An improved lead compensation technique for three-wire resistance temperature detectors

1999 ◽  
Vol 48 (5) ◽  
pp. 903-905 ◽  
Author(s):  
S. Pradhan ◽  
S. Sen
Keyword(s):  
Compensation Technique ◽  
Wire Resistance

scholarly journals Lead-Wire-Resistance Compensation Technique Using a Single Zener Diode for Two-Wire Resistance Temperature Detectors (RTDs)

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2742
Author(s):  
Wei Li ◽  
Shusheng Xiong ◽  
Xiaojun Zhou
Keyword(s):  
Measurement Error ◽  
Measuring Error ◽  
Lead Wire ◽  
Remote Measurement ◽  
Zener Diode ◽  
Resistance Temperature Detector ◽  
Sensor Resistance ◽  
Temperature Detector ◽  
Compensation Technique ◽  
Wire Resistance

In remote measurement systems, the lead wire resistance of the resistance sensor will produce a large measurement error. In order to ensure the accuracy of remote measurement, a novel lead-wire-resistance compensation technique is proposed, which is suitable for a two-wire resistance temperature detector. By connecting a zener diode in parallel with the resistance temperature detector (RTD) and an interface circuit specially designed for it, the lead-wire-resistance value can be accurately measured by virtue of the constant voltage characteristic of the zener diode when reverse breakdown occurs, and compensation can thereby be made when calculating the resistance of RTD. Through simulation verification and practical circuit testing, when the sensor resistance is in 848–2120 Ω scope and the lead wire resistance is less than 50 Ω, the proposed technology can ensure the measuring error of the sensor resistance within ±1 Ω and the temperature measurement error within ±0.3 °C for RTDs performing 1000 Ω at 0 °C. Therefore, this method is able to accurately compensate the measurement error caused by the lead wire resistance in two-wire RTDsand is suitable for most applications.

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays

2011 ◽  
Vol 57 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Mariusz Zamłyński ◽  
Piotr Słobodzian
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Planar Antenna ◽  
Sidelobe Level ◽  
Edge Diffraction ◽  
Narrow Angle ◽  
Compensation Technique ◽  
Diffraction Effects ◽  
Linear Antenna Arrays

Influence of the Aperture Edge Diffraction Effects on the Mutual Coupling Compensation Technique in Small Planar Antenna Arrays In this paper the quality of a technique to compensate for mutual coupling (and other phenomena) in small linear antenna arrays is investigated. The technique consists in calculation of a coupling matrix, which is than used to determine corrected antenna array excitation coefficients. Although the technique is known for more than 20 years, there is still very little information about how different phenomena existing in a real antenna arrays influence its performance. In this paper two models of antenna arrays are used. In the first model the effect of mutual coupling is separated from the aperture edge diffraction. In the second model antenna both mutual coupling and aperture edge diffraction effects are included. It is shown that mutual coupling itself can be compensated very well and an ultralow sidelobe level (i.e. -50 dB) could be achieved in practice. In the presence of diffraction effects -46.3 dB sidelobe level has been attained, but radiation pattern can be controled only in narrow angle range (i.e. up to ±60°).

An instrument for the measurement of colour and turbidity in natural waters

1998 ◽  
Vol 37 (12) ◽  
pp. 263-267 ◽  
Author(s):  
Henry O. Edwards
Keyword(s):  
Water Treatment ◽  
Natural Waters ◽  
Beam Intensity ◽  
Compensation Technique

The development of a sensor to measure colour and turbidity of natural waters is described. Filtration of the water is not required, so maintenance intervals and costs will be reduced. A four-beam intensity compensation technique is used for robust measurement and resistance to fouling. Results of the operation of a prototype at a water treatment works are presented.

Recent Progress on Nonlinear Compensation Technique in Digital Coherent Receiver

2010 ◽  
Author(s):  
Takeshi Hoshida ◽  
Takahito Tanimura ◽  
Shoichiro Oda ◽  
Toshiki Tanaka ◽  
Hisao Nakashima ◽  
...  
Keyword(s):  
Recent Progress ◽  
Compensation Technique ◽  
Nonlinear Compensation ◽  
Coherent Receiver
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