters ◽  
Static Calibration ◽  
Force Transfer ◽  
Working Characteristic ◽  
Flat Section

Quasi-static absolute calibration is using force with semi-sinusoidal pulse to calibrate pressure measuring system. The pulse width must be wide enough in order to guarantee the effective bandwidth of frequency spectrum be in the flat section of amplitude-frequency characteristics of the tested system. In this way, the result is similar to that from static calibration. The working characteristic parameters for measuring system which is gained from quasi-static calibration is different form static calibration in species, physical meanings and attainment methods. Therefore, the research is of great significance in forming quasi-static calibration system and improving measurement accuracy. The pilot scheme will be introduced in this essay. What is more, the calculation of working characteristic parameters for measuring system will be discussed by taking the force with specific pulse as example, including sensitivity when force transfer to pressure, linearity and repeatability which are used to evaluate the uncertainty of measurement.

scholarly journals Determination of Conditional Constants of Conductometric Sensors

2021 ◽  
Vol 57 (4) ◽  
pp. 35-42
Author(s):  
N.D. Koshel ◽  
◽  
S.A. Koshel ◽  
Keyword(s):  
Electrical Conductivity ◽  
Measuring System ◽  
Calibration Data ◽  
Platinum Electrodes ◽  
Characteristic Parameters ◽  
Special Software ◽  
Glass Tubes ◽  
Flow Through ◽  
Reference Functions

The process of the calibration of flow-through conductometric sensors of electrical conductivity and their concentration in solutions of NaOH, NaCl, Na2CO3 is investigated. Two-electrode sensors in glass tubes were used, with platinum electrodes in combination with the developed resistometer. The measuring system resisto-meter-sensor KSN-19, KSN-22, and KSN-23 operates on a pulsed alternating current with a frequency of 4 kHz. The calibration dependences of the concentration-resistance sensors in the indicated solutions were measured. Three main parameters of the sensors were determined by means of special software processing of the calibration data and their comparison with precise reference functions, namely, the “sensor constant” KS, KS1, and KS3. It is shown that all characteristic parameters of sensors depend on the chemical composition of the analyzed medium and are not constants. Theoretical substantiations of the observed regularity are given.

Siphon Flows in Stratified Coronal Loops

1994 ◽  
Vol 144 ◽  
pp. 185-187
Author(s):  
S. Orlando ◽  
G. Peres ◽  
S. Serio
Keyword(s):  
Heat Flux ◽  
Scaling Laws ◽  
Flow Model ◽  
Supersonic Flows ◽  
Coronal Loops ◽  
Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

Observations on Potential Differences of the Human Stomach by a New Electrode and Measuring System

1953 ◽  
Vol 25 (2) ◽  
pp. 273-289 ◽  
Author(s):  
P.W. Ingram ◽  
D.L. Richards
Keyword(s):  
Human Stomach ◽  
Measuring System

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

Information and measuring system based on the device «Polyreotest PRT-2» for wheat hardness control

2020 ◽  
Vol 29 (8) ◽  
pp. 57-61
Author(s):  
V.Y. Chernykh ◽  
◽  
E.V. Karpushina ◽  
N. Yu. Bykova ◽  
A.S. Maksimov ◽  
...  
Keyword(s):  
Measuring System

A new method of fluxgate signal extraction

2017 ◽  
Vol 2017 (45) ◽  
pp. 83-89
Author(s):  
A.A. Marusenkov ◽  
Keyword(s):  
High Frequency ◽  
Second Harmonic ◽  
Excitation Frequency ◽  
Low Noise ◽  
Measuring System ◽  
Signal Extraction ◽  
Fluxgate Magnetometer ◽  
New Approach ◽  
Average Value ◽  
The Time Domain

Using dedicated high-frequency measuring system the distribution of the Barkhausen jumps intensity along a reversal magnetization cycle was investigated for low noise fluxgate sensors of various core shapes. It is shown that Barkhausen (reversal magnetization) noise intensity is strongly inhomogeneous during an excitation cycle. In the traditional second harmonic fluxgate magnetometers the signals are extracted in the frequency domain, as a result, some average value of reversal magnetization noises is contributed to the output signals. In order to fit better the noise shape and minimize its transfer to the magnetometer output the new approach for demodulating signals of these sensors is proposed. The new demodulating method is based on information extraction in the time domain taking into account the statistical properties of cyclic reversal magnetization noises. This approach yields considerable reduction of the fluxgate magnetometer noise in comparison with demodulation of the signal filtered at the second harmonic of the excitation frequency.

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