EVALUATION OF IMPEDANCE OF CABLES IN GONIOPHOTOMETRY

2021 ◽  
Author(s):  
Pan Jiangen ◽  
Li Qian ◽  
Li Xiaoni
Keyword(s):  
Power Supply ◽  
Measurement Errors ◽  
Low Frequency ◽  
Electrical Measuring ◽  
Electrical Circuit ◽  
Electrical Measuring Instrument ◽  
Measuring Instrument ◽  
Equivalent Electrical Circuit ◽  
Electrical Circuit Model ◽  
Equivalent Electrical Circuit Model

In a goniophotometer system, it is often unavoidable to use long cables to connect power supply, electrical measuring instrument, and the device under test (DUT). The measurement errors caused by cable impedance should not be ignored. An equivalent electrical circuit model considering the cable impedance of a typical goniophotometer is established in this paper. The measurement errors caused by the cable impedance are analysed by simulation. In DC and low frequency circuits, the cable impedance is almost resistive, while the inductive impedance of cables is significant and may lead to considerable errors when frequency is above 1 kHz in the circuits. Cable solutions in goniophotometry are introduced and recommended.

Diode Parameters and Equivalent Electrical Circuit Model of n-Type Silicon/B-Doped p-Type Ultrananocrystalline Diamond Heterojunctions Manufactured Through Coaxial Arc Plasma Deposition

2020 ◽  
Vol 20 (8) ◽  
pp. 4884-4891
Author(s):  
Rawiwan Chaleawpong ◽  
Nathaporn Promros ◽  
Peerasil Charoenyuenyao ◽  
Phongsaphak Sittimart ◽  
Satoshi Takeichi ◽  
...  
Keyword(s):  
Plasma Deposition ◽  
Electrical Circuit ◽  
Circuit Model ◽  
Arc Plasma ◽  
Equivalent Electrical Circuit ◽  
Type Silicon ◽  
Ultrananocrystalline Diamond ◽  
Electrical Circuit Model ◽  
Equivalent Electrical Circuit Model ◽  
P Type

Coaxial arc plasma deposition (CAPD) was employed to manufacture n-type silicon/boron-doped p-type ultrananocrystalline diamond heterojunctions. Measurement and analysis of their dark current density-voltage curve were carried out at room temperature in order to calculate the requisite junction parameters using the Cheung and Norde approaches. For the calculation based on the Cheung approach, the series resistance (Rs), ideality factor (n) and barrier height (Φb) were 4.58 kΩ, 2.82 and 0.75 eV, respectively. The values of Rs and Φb were in agreement with those calculated using the Norde approach. Their characteristics for alternative current impedance at different frequency values were measured and analyzed as a function of the voltage (V) values ranging from 0 V to 0.5 V. Appearance of the real (Z′) and imaginary (Z″) characteristics for all V values presented single semicircles. The centers of the semicircular curves were below the Z′ axis and the diameter of the semicircles decreased with increments of the V value. The proper equivalent electrical circuit model for the manufactured heterojunction behavior was comprised of Rs combined with the parallel circuit of resistance and constant phase element.

Sheath Equivalent Electrical Circuit Model for Transient Sheath Dynamics

2004 ◽  
Vol 43 (5A) ◽  
pp. 2704-2710 ◽  
Author(s):  
Utpal Deka ◽  
Ram Prakash ◽  
Arun Sarma ◽  
Chandra Bhushan Dwivedi
Keyword(s):  
Electrical Circuit ◽  
Circuit Model ◽  
Equivalent Electrical Circuit ◽  
Electrical Circuit Model ◽  
Equivalent Electrical Circuit Model

Research of the impact of coupling between unit cells on performance of linear-to-circular polarization conversion metamaterial with half transmission and half reflection

2018 ◽  
Vol 32 (10) ◽  
pp. 1850124
Author(s):  
Mengchao Guo ◽  
Kan Zhou ◽  
Xiaokun Wang ◽  
Haiyan Zhuang ◽  
Dongming Tang ◽  
...  
Keyword(s):  
Electrical Circuit ◽  
Circuit Model ◽  
Polarization Conversion ◽  
Equivalent Electrical Circuit ◽  
Circularly Polarized ◽  
Unit Cells ◽  
Linearly Polarized ◽  
Electrical Circuit Model ◽  
Equivalent Electrical Circuit Model ◽  
The Impact

In this paper, the impact of coupling between unit cells on the performance of linear-to-circular polarization conversion metamaterial with half transmission and half reflection is analyzed by changing the distance between the unit cells. An equivalent electrical circuit model is then built to explain it based on the analysis. The simulated results show that, when the distance between the unit cells is 23 mm, this metamaterial converts half of the incident linearly-polarized wave into reflected left-hand circularly-polarized wave and converts the other half of it into transmitted left-hand circularly-polarized wave at 4.4 GHz; when the distance is 28 mm, this metamaterial reflects all of the incident linearly-polarized wave at 4.4 GHz; and when the distance is 32 mm, this metamaterial converts half of the incident linearly-polarized wave into reflected right-hand circularly-polarized wave and converts the other half of it into transmitted right-hand circularly-polarized wave at 4.4 GHz. The tunability is realized successfully. The analysis shows that the changes of coupling between unit cells lead to the changes of performance of this metamaterial. The coupling between the unit cells is then considered when building the equivalent electrical circuit model. The built equivalent electrical circuit model can be used to perfectly explain the simulated results, which confirms the validity of it. It can also give help to the design of tunable polarization conversion metamaterials.

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