scholarly journals Investigating Detectability of Infrared Radiation Based on Image Evaluation for Engine Flame

Entropy ◽  
2019 ◽  
Vol 21 (10) ◽  
pp. 946 ◽  
Author(s):  
Xia Li ◽  
Jun Wang ◽  
Meihui Li ◽  
Zhenming Peng ◽  
Xingrun Liu
Keyword(s):  
Infrared Radiation ◽  
Background Radiation ◽  
Evaluation Model ◽  
Radiation Detection ◽  
Infrared Image ◽  
Surface Radiation ◽  
Spectral Correlation ◽  
Jet Flame ◽  
Angle Of View ◽  
Application Requirements

Aiming at the application requirements of infrared detection, the influence of earth background interference on plume radiation detection is investigated and discussed in this article. The infrared image of the earth’s atmospheric background radiation is simulated by the spectral correlation based on the conversion model of the surface radiation with different bands. The infrared radiation image of the jet flame and the background is generated by overlapping the infrared radiation of the engine flame and the background radiation according to the detection angle of view. Through the image quality evaluation model, the detectability of the flame is analyzed. The simulating results show that the comprehensive statistical features such as image information entropy, variance and signal-to-clutter ratio can be used to evaluate the detectability of the engine flame.

scholarly journals Numerical Thermal Analysis and 2-D CFD Evaluation Model for An Ideal Cryogenic Regenerator

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 361 ◽  
Author(s):  
Natheer Almtireen ◽  
Jürgen J. Brandner ◽  
Jan G. Korvink
Keyword(s):  
High Reliability ◽  
Low Cost ◽  
Evaluation Model ◽  
Volumetric Flow Rate ◽  
Cooling Capacity ◽  
Heating And Cooling ◽  
The Matrix ◽  
Overall Performance ◽  
Application Requirements ◽  
Vital Element

Regenerative cryocoolers such as Stirling, Gifford–McMahon, and pulse tube cryocoolers possess great merits such as small size, low cost, high reliability, and good cooling capacity. These merits led them to meet many IR and superconducting based application requirements. The regenerator is a vital element in these closed-cycle cryocoolers, but the overall performance depends strongly on the effectiveness of the regenerator. This paper presents a one-dimensional numerical analysis for the idealized thermal equations of the matrix and the working gas inside the regenerator. The algorithm predicts the temperature profiles for the gas during the heating and cooling periods, along with the matrix nodal temperatures. It examines the effect of the regenerator’s length and diameter, the matrix’s geometric parameters, the number of heat transfer units, and the volumetric flow rate, on the performance of an ideal regenerator. This paper proposes a 2D axisymmetric CFD model to evaluate the ideal regenerator model and to validate its findings.

scholarly journals Graphene-incorporated plasmo-thermomechanical infrared radiation detection

2020 ◽  
Vol 37 (3) ◽  
pp. 774
Author(s):  
Mohammad Wahiduzzaman Khan ◽  
Qiancheng Zhao ◽  
Parinaz Sadri-Moshkenani ◽  
Md Shafiqul Islam ◽  
Ozdal Boyraz
Keyword(s):  
Infrared Radiation ◽  
Radiation Detection

scholarly journals LiteBIRD: A Satellite for the Studies of B-Mode Polarization and Inflation from Cosmic Background Radiation Detection

2019 ◽  
Vol 194 (5-6) ◽  
pp. 443-452 ◽  
Author(s):  
M. Hazumi ◽  
P. A. R. Ade ◽  
Y. Akiba ◽  
D. Alonso ◽  
K. Arnold ◽  
...  
Keyword(s):  
Background Radiation ◽  
Radiation Detection ◽  
Cosmic Background Radiation ◽  
Cosmic Background

Background Radiation: Detection, Measurement and Hazards

2017 ◽  
pp. 119-122
Author(s):  
Rajan Paudel Chhetri
Keyword(s):  
Background Radiation ◽  
Radiation Detection ◽  
Significant Risk ◽  
Alpha Particles ◽  
X Rays ◽  
Human Beings ◽  
Radiation Level ◽  
Beta Particles ◽  
Agriculture Industry ◽  
Ionizing Radiations

Radiation is a form of energy. It is of two types: non-ionizing and ionizing. Among them, ionizing radiations have hazardous health effects upon human beings. Different types of cancers may arise from the overexposure to ionizing radiations like alpha- particles, beta-particles, gamma- rays, x-rays etc. Further, ionizing radiations have very important utilities in case of paper handling and use. Radiations can be used for various beneficial purposes like medical imaging, radiation therapy, improvement of quality of agriculture, industry etc. The overall radiation from various sources on a specific location on earth's surface refers to the background radiation level of that zone. Exposure to background radiation is an inescapable feature of the environment. A portable GM counter was used to quantify the total radiation level at different places. The finding of this shows a variation of radiation level. Comparatively large values of radiation counts at high altitude and low values at river side. There is no any abnormal value of radiation counts for all sample places. So, there is, generally, no significant risk of public exposure to the background radiation for sample places.The Himalayan Physics Vol. 6 & 7, 2017 (119-122)

Impact of Background Radiation on the Long Wave Infrared Radiation Characteristics of Aircraft at High Altitude

2016 ◽  
Vol 66 (1) ◽  
pp. 51 ◽  
Author(s):  
Wei Huang ◽  
Hong-hu Ji
Keyword(s):  
Infrared Radiation ◽  
Horizontal Plane ◽  
Background Radiation ◽  
Reverse Monte Carlo ◽  
Radiance Temperature ◽  
Radiation Characteristics ◽  
Long Wave ◽  
The Impact ◽  
Long Wave Infrared ◽  
Tracing Method

<p class="maintext">Reflected background infrared radiation is an important contributor to the aircraft total infrared radiation. A reverse Monte Carlo ray tracing method to compute the infrared radiation signature of aircraft was introduced. The impact of atmospheric and ground radiation on the long wave infrared radiation signature of aircraft at the altitude of 11 km is analysed. The flight speed is Mach 0.8. The horizontal detection directions, downward detection directions and upward detection directions are considered. The results show that in the horizontal plane, the ratio of reflected background infrared radiation to self infrared radiation is about 10 per cent in summer, and 7 per cent in winter; the ratio values distributed in the front and side of the aircraft are bigger than that in the rear; and the existence of atmospheric and ground infrared radiation makes the apparent radiance temperature of the lower part of the aircraft higher than that of the upper part of the aircraft.</p><p class="maintext"><strong>Defence Science Journal, Vol. 66, No. 1, January 2016, pp. 51-56, DOI: http://dx.doi.org/10.14429/dsj.66.8090</strong></p>

Quantum dot and star like lead sulfide for infrared radiation detection

2011 ◽  
Author(s):  
Mahboubeh Dolatyari ◽  
Somayeh Miri ◽  
Hemayat Shekari ◽  
Akbar Bakhtiari ◽  
Ali Rostami
Keyword(s):  
Quantum Dot ◽  
Lead Sulfide ◽  
Infrared Radiation ◽  
Radiation Detection

Remote infrared radiation detection using piezoresistive microcantilevers

1996 ◽  
Vol 69 (20) ◽  
pp. 2986-2988 ◽  
Author(s):  
P. G. Datskos ◽  
P. I. Oden ◽  
T. Thundat ◽  
E. A. Wachter ◽  
R. J. Warmack ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Radiation Detection

Infrared radiation detection by a piezoelectric heterostructure at room temperature

2012 ◽  
Vol 9 (8-9) ◽  
pp. 1793-1796 ◽  
Author(s):  
T. Kryshtab ◽  
R. Savkina ◽  
F. Sizov ◽  
A. Smirnov ◽  
M. Kladkevich ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Room Temperature ◽  
Radiation Detection
Sign in / Sign up

Export Citation Format

Share Document