Exploiting spatio-spectral aberrations for rapid synchrotron infrared imaging

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Vijayakumar Anand ◽  
Soon Hock Ng ◽  
Tomas Katkus ◽  
Jovan Maksimovic ◽  
Annaleise R Klein ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Narrow Band ◽  
Single Point ◽  
Mapping Method ◽  
Rapid Imaging ◽  
Sample Plane ◽  
Point Mapping ◽  
Infrared Microspectroscopy ◽  
Imaging Detector ◽  
Ftir Spectrometer

The Infrared Microspectroscopy Beamline at the Australian Synchrotron is equipped with a Fourier transform infrared (FTIR) spectrometer, which is coupled with an infrared (IR) microscope and a choice of two detectors: a single-point narrow-band mercury cadmium telluride (MCT) detector and a 64 × 64 multi-pixel focal plane array (FPA) imaging detector. A scanning-based point-by-point mapping method is commonly used with a tightly focused synchrotron IR beam at the sample plane, using an MCT detector and a matching 36× IR reflecting objective and condenser (NA = 0.5), which is time consuming. In this study, the beam size at the sample plane was increased using a 15× objective and the spatio-spectral aberrations were investigated. A correlation-based semi-synthetic computational optical approach was applied to assess the possibilities of exploiting the aberrations to perform rapid imaging rather than a mapping approach.

scholarly journals Generating single metalloprotein crystals in well-defined redox states: electrochemical control combined with infrared imaging of a NiFe hydrogenase crystal

2017 ◽  
Vol 53 (43) ◽  
pp. 5858-5861 ◽  
Author(s):  
P. A. Ash ◽  
S. B. Carr ◽  
H. A. Reeve ◽  
A. Skorupskaitė ◽  
J. S. Rowbotham ◽  
...  
Keyword(s):  
Redox State ◽  
Infrared Imaging ◽  
Redox States ◽  
Infrared Microspectroscopy ◽  
Electrochemical Control

We manipulate and verify the redox state of single metalloprotein crystals by combining electrochemical control with synchrotron infrared microspectroscopy.

Optical readout uncooled infrared imaging detector using knife-edge filter operation

2007 ◽  
Vol 3 (2) ◽  
pp. 119-122 ◽  
Author(s):  
Q. Zhang ◽  
Z. Miao ◽  
Z. Guo ◽  
F. Dong ◽  
Z. Xiong ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Knife Edge ◽  
Optical Readout ◽  
Edge Filter ◽  
Imaging Detector ◽  
Filter Operation ◽  
Uncooled Infrared Imaging

Urban Road Materials Identification using Narrow Near Infrared Vision System

2017 ◽  
Vol 7 (3) ◽  
pp. 1171
Author(s):  
Heru Purnomo Ipung ◽  
Handayani Tjandrasa
Keyword(s):  
Near Infrared ◽  
Infrared Imaging ◽  
Narrow Band ◽  
Vision System ◽  
Optical Filter ◽  
Urban Road ◽  
Infrared Spectral ◽  
Road Materials ◽  
Spectral Patterns ◽  
Infrared Vision

<p>An urban road materials vision system using narrow band near infrared imaging indexes were proposed. This proposed imaging indexes were enhancement for previous work on autonomous multispectral road sensing method. Each urban road material has different near infrared spectral patterns which is as the base of its spectral identification. The new proposed imaging indexes, which using similar formula of NDVI, was normalized with narrow band near infrared spectrum range of 720nm to 1000nm of wavelength, were used to identify concretes, aggregates/sands/rocks, clay, natural dry fibers and bitumen/asphalt that make up most of urban road materials. This paper proposes imaging indexes evaluation from experiment results to identify those urban road materials. There were seven narrow band optical filter sets with the center spectrum at 710nm, 730nm, 750nm, 800nm, 870nm, 905nm and 970nm. Normalization band used was 720nm using high pass optical filter. The proposed multi-spectral imaging indexes were able to show the potential to classify the selected urban road materials, another approach may need to clearly distinguish between concrete and aggregates. The comparison to the previous imaging indexes (NDVI, NDGR, NDBR) were presented that used for urban road materials identification.</p>

The Absorptance of Infrared Radiation by Methane at Elevated Temperatures

1996 ◽  
Vol 118 (4) ◽  
pp. 918-923 ◽  
Author(s):  
S. P. Fuss ◽  
O. A. Ezekoye ◽  
M. J. Hall
Keyword(s):  
Large Scale ◽  
Elevated Temperatures ◽  
Narrow Band ◽  
Line Strength ◽  
Model Parameters ◽  
Band Model ◽  
Gas Cell ◽  
Hydrocarbon Gases ◽  
Ftir Spectrometer ◽  
Path Lengths

In large-scale fires and flames, radiative transport can be an important factor determining the rate of fuel volatilization and flame spread in condensed fuels, and in general can affect the amount of soot that is produced by the flame. The radiant flux can be significantly attenuated by core hydrocarbon gases that have absorption features in the infrared. The spectral absorptance of the υ3 (centered at approximately 3020 cm−l) and υ4 (centered at approximately 1306 cm−l) fundamental bands of methane were measured at elevated temperatures. The measurements were made using a FTIR spectrometer coupled to a gas cell that was maintained at a constant temperature in a furnace. The partial pressure of the methane was varied between 5 and 95 percent, yielding pressure path lengths between 1.14 and 21.72 atm-cm. The total pressure was maintained at 1 atm. Measurements were made at temperatures between 296 and 900 K. The effect of spectral resolution on the measurements and derived parameters was examined. Spectral resolutions between 4 and 32 cm−1 were used. The spectral mean parameters of line strength and line shape were determined for the Elsasser narrow band radiation model using the data taken at a resolution of 4 cm−1. The band model parameters were incorporated into RADCAL, a narrow band model used to predict spectral intensity and transmittance. The results are compared with lower resolution predictions and experimental spectral transmittance data. Tabulated narrow band parameters are available on the Internet (WWW) at URL http://www.me.utexas.edu/~combust/students/paul/research.

Real-Time Infrared Image Non-Uniformity Correction Based on FPGA

2014 ◽  
Vol 971-973 ◽  
pp. 1696-1699
Author(s):  
Jia Ying Li ◽  
Yun Chen Jiang ◽  
Lei Ren
Keyword(s):  
Real Time ◽  
Infrared Imaging ◽  
Single Point ◽  
Infrared Image ◽  
High Sensitivity ◽  
Correction Method ◽  
External Control ◽  
Detection Capability ◽  
Imaging Technology ◽  
Key Technology

IRFPA is the main direction of infrared imaging technology at present. It has high sensitivity and detection capability, but it also has disadvantages such as bad non-uniformity. Non-uniformity correction is a key technology in the application of IRFPA. As an applicable and real time non-uniformity correction method, the two-point correction algorithmic and single-point correction algorithmic are used widely. Their flow is simple and fixed. They are also suitable to be implemented by FPGA. In this paper, the two-point and single-point method of non-uniformity correction based on FPGA are introduced. And whether the two-point correction or the single-point correction is taken is determined by external control signal. After the completion of the correction coefficients calculation, the coefficients are written into FLASH so that the data will not be lost when the system is powered off.

scholarly journals Spectral Artificial Vision Endoscopy for Assisting the Differential Diagnosis of Endometrial Polyps, In Vivo

2021 ◽  
Vol 4 (1) ◽  
pp. 418-424
Author(s):  
Gkrozou F ◽  
Rossos C ◽  
Tsapras A ◽  
Kortsalioudakis N ◽  
Tsonis O ◽  
...  
Keyword(s):  
Infrared Imaging ◽  
Narrow Band ◽  
Narrow Band Imaging ◽  
Imaging Modality ◽  
Artificial Vision ◽  
Clinical Validation ◽  
Spectral Mapping ◽  
Endometrial Polyps ◽  
Pilot Clinical Study

We are the first to present results from a pilot clinical study designed for the purpose of establishing spectral mapping patterns, as a potential novel imaging assay for identifying and discriminating between functional and nonfunctional endometrial polyps in vivo. The Spectral Artificial Vision Endoscope (SAVE) was used and validated in this study. The SAVE system, adapted to a regular hysteroscope, was able to operate in several  imaging modes, including color imaging, infrared imaging, narrow band imaging and spectral mapping, all acquired at a video rate and simultaneously. The spectral maps generated by the SAVE system for 28 patients  with endometrial polyps displayed characteristic patterns capable of discriminating functional from nonfunctional polyps with remarkable consistency (Spearman R=0.912, p<10-6). These preliminary clinical validation results highlighted the great potential of the in vivo spectral mapping imaging modality as an adjunct tool to conventional color camera-based hysteroscopy, offering improved and quantitative diagnosis.

Point mapping method in investigating the dynamics of relay stabilization with account for nonlinearity of the speed sensor, delays, and time-independent perturbation

2021 ◽  
Author(s):  
R.P. Simonyants ◽  
V.N. Bulavkin
Keyword(s):  
Limit Cycles ◽  
Dead Zone ◽  
Mapping Method ◽  
General Purpose ◽  
Point Mapping ◽  
Speed Sensor ◽  
Literary Sources ◽  
The Dead ◽  
Phase Surface ◽  
Analytical Expressions

Using the point mapping method, we obtained analytical expressions for the first return functions for determining simple and complex attractors in the stabilization mode by a general-purpose relay controller with the linear formation of the control signal. We investigated self-oscillations with account for the operating members’ aftereffect, the dead zone of the speed sensor, and the time-independent perturbation action. The study shows that the dead zone of the speed sensor introduces significant changes in the behavior of the system, giving it new properties. The analysis of dynamic processes on a three-sheet phase surface revealed a wide variety of limit cycles and their dependence on the system’s parameters. Complex limit cycles are represented by combining simple cycles of two types, which allowed for a simplifying approach to their search based on the theory of multidimensional transformations of Yu.I. Neymark. A more complete result was obtained in comparison with the well-known literary sources.

scholarly journals High-spatial-resolution mapping of superhydrophobic cicada wing surface chemistry using infrared microspectroscopy and infrared imaging at two synchrotron beamlines

2013 ◽  
Vol 20 (3) ◽  
pp. 482-489 ◽  
Author(s):  
Mark J. Tobin ◽  
Ljiljana Puskar ◽  
Jafar Hasan ◽  
Hayden K. Webb ◽  
Carol J. Hirschmugl ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Spatial Resolution ◽  
Infrared Imaging ◽  
Antibacterial Properties ◽  
Significant Degree ◽  
Distribution Maps ◽  
Infrared Microspectroscopy ◽  
Aerodynamic Properties ◽  
Industry Applications ◽  
Chemical Distribution

The wings of some insects, such as cicadae, have been reported to possess a number of interesting and unusual qualities such as superhydrophobicity, anisotropic wetting and antibacterial properties. Here, the chemical composition of the wings of the Clanger cicada (Psaltoda claripennis) were characterized using infrared (IR) microspectroscopy. In addition, the data generated from two separate synchrotron IR facilities, the Australian Synchrotron Infrared Microspectroscopy beamline (AS-IRM) and the Synchrotron Radiation Center (SRC), University of Wisconsin-Madison, IRENI beamline, were analysed and compared. Characteristic peaks in the IR spectra of the wings were assigned primarily to aliphatic hydrocarbon and amide functionalities, which were considered to be an indication of the presence of waxy and proteinaceous components, respectively, in good agreement with the literature. Chemical distribution maps showed that, while the protein component was homogeneously distributed, a significant degree of heterogeneity was observed in the distribution of the waxy component, which may contribute to the self-cleaning and aerodynamic properties of the cicada wing. When comparing the data generated from the two beamlines, it was determined that the SRC IRENI beamline was capable of producing higher-spatial-resolution distribution images in a shorter time than was achievable at the AS-IRM beamline, but that spectral noise levels per pixel were considerably lower on the AS-IRM beamline, resulting in more favourable data where the detection of weak absorbances is required. The data generated by the two complementary synchrotron IR methods on the chemical composition of cicada wings will be immensely useful in understanding their unusual properties with a view to reproducing their characteristics in, for example, industry applications.

Improvement of uncooled infrared imaging detector by using mesoporous silica as a thermal isolation layer

2008 ◽  
Vol 34 (4) ◽  
pp. 833-836 ◽  
Author(s):  
Sun Gyu Choi ◽  
Tae-Jung Ha ◽  
Byoung-Gon Yu ◽  
Seung Pil Jaung ◽  
Ohmyoung Kwon ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Infrared Imaging ◽  
Thermal Isolation ◽  
Isolation Layer ◽  
Imaging Detector ◽  
Uncooled Infrared Imaging
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