Research on Calibration of Power IGBT Model Test Equipment

2014 ◽  
Vol 644-650 ◽  
pp. 3936-3939
Author(s):  
Chong Liu ◽  
Bo Han Zhong ◽  
Yu Feng Zhang ◽  
Jin Song Kan
Keyword(s):  
Model Test ◽  
Pulse Current ◽  
Calibration Method ◽  
Rogowski Coil ◽  
Test Equipment ◽  
Static Test ◽  
Module Test ◽  
Igbt Module ◽  
Calibration Device ◽  
Data Acquisition Unit

Power IGBT module and its dynamic and static test equipments are widely used. How to calibrate the IGBT module test equipments is in great demand. Based on the investigation of domestic and foreign method for power IGBT module test equipment calibration, the calibration method of the important parameters, pulse current, for this equipment were researched in this passage. the Rogowski coil and the data acquisition unit were used to realize the pulse current amplitude (up to 5000A) calibration. Calibration device for power IGBT module test equipment was setup, calibration specification for power IGBT module test equipment was authorized to ensure the values of power IGBT module test equipment.

Fluctuating Shear Stress Calibration Method Using a Channel Flow

2010 ◽  
Author(s):  
Daniel C. Cole ◽  
Michael L. Jonson ◽  
Kendra V. Sharp
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Flow Field ◽  
Calibration Method ◽  
Direct Shear ◽  
Radiated Noise ◽  
Calibration Device ◽  
Wall Shear ◽  
Oscillating Plate ◽  
Temporal Field

Fluctuating wall shear stress causes vibration and radiated noise from a structure. In the past wall shear stress has been measured indirectly using hot wires and hot films. Recently direct shear sensors have been developed. In this paper a calibration device consisting of a 305 mm × 60 mm × 5 mm channel filled with glycerin is used to calibrate a direct shear stress sensor with amplitudes up to 10 Pa of shear stress over a frequency range from 10 Hz to 1 kHz. The analytically known flow field caused by an oscillating plate 5 mm from the sensor is verified using laser Doppler velocimetry (LDV). The flow field is derived using a frequency-wavenumber approach thereby allowing for a known spatial and temporal field to be generated by specifying a derived plate vibration.

A New Linearly Polarized Microwave Radiometer Calibration Source

2012 ◽  
Vol 500 ◽  
pp. 341-347
Author(s):  
Xin Biao Wang ◽  
Chang Zeng ◽  
Jing Li ◽  
Jing Shan Jiang
Keyword(s):  
Real Time ◽  
Microwave Radiometer ◽  
Noise Temperature ◽  
Calibration Method ◽  
Calibration Source ◽  
Radiometer Calibration ◽  
Time Calibration ◽  
Linearly Polarized ◽  
Calibration Device

This paper introduces a calibration device for microwave (millimeter and submillimeter) radiometer. The device can provide the microwave radiometer continuously variable linearly polarized noise temperature. The paper also introduces a real-time calibration method to achieve the microwave radiometer calibration, and the test of microwave radiometer sensitivity and linearity.

Model Test Research on the Pile Stress by Pseudo-Static Test of Pier-Foundation-Structure System

2011 ◽  
Vol 383-390 ◽  
pp. 6641-6645
Author(s):  
Ming Bo Ding ◽  
Xing Chong Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Test ◽  
Element Model ◽  
Static Test ◽  
Structure System ◽  
Foundation Structure ◽  
Depth Curve

This paper mostly studied on the pile stress in the loess foundation when the pile and the soil are interacting by pseudo-static test of piers and piles in the remolded loess foundation indoor. We get the stress-depth curve of pile body. We get its finite element model by ANASYS and analyze the change of pile body stress.

A combined fire smoke and lung model test equipment

Fire Toxicity ◽  
2010 ◽  
pp. 366-382
Author(s):  
T. Hertzberg ◽  
P. Blomqvist ◽  
R. Nosratabadi
Keyword(s):  
Model Test ◽  
Lung Model ◽  
Test Equipment ◽  
Fire Smoke

scholarly journals A Fast Calibration Method for Photonic Mixer Device Solid-State Array Lidars

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 822 ◽  
Author(s):  
Yayu Zhai ◽  
Ping Song ◽  
Xiaoxiao Chen
Keyword(s):  
Solid State ◽  
High Reliability ◽  
Calibration Method ◽  
Black Box ◽  
Oxide Semiconductor ◽  
Lens Distortion ◽  
Research Attention ◽  
Adaptive Interpolation ◽  
Calibration Methods ◽  
Calibration Device

The photonic mixer device (PMD) solid-state array lidar, as a three-dimensional imaging technology, has attracted research attention in recent years because of its low cost, high frame rate, and high reliability. To address the disadvantages of traditional PMD solid-state array lidar calibration methods, including low calibration efficiency and accuracy, and serious human error factors, this paper first proposes a calibration method for an array complementary metal–oxide–semiconductor photodetector using a black-box calibration device and an electrical analog delay method; it then proposes a modular lens distortion correction method based on checkerboard calibration and pixel point adaptive interpolation optimization. Specifically, the ranging error source is analyzed based on the PMD solid-state array lidar imaging mechanism; the black-box calibration device is specifically designed for the calibration requirements of anti-ambient light and an echo reflection route; a dynamic distance simulation system integrating the laser emission unit, laser receiving unit, and delay control unit is designed to calibrate the photodetector echo demodulation; the checkerboard calibration method is used to correct external lens distortion in grayscale mode; and the pixel adaptive interpolation strategy is used to reduce distortion of distance images. Through analysis of the calibration process and results, the proposed method effectively reduces the calibration scene requirements and human factors, meets the needs of different users of the lens, and improves both calibration efficiency and measurement accuracy.

Electrical Performance Results Comparison of Photovoltaic Module between Two ISO 17025 Certified Laboratories

2014 ◽  
Vol 672-674 ◽  
pp. 48-53
Author(s):  
Hai Tao Liu ◽  
Xin Jing Zou ◽  
Yong Hui Zhai
Keyword(s):  
Calibration Method ◽  
Control Measures ◽  
Electrical Performance ◽  
Internal Quality ◽  
Photovoltaic Module ◽  
Laboratory System ◽  
Iso 17025 ◽  
Uncertainty Sources ◽  
Spatial Uniformity ◽  
Data Acquisition Unit

The goal of I-V characteristic measurement of photovoltaic (PV) module is to reduce uncertainty not only for PV laboratories but also for manufacturers. This paper presents the results comparison and data analysis between two PV laboratories. Even though both laboratories have obtained the ISO 17025 certificate, the I-V results show inevitable deviation. The cause of deviation depends on photovoltaic scale traceability of laboratory, system bias, internal quality control measures and other uncertainty sources. The analysis also shows that the PV scale traceability is the most important factor to reduce result deviation among laboratories and measurement uncertainty. The various contributions to the result deviation are critically illustrated for different traceability chains. Besides, the calibration method of reference photovoltaic devices (reference cell or module), spatial uniformity of irradiance and I-V data acquisition unit should be paid more attention as well.

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