scholarly journals Theoretical Research on Ellipsoidal Structure Methane Gas Detection Based on Near Infrared Light Sources of PbSe Quantum Dots

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Xiaoxue Xing ◽  
Yanmin Lei ◽  
Weiwei Shang ◽  
Limin Du ◽  
Pan Guo
Keyword(s):  
Quantum Dots ◽  
Light Source ◽  
Near Infrared ◽  
Detection System ◽  
Cell Structure ◽  
Detection Sensitivity ◽  
Gas Detection ◽  
Theoretical Research ◽  
Infrared Light ◽  
Light Sources

To improve the precision and sensitivity of the detection in near infrared gas detection system, the selection of light source and design of gas chamber structure are two key links. In this paper, the near infrared (NIR) light sources fabricated with PbSe quantum dots (QDs) and a new gas cell structure using an ellipsoid reflector were designed to test the concentration of methane (CH4). The double wavelengths differential detection method was used in the paper. The signal wavelength is 1.665 μm from the NIR QD-based light source with 5.1 nm PbSe QDs. The reference wavelength is 1.943 μm from the NIR QD-based light source with 6.1 nm PbSe QDs. The experimental results show that the differential gain signal could be enhanced 80 times when the major axis, the focus, and the open length of the ellipsoid reflector are 4.18 cm, 3.98 cm, and 0.36 cm, respectively. The structure will be convenient for the signal amplifying, AD converting, and other process in the latter circuits, and therefore both the detection sensitivity and precision can be improved.

scholarly journals Dental Imaging With Near-Infrared Transillumination Using Random Fiber Laser

2020 ◽  
Vol 10 (4) ◽  
pp. 333-339
Author(s):  
Jiayu Guo ◽  
Yunjiang Rao ◽  
Weili Zhang ◽  
Zewen Cui ◽  
Anran Liu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Light Source ◽  
Near Infrared ◽  
Infrared Light ◽  
Deep Penetration ◽  
Light Sources ◽  
Caries Lesion ◽  
Dental Imaging ◽  
Low Coherence ◽  
Source Selection

Abstract Contrary to the conventional detection method like radiography, the near infrared light source has been demonstrated to be suitable for dental imaging due to different reflectivity among enamel, dentin, and caries lesion. In this paper, three light sources with different bandwidths based on a transillumination method are compared. The contrast among enamel, dentin, and caries lesion is calculated in different situations. The experimental results show that the random fiber laser has the best comprehensive quality in dental imaging due to its high spectral density, low coherence, and deep penetration. This work provides a guidance for light source selection in dental imaging.

scholarly journals Integration of Emission-Wavelength-Controlled InAs Quantum Dots for Ultra-Broadband Near-Infrared Light Source

10.5772/59315 ◽  
2014 ◽  
Vol 4 ◽  
pp. 26 ◽  
Author(s):  
Nobuhiko Ozaki ◽  
Koichi Takeuchi ◽  
Yuji Hino ◽  
Yohei Nakatani ◽  
Takuma Yasuda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Source ◽  
Near Infrared ◽  
Emission Wavelength ◽  
Infrared Light ◽  
Near Infrared Light ◽  
Inas Quantum Dots

Electrically Driven Near-Infrared Broadband Light Source with Gaussian-Like Spectral Shape Based on Multiple InAs Quantum Dots

2016 ◽  
Vol E99.C (3) ◽  
pp. 381-384 ◽  
Author(s):  
Takuma YASUDA ◽  
Nobuhiko OZAKI ◽  
Hiroshi SHIBATA ◽  
Shunsuke OHKOUCHI ◽  
Naoki IKEDA ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Source ◽  
Near Infrared ◽  
Spectral Shape ◽  
Inas Quantum Dots ◽  
Broadband Light Source

scholarly journals Photothermal Therapy Using Gold Nanorods and Near-Infrared Light in a Murine Melanoma Model Increases Survival and Decreases Tumor Volume

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mary K. Popp ◽  
Imane Oubou ◽  
Colin Shepherd ◽  
Zachary Nager ◽  
Courtney Anderson ◽  
...  
Keyword(s):  
Light Source ◽  
Gold Nanorods ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Tumor Volume ◽  
Infrared Light ◽  
Led Light ◽  
Murine Melanoma ◽  
Nir Light ◽  
Melanoma Model

Photothermal therapy (PTT) treatments have shown strong potential in treating tumors through their ability to target destructive heat preferentially to tumor regions. In this paper we demonstrate that PTT in a murine melanoma model using gold nanorods (GNRs) and near-infrared (NIR) light decreases tumor volume and increases animal survival to an extent that is comparable to the current generation of melanoma drugs. GNRs, in particular, have shown a strong ability to reach ablative temperatures quickly in tumors when exposed to NIR light. The current research tests the efficacy of GNRs PTT in a difficult and fast growing murine melanoma model using a NIR light-emitting diode (LED) light source. LED light sources in the NIR spectrum could provide a safer and more practical approach to photothermal therapy than lasers. We also show that the LED light source can effectively and quickly heatin vitroandin vivomodels to ablative temperatures when combined with GNRs. We anticipate that this approach could have significant implications for human cancer therapy.

The development of TDLAS CO2 gas detection system with VCSEL light source

2021 ◽  
Author(s):  
Tongxin Dai ◽  
Biao Wang ◽  
Yongbo Yu ◽  
Linxiang Chen ◽  
Shuo Huang ◽  
...  
Keyword(s):  
Light Source ◽  
Detection System ◽  
Gas Detection ◽  
Co2 Gas

Near-Infrared Light Emitting Diode Based Non-Invasive Glucose Detection System

2019 ◽  
Vol 19 (10) ◽  
pp. 6187-6191 ◽  
Author(s):  
Seung Ho Lee ◽  
Min Seok Kim ◽  
Ok-Kyun Kim ◽  
Hyung-Hwan Baik ◽  
Ji-Hye Kim
Keyword(s):  
Near Infrared ◽  
Detection System ◽  
Light Emitting Diode ◽  
Infrared Light ◽  
Glucose Detection ◽  
Near Infrared Light ◽  
Light Emitting ◽  
Non Invasive

Near‐Infrared‐Light‐Triggered Antimicrobial Indium Phosphide Quantum Dots

2019 ◽  
Vol 58 (33) ◽  
pp. 11414-11418 ◽  
Author(s):  
Max Levy ◽  
John R. Bertram ◽  
Kristen A. Eller ◽  
Anushree Chatterjee ◽  
Prashant Nagpal
Keyword(s):  
Quantum Dots ◽  
Indium Phosphide ◽  
Near Infrared ◽  
Infrared Light ◽  
Near Infrared Light
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