scholarly journals An automated rotor time-constant measurement system for indirect field-oriented drives

1988 ◽  
Vol 24 (1) ◽  
pp. 151-159 ◽  
Author(s):  
C. Wang ◽  
D.W. Novotny ◽  
T.A. Lipo
Keyword(s):  
Time Constant ◽  
Measurement System ◽  
Constant Measurement

scholarly journals Per-Pixel Time Constant Measurement of Bolometer Cameras

2020 ◽  
Vol 69 (10) ◽  
pp. 7725-7739
Author(s):  
Dennis L. Waldron ◽  
Dieter J. Lohrmann
Keyword(s):  
Time Constant ◽  
Constant Measurement

Measurement on the Dielectric Constant of Grass with Rectangular Waveguide at C Band

2011 ◽  
Vol 130-134 ◽  
pp. 2138-2142 ◽  
Author(s):  
Chun Lin Xian ◽  
Yan Chen ◽  
Ling Tong ◽  
Ming Quan Jia
Keyword(s):  
Dielectric Constant ◽  
Measurement Error ◽  
Moisture Content ◽  
Measurement System ◽  
Rectangular Waveguide ◽  
Microwave Measurement ◽  
Error Range ◽  
Constant Measurement ◽  
Standard Block ◽  
Dielectric Constant Measurement

This paper was developed by microwave measurement on the vegetation dielectric constant through using the rectangular-waveguide at C Band. The measurement system and the method of the measurement will be introduced in detail. We have a standard block of known dielectric constant measurement, and then evaluate the error range. The system of measurement error range is ± 5%.At last, the result of this experiment showed that different density corresponds to different dielectric constant in the case of certain moisture content, and the dielectric constant increases with the density.

Application of fiber laser in time constant measurement of thin wire thermal resistor

2016 ◽  
Author(s):  
Junwei Zhao ◽  
Shuanglian Feng ◽  
Zhigang Zhang ◽  
Xiwen Qiang ◽  
Fei Zong ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Time Constant ◽  
Thin Wire ◽  
Thermal Resistor ◽  
Constant Measurement

scholarly journals A Measurement System for Time Constant of Thermocouple Sensor Based on High Temperature Furnace

2018 ◽  
Vol 8 (12) ◽  
pp. 2585 ◽  
Author(s):  
Yanfeng Li ◽  
Zhijie Zhang ◽  
Xiaojian Hao ◽  
Wuliang Yin
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
High Temperature ◽  
Temperature Measurement ◽  
Time Constant ◽  
Dynamic Characteristics ◽  
Measurement System ◽  
Dynamic Temperature ◽  
High Temperature Furnace ◽  
Temperature Furnace

In dynamic temperature measurement, thermocouple sensors are widely used, and their dynamic characteristics directly affect the accuracy of the test results. So before applying thermocouple sensors to dynamic temperature measurement, their dynamic characteristics should be obtained, and their dynamic performance parameters should be analyzed. The time constant is the most important dynamic parameter, which reflects the response speed of a thermocouple sensor. Therefore, it is necessary to measure the time constant. The time constant is closely related to the heat transfer mode, so the heat transfer environment of the time constant measurement system should be similar to the application environment of thermocouple sensor. When using the thermocouple to measure the temperature in various kilns, the heat transfer is mainly through the radiative mode, and existing equipment, such as constant temperature water/oil tank, shock wave tube and other devices, cannot be used to measure the time constant to reflect scenarios in actual measurement applications. Therefore, this paper proposed a new method to measure the time constant of the thermocouple by improved high temperature furnace. In the system, the high temperature furnace was used to generate the stable temperature field, and the fast feed device was used to insert the thermocouple into the high temperature furnace and generates the ramp temperature excitation. The temperature can reach 1500 °C in the furnace, and the temperature error in uniform temperature field is ±1 °C. Finally, the time constant of a K-type thermocouple was measured, and the uncertainty of the measurement result was analyzed.

Time constant measurement in technical superconductors

Cryogenics ◽  
1998 ◽  
Vol 38 (10) ◽  
pp. 1017-1029 ◽  
Author(s):  
Ludovit Krempasky ◽  
Curt Schmidt
Keyword(s):  
Time Constant ◽  
Constant Measurement
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