scholarly journals Euclid near infrared spectrophotometer instrument concept and first test results at the end of phase B

2014 ◽  
Author(s):  
Thierry Maciaszek ◽  
Anne Ealet ◽  
Knud Jahnke ◽  
Eric Prieto ◽  
Rémi Barbier ◽  
...  
Keyword(s):  
Near Infrared ◽  
Test Results ◽  
Infrared Spectrophotometer

Evaluation of a low-cost portable near-infrared spectrophotometer for in situ cocaine profiling

Talanta ◽  
2019 ◽  
Vol 200 ◽  
pp. 553-561 ◽  
Author(s):  
Maria C. Hespanhol ◽  
Celio Pasquini ◽  
Adriano O. Maldaner
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Infrared Spectrophotometer

JWST’s near infrared spectrograph status and first OTIS test results

2018 ◽  
Author(s):  
Ralf Ehrenwinkler ◽  
Peter Mosner ◽  
Hermann Karl ◽  
Martin Altenburg ◽  
Marc Maschmann ◽  
...  
Keyword(s):  
Near Infrared ◽  
Test Results

scholarly journals Cavity Ring-Down Methane Sensor for Small Unmanned Aerial Systems

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 454 ◽  
Author(s):  
Benjamin Martinez ◽  
Thomas W. Miller ◽  
Azer P. Yalin
Keyword(s):  
Near Infrared ◽  
High Sensitivity ◽  
Unmanned Aerial Systems ◽  
Test Results ◽  
Methane Sensor ◽  
Open Path ◽  
Low Mass ◽  
Aerial Systems ◽  
High Finesse ◽  
Cavity Ring Down

We present the development, integration, and testing of an open-path cavity ring-down spectroscopy (CRDS) methane sensor for deployment on small unmanned aerial systems (sUAS). The open-path configuration used here (without pump or flow-cell) enables a low mass (4 kg) and low power (12 W) instrument that can be readily integrated to sUAS, defined here as having all-up mass of <25 kg. The instrument uses a compact telecom style laser at 1651 nm (near-infrared) and a linear 2-mirror high-finesse cavity. We show test results of flying the sensor on a DJI Matrice 600 hexacopter sUAS. The high sensitivity of the CRDS method allows sensitive methane detection with a precision of ~10–30 ppb demonstrated for actual flight conditions. A controlled release setup, where known mass flows are delivered, was used to simulate point-source methane emissions. Examples of methane plume detection from flight tests suggest that isolated plumes from sources with a mass flow as low as ~0.005 g/s can be detected. The sUAS sensor should have utility for emissions monitoring and quantification from natural gas infrastructure. To the best of our knowledge, it is also the first CRDS sensor directly deployed onboard an sUAS.

Surface Defects Detection of Red Jujube Based on Near-Infrared Vision System

2013 ◽  
Vol 303-306 ◽  
pp. 573-577
Author(s):  
Min Xu ◽  
Yue Ma ◽  
Shuai Chen
Keyword(s):  
Machine Vision ◽  
Near Infrared ◽  
Surface Defects ◽  
Vision System ◽  
Infrared Image ◽  
Machine Vision System ◽  
Test Results ◽  
Quality Factors ◽  
Important Quality ◽  
Infrared Vision

Quality evaluation of agricultural and food products is important for processing, inventory control, and marketing. Fruit surface defects are important quality factors for the jujube industry, especially for high quality jujubes such as Xinjiang red jujube. This paper presents the development and test results of a machine vision system for automatic jujube surface defects detection. Unlike other near-infrared spectrometric approaches, the developed machine vision system uses reflective near-infrared image to evaluate jujube quality by analyzing two-dimensional images. Near-infrared image, vision algorithms and a variety of operational details of the system, including cameras, optics, illumination, and fruit carrier are presented. The complete machine vision system has been built, and the experimental results show that the designed machine vision system is feasible to detect the defects of jujubes.

A Photodiode-Array-Based Near-Infrared Spectrophotometer for the 600–1100 nm Wavelength Region

1989 ◽  
Vol 43 (1) ◽  
pp. 27-32 ◽  
Author(s):  
David M. Mayes ◽  
James B. Callis
Keyword(s):  
Spectral Resolution ◽  
Near Infrared ◽  
Dynamic Range ◽  
Wavelength Region ◽  
Stray Light ◽  
Silicon Photodiode ◽  
Baseline Noise ◽  
Array Detectors ◽  
Infrared Spectrophotometer ◽  
Photodiode Array

We describe a silicon photodiode-array (PDA)-based near-infrared spectrophotometer for making molecular absorption/diffuse reflectance measurements in the 600–1100 nm wavelength range. Absorptions in this spectral region arise from both low-lying electronic states and vibrational overtones of CH, NH, and OH functional groups and combination bands. One disadvantage of silicon-based array detectors is their decreasing quantum efficiency at wavelengths longer than 950 nm. For transmission measurements, this can be compensated for by the technique of spectral plane masking, which markedly improves the consistency and overall level of baseline noise as well as the dynamic range. The instrument's performance is evaluated in the areas of spectral resolution, baseline noise, stray light, and dynamic range, and a comparison is made with a state-of-the-art mechanically scanned instrument. In the study, the PDA spectrometer attained a signal-to-noise ratio two times better than that of the commercial instrument with a time efficiency advantage of twelve, while achieving a spectral resolution three times greater. Finally, the application of analyzing caustic brine solutions by rapid-scanning NIR spectroscopy is illustrated.

Myoglobin saturation in free-diving Weddell seals

1995 ◽  
Vol 79 (4) ◽  
pp. 1148-1155 ◽  
Author(s):  
G. P. Guyton ◽  
K. S. Stanek ◽  
R. C. Schneider ◽  
P. W. Hochachka ◽  
W. E. Hurford ◽  
...  
Keyword(s):  
Heart Rate ◽  
Latissimus Dorsi ◽  
Near Infrared ◽  
Lactate Production ◽  
Diving Response ◽  
Subadult Male ◽  
Dual Wavelength Laser ◽  
Normal Field ◽  
Weddell Seals ◽  
Infrared Spectrophotometer

Although the consumption of myoglobin-bound O2 (MbO2) stores in seal muscles has been demonstrated in seal muscles during laboratory simulations of diving, this may not be a feature of normal field diving in which measurements of heart rate and lactate production show marked differences from the profound diving response induced by forced immersion. To evaluate the consumption of muscle MbO2 stores during unrestrained diving, we developed a submersible dual-wavelength laser near-infrared spectrophotometer capable of measuring MbO2 saturation in swimming muscle. The probe was implanted on the surface of the latissimus dorsi of five subadult male Weddell seals (Leptonychotes weddelli) released into a captive breathing hole near Ross Island, Antarctica. Four seals had a monotonic decline of muscle O2 saturation during free diving to depths up to 300 m with median slopes of -5.12 +/- 4.37 and -2.54 +/- 1.95%/min for dives lasting < 17 and > 17 min, respectively. There was no correlation between the power consumed by swimming and the desaturation rate. Two seals had occasional partial muscle resaturations late in dives, indicating transfer of O2 from circulating blood to muscle myoglobin. Weddell seals partially consume their MbO2 stores during unrestrained free diving.

scholarly journals JWST near infrared detectors: latest test results

2009 ◽  
Author(s):  
Erin C. Smith ◽  
Bernard J. Rauscher ◽  
David Alexander ◽  
Brian L. Clemons ◽  
Chuck Engler ◽  
...  
Keyword(s):  
Infrared Detectors ◽  
Near Infrared ◽  
Test Results

Herbal-Loaded Multifunctional Nanocomposities as Nanocarrier for Cancer Therpy: Synthesis and Quality

2011 ◽  
Vol 311-313 ◽  
pp. 1625-1629 ◽  
Author(s):  
Chih Wei Chou ◽  
Sheng Yueh Chang ◽  
Yung Shiu Chen ◽  
Wu Chung Su ◽  
Te Hsing Wu
Keyword(s):  
Electron Microscope ◽  
Near Infrared ◽  
Colon Adenocarcinoma ◽  
Ultra Violet ◽  
Human Colon ◽  
Size Analysis ◽  
Transmission Electron ◽  
Infrared Spectrophotometer ◽  
Ft Ir ◽  
Human Colon Adenocarcinoma

The multifunctional nanocompoties (MFNCs) as drug release carriers are prepared by cross-linking reaction of cationic chitosan (CS) and anionic tripolyphosphate (TPP) to encapsulate Fe3O4 nanoparticles(NPs) loaded cancer therapeutic agents such as berberine (BB), KCY-24B, KCY-Tai…etc were studied. These MFNCs were characterized by fourier transform infrared spectrophotometer (FT-IR), ultra violet–visible-near infrared spectrophotometer (UV-VIS-NIR spectrophotometer), size analysis, transmission electron microscope (TEM) and field-emission scanning electron microscope (FESEM). Then we obtained here the preparation method, characterization, and capability of these efficative nanoparticles. Cell celluar uptake and distribution of MFNCs were also inspected in human colon adenocarcinoma cell lines (Colo 205).

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