Optical design of long transmission type ultraviolet detection system

2019 ◽  
Author(s):  
Xuewu Fan ◽  
Lei Wang ◽  
Dongwei Ni ◽  
Yuming Wang
Keyword(s):  
Detection System ◽  
Optical Design ◽  
Ultraviolet Detection

Optical design of MWIR detection system for near-space infrared detecting

2015 ◽  
Author(s):  
Pei-pei Yan ◽  
Kai Liu ◽  
Gang Li ◽  
Qiusha Shan ◽  
Jing Duan ◽  
...  
Keyword(s):  
Detection System ◽  
Optical Design ◽  
Near Space

Liquid Chromatography of Polycyclic Aromatic Hydrocarbons

1972 ◽  
Vol 55 (4) ◽  
pp. 757-761
Author(s):  
N Fred Ives ◽  
L Giuffrida
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Liquid Chromatography ◽  
Cellulose Acetate ◽  
Aromatic Hydrocarbons ◽  
Continuous Monitoring ◽  
Detection System ◽  
Ultraviolet Detection ◽  
Polycyclic Aromatic ◽  
Analytical Liquid Chromatography

Abstract The liquid chromatography of 18 polycyclic aromatic hydrocarbons was investigated by using a continuous monitoring ultraviolet detection system. Two column materials, Durapak OPN and 40% cellulose acetate, were compared for orders of elution and resolution. Neither system resolves all the compounds tested but the use of more than one system increases the number which may be resolved. This investigation demonstrates the potential of analytical liquid chromatography for the resolution and analysis of such compounds.

scholarly journals Infrared Optical Observability of an Earth Entry Orbital Test Vehicle Using Ground‐Based Remote Sensors

2019 ◽  
Vol 11 (20) ◽  
pp. 2404 ◽  
Author(s):  
Niu ◽  
Meng ◽  
He ◽  
Dong
Keyword(s):  
Detection System ◽  
Optical Design ◽  
Spectral Band ◽  
Radiative Properties ◽  
Design Parameters ◽  
Reacting Flow ◽  
Test Vehicle ◽  
Detection Range ◽  
Order Of Magnitude ◽  
The Difference

Optical design parameters for a ground-based infrared sensor rely strongly on the target’s optical radiation properties. Infrared (IR) optical observability and imaging simulations of an Earth entry vehicle were evaluated using a comprehensive numerical model. Based on a ground-based IR detection system, this model considered many physical mechanisms including thermochemical nonequilibrium reacting flow, radiative properties, optical propagation, detection range, atmospheric transmittance, and imaging processes. An orbital test vehicle (OTV) was selected as the research object for analysis of its observability using a ground-based infrared system. IR radiance contours, maximum detecting range (MDR), and thermal infrared (TIR) pixel arrangement were modeled. The results show that the distribution of IR radiance is strongly dependent on the angle of observation and the spectral band. Several special phenomena, including a strong receiving region (SRR), a characteristic attitude, a blind zone, and an equivalent zone, are all found in the varying altitude MDR distributions of mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) irradiances. In addition, the possible increase in detectivity can greatly improve the MDR at high altitudes, especially for the backward and forward views. The difference in the peak radiance of the LWIR images is within one order of magnitude, but the difference in that of the MWIR images varies greatly. Analyses and results indicate that this model can provide guidance in the design of remote ground-based detection systems.

Electron optical design of an EFTEM concerning optimum selection of imaging parameters for different sizes of detection systems

1995 ◽  
Vol 53 ◽  
pp. 308-309
Author(s):  
G. Benner ◽  
W. Probst ◽  
R. Rilk
Keyword(s):  
Detection System ◽  
Photographic Plate ◽  
Optical Design ◽  
Ccd Camera ◽  
Energy Window ◽  
Acceptance Angle ◽  
Detection Systems ◽  
Energy Filtering ◽  
Transmission Electron ◽  
Specimen Area

The amount of information which can be gained about an object is considerably improved by the incorporation of an imaging energy filter in a TEM. Besides the conventional modes of operation elastic brightfield (EBF) and darkfield (EDF) imaging or diffraction are provided by an Energy Filtering Transmission Electron Microscope (EFTEM) as well as Electron Spectroscopic Imaging (ESI) or Electron Energy Loss Spectroscopy (EELS). Thus, the demands for carefully designed highly flexible electron optics are much more sophisticated as compared to a CTEM.One of the most important parameters for elastic imaging and ESI is the width of the energy window, which can be selected by a slit aperture of adjustable width according to the particular needs. This energy window defines the size of the transferable specimen area or diffraction pattern, respectively, as well as the acceptance angle of the spectrometer. In order to meet the optimum parameters concerning the energy window and the size of the detection system (e.g. photographic plate, image plate, Slow Scan CCD camera (SSCCD), TV camera, electron detector, etc.) the magnifications of the pre- and of the post-spectrometer projector lens systems has to be independently adjustable.

Corona Discharge Detection System Based on Ultraviolet Sensor and Optical Lens

2019 ◽  
Vol 14 (12) ◽  
pp. 1686-1692
Author(s):  
Li Luo ◽  
Qing Yang ◽  
Jin-Long Gong ◽  
Yi-Fan Wang
Keyword(s):  
Corona Discharge ◽  
Detection Method ◽  
Detection System ◽  
Ultraviolet Rays ◽  
Detection Distance ◽  
External Interference ◽  
Optical Lens ◽  
Ultraviolet Detection ◽  
Research Results ◽  
Ultraviolet Sensor

Ultraviolet radiation produced by corona discharge can be used for discharge diagnosis, but the ultraviolet imager is expensive and the ultraviolet signal is susceptible to external interference during the day, so it can not accurately identify the occurrence of corona discharge. In this paper, an optical lens is designed to collect ultraviolet signal. In this paper, a corona detection method based on ultraviolet sensor and optical lens was proposed. The design of optical lens to concentrate the ultraviolet signal so as to suppress external interference was presented. By carrying out insulator corona discharge experiments, the feasibility of the proposed method was studied. Finally, a comparison and verification was made with the combination of corona discharge images collected by UV imager. Research results by this paper indicate that, when the detection distance is smaller than 5 m, and the power supply is about 700 V, the proposed corona detection method can effectively collect the ultraviolet rays generated by corona discharge, thus realizing the feasible recognition of corona discharge. Moreover, this method can feasibly reflect the changing of UV intensity with applied voltage and detection distance. The research results can provide important reference for the development and calibration of ultraviolet detection equipment.

Research on sapphire-based optical fiber deep ultraviolet detection system working at high temperatures

2019 ◽  
Vol 47 ◽  
pp. 88-92 ◽  
Author(s):  
Zhiyuan Zheng ◽  
Xinglin Tong ◽  
Huijuan Wang ◽  
Cui Zhang ◽  
Chengwei Deng ◽  
...  
Keyword(s):  
Optical Fiber ◽  
High Temperatures ◽  
Detection System ◽  
Ultraviolet Detection ◽  
Deep Ultraviolet
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