Time-gated Raman spectroscopy for biomedical application under ambient or strong background light conditions

A new method for single-wavelength detection (SWD) spectroscopy has been developed with the use of synchronous scanning of an optical parametric oscillator (OPO). With the combination of SWD with spatial and temporal discrimination, a high level of background light rejection is achieved. Results show sufficient ambient room light rejection for obtaining complete gas-phase nonlinear Raman spectra with no detectable signs of interference.

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Development of an automatic visual grading system for grafting seedlings

Advances in Mechanical Engineering ◽

10.1177/1687814016686265 ◽

2017 ◽

Vol 9 (1) ◽

pp. 168781401668626 ◽

Cited By ~ 2

Author(s):

Subo Tian ◽

Zifan Wang ◽

Jifeng Yang ◽

Zichen Huang ◽

Ruili Wang ◽

...

Keyword(s):

Image Processing ◽

Computer Vision ◽

Grading System ◽

Natural Light ◽

Maximum Frequency ◽

Light Conditions ◽

Visual Grading ◽

Key Technology ◽

Background Light ◽

Blue Background

In this study, a visual grading system of vegetable grafting machine was developed. The study described key technology of visual grading system of vegetable grafting machine. First, the contrasting experiment was conducted between acquired images under blue background light and natural light conditions, with the blue background light chosen as lighting source. The Visual C++ platform with open-source computer vision library (Open CV) was used for the image processing. Subsequently, maximum frequency of total number of 0-valued pixels was predicted and used to extract the measurements of scion and rootstock stem diameters. Finally, the developed integrated visual grading system was experimented with 100 scions and rootstock seedlings. The results showed that success rate of grading reached up to 98%. This shows that selection and grading of scion and rootstock could be fully automated with this developed visual grading system. Hence, this technology would be greatly helpful for improving the grading accuracy and efficiency.

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A photomultiplier tube test stand and on-site measurements to characterise the performance of Photonis XP3062 photomultiplier tubes at increased background light conditions and lower gain

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2019.05.065 ◽

2019 ◽

Vol 938 ◽

pp. 20-28

Author(s):

J. Zorn ◽

K. Daumiller ◽

R. Engel ◽

H.-J. Mathes ◽

M. Riegel ◽

...

Keyword(s):

Test Stand ◽

Photomultiplier Tube ◽

Light Conditions ◽

Photomultiplier Tubes ◽

Background Light ◽

Tube Test

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Branched gold nanoparticles on ZnO 3D architecture as biomedical SERS sensors

RSC Advances ◽

10.1039/c5ra13280k ◽

2015 ◽

Vol 5 (113) ◽

pp. 93644-93651 ◽

Cited By ~ 16

Author(s):

S. Picciolini ◽

N. Castagnetti ◽

R. Vanna ◽

D. Mehn ◽

M. Bedoni ◽

...

Keyword(s):

Gold Nanoparticles ◽

Raman Spectroscopy ◽

Cancer Cells ◽

Biomedical Application ◽

Surface Enhanced Raman Spectroscopy ◽

Drug Detection ◽

3D Surface ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

3D Architecture

We present a new 3D surface-enhanced Raman spectroscopy substrate made of branched gold nanoparticles supported on ZnO tetrapods that was proved to be effective in different biomedical application such as drug detection and cancer cells analysis.

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Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue

Atmospheric Chemistry and Physics ◽

10.5194/acp-10-11839-2010 ◽

2010 ◽

Vol 10 (23) ◽

pp. 11839-11849 ◽

Cited By ~ 11

Author(s):

P. Keckhut ◽

A. Hauchecorne ◽

L. Blanot ◽

K. Hocke ◽

S. Godin-Beekmann ◽

...

Keyword(s):

Stratospheric Ozone ◽

Bimodal Distribution ◽

Recovery Phase ◽

New Method ◽

Light Conditions ◽

Temperature Spectrum ◽

Background Light ◽

Spectrum Shape ◽

Ozone Monitoring

Abstract. The GOMOS ozone profiles have been analysed to evaluate the GOMOS ability to capture the long-term ozone evolution at mid-latitudes during the expected recovery phase of the ozone layer. Version 5 of the operational GOMOS ozone data has been compared with data from two of the longest ground-based instruments based on different techniques and already involved with many other previous space instrument validations. Comparisons between ground-based and GOMOS data confirm the occurrence of spurious retrievals mainly occurring since 2006. Using a selected set of data it is shown that some bad retrievals are induced by the increasing dark charge of the detectors combined with an inadequate method for its correction. This effect does not only induce a continuous bias, but is rather exhibiting a bimodal distribution including the correct profiles and the bad retrievals. For long-term analyses it is recommended filtering the data according to background light conditions and star temperature (spectrum shape). The new method of the dark charge estimate proposed to be implemented in the version 6 of the ESA algorithm seems to significantly reduce the occurrence of such effects and should allow to monitor stratospheric ozone using GOMOS data with greater confidence.

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