scholarly journals Designing Optically & Utilization of Thermopile Chip with Resonant Cavity Absorber Structure as IR Absorber

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 302
Author(s):  
Haigang Hou ◽  
Jian Yang ◽  
Guiwu Liu ◽  
Junlin Liu ◽  
Mudassar Abbas ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Duty Cycle ◽  
Dielectric Layer ◽  
Metal Layer ◽  
Optical Design ◽  
Resonant Cavity ◽  
Cavity Structure ◽  
Calculation Results ◽  
Absorber Structure ◽  
Suspension Structure

This paper presents a novel thermopile chip in which the resonant cavity structure was fully utilized as an absorber by an optical design. The resonant cavity absorber structure was designed using Al as anthe bottom reflective metal layer, air as the intermediate dielectric layer, and SiO2/TiN/Si3N4 sandwich layers as the top absorption layer, while the bottom reflective metal (Al) was deposited on the cold junctions of the thermopile. The simulation and calculation results show that the thermopile chip with resonant cavity absorber structure not only has great infrared absorption in the wide infrared absorption range but also can effectively prevent the cold junctions from absorbing infrared radiation and inhibit the rise of temperature. As a result, the temperature difference between the hot junctions and the cold junctions is increased, and the responsivity of the thermopile chip is further improved. Moreover, the duty cycle of the thermopile chip is greatly improved due to the double-layer suspension structure. Compared with the traditional thermopile chip structure, the sizes of the thermopile chip with the resonant cavity absorber structure can be further reduced while maintaining responsivity and specific detectivity.

A Novel Miniaturized Vivaldi Antenna Using Tapered Slot Edge With Resonant Cavity Structure for Ultrawideband Applications

2016 ◽  
Vol 15 ◽  
pp. 1881-1884 ◽  
Author(s):  
Yushun Liu ◽  
Wenjun Zhou ◽  
Shijie Yang ◽  
Weihao Li ◽  
Pengfei Li ◽  
...  
Keyword(s):  
Resonant Cavity ◽  
Cavity Structure ◽  
Vivaldi Antenna

Discontinuous Space Vector Modulation Strategy for Three-Level Neutral Point Clamped Inverter

2015 ◽  
Vol 781 ◽  
pp. 435-438
Author(s):  
Kanyarat Ek-Iam ◽  
Yuttana Kumsuwan
Keyword(s):  
Duty Cycle ◽  
Mathematical Analysis ◽  
Switching Time ◽  
Neutral Point ◽  
Modulation Scheme ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Switching Losses ◽  
Calculation Results ◽  
Vector Modulation

This paper presents a discontinuous space vector modulation (SVM) strategy for a three-level neutral point clamped (3L-NPC) inverter. The proposed scheme, calculation switching time of the 3L-NPC inverter is fully described. A mathematical analysis of the duty cycle is determined by utilizing the calculated switching time method. The main advantages of the proposed method are minimization of the number of commutations of switches and reduction of the switching losses. Simulated and calculation results are presented to verify the validity and effectiveness of the proposed modulation scheme.

scholarly journals High Sensitivity And Ultra-High Quality Factor For An All-Optical Temperature Sensor Based On Photonic Crystal Technology

2021 ◽  
Author(s):  
Kouddad Elhachemi ◽  
Naoum Rafah ◽  
Dekkiche Leila
Keyword(s):  
Photonic Crystal ◽  
Quality Factor ◽  
Temperature Sensor ◽  
Resonant Cavity ◽  
Fdtd Method ◽  
Transmission Efficiency ◽  
High Quality Factor ◽  
High Quality ◽  
Compact Size ◽  
Cavity Structure

Abstract In our work, we propose a novel temperature sensor design based on a two-dimensional (2D) photonic crystal resonant cavity structure designed to detect and monitor temperature under very harsh environmental conditions from 0 °C to 500 ºC. The sensitivity of the proposed structure is 109.8 pm/ºC, an ultra-high quality factor, high transmission efficiency and ultra-compact size. The characteristics of the proposed sensor under different temperatures are simulated using the Plane Wave Expansion (PWE) method and Finite Difference Time Domain (FDTD) method to calculate, respectively, the Photonic Band Gap (PBG) and transmission efficiency. The results obtained show that the wavelength of the resonant cavity increases linearly with increasing temperature. Our sensor is suitable for applications based on nanotechnology.

Coherent control of thermal emission from SiC due to coupled resonant cavity structure

2008 ◽  
Author(s):  
Nir Dahan ◽  
Avi Niv ◽  
Gabriel Biener ◽  
Yuri Gorodetski ◽  
Vladimir Kleiner ◽  
...  
Keyword(s):  
Coherent Control ◽  
Thermal Emission ◽  
Resonant Cavity ◽  
Cavity Structure

Experimental near infrared absorption enhancement of graphene layers in an optical resonant cavity

2019 ◽  
Vol 30 (44) ◽  
pp. 445201 ◽  
Author(s):  
Abedin Nematpour ◽  
Nicola Lisi ◽  
Angela Piegari ◽  
Laura Lancellotti ◽  
Guohang Hu ◽  
...  
Keyword(s):  
Infrared Absorption ◽  
Near Infrared ◽  
Resonant Cavity ◽  
Absorption Enhancement ◽  
Graphene Layers

Resonant‐cavity GaAs/InGaAs/AlAs photodiodes with a periodic absorber structure

1993 ◽  
Vol 63 (2) ◽  
pp. 141-143 ◽  
Author(s):  
F. Y. Huang ◽  
A. Salvador ◽  
X. Gui ◽  
N. Teraguchi ◽  
H. Morkoç
Keyword(s):  
Resonant Cavity ◽  
Absorber Structure

Design and Study on Intrinsically Safe Circuit of Portable Infrared Methane Alarming Device

2011 ◽  
Vol 328-330 ◽  
pp. 1930-1934
Author(s):  
Xiao Hui Wang ◽  
Jing Yu Wang ◽  
Jing Lin Zhang ◽  
Ting Liang
Keyword(s):  
Infrared Absorption ◽  
Coal Mine ◽  
Detection Accuracy ◽  
Calculation Results ◽  
Gas Environment ◽  
Intrinsic Safety

Based on the theory of infrared absorption, a new kind of portable methane alarming device has been developed with the advantages that cost-low, maintenance-free, miniaturization, and integration. Intrinsically safe circuit is absolutely necessary, because the device is installed in the explosive gas environment. To improve the detection accuracy and increase the safety of the coal mine, the device’s intrinsically safe circuit has been designed. All parameters of the circuit are designed in accordance with IEC 60079-0-2007 Explosive atmospheres-Part 0: Equipment - General requirements and IEC 60079-11-2006 Explosive atmospheres-Part 11: Equipment protection by intrinsic safety “i”. The related analyses and calculation results show that this intrinsically safe circuit is workable and reliable.

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