Light Transmittance by Organic Eyeglass Lenses According to their Class

2018 ◽  
Vol 55 (3) ◽  
pp. 438-441
Author(s):  
Kinga Jez ◽  
Marcin Nabialek ◽  
Konrad Gruszka ◽  
Michal Deka ◽  
Slawomir Letkiewicz ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Infrared Radiation ◽  
Electromagnetic Waves ◽  
Uv Protection ◽  
Light Transmittance ◽  
Human Eye ◽  
Visible Part

The research concerns the transmission of electromagnetic waves with a wavelength corresponding to the visible part of the spectrum and part of the ultraviolet and infrared radiation range. Light transmittance through ocular lenses was tested using a UV-Vis spectrophotometer for the wavelength range 250-850 nm. Obtained results encourage reflection on the quality of the spectacle lenses produced. The obtained results do not confirm the assurances of producers about the increase in light transmittance in the range of wavelengths corresponding to the highest sensitivity of the human eye. In addition, lenses having UV protection coatings do not perform their function in a proper way. Eyeglass lenses of various classes were tested, equipped with various refining coatings. The effect of the number of coatings on the transmission of light through the lenses was not observed. Conducting and publishing studies such as those presented in this work may have a significant impact on the improvement of the quality of manufactured eyeglass lenses.

Effects of parboiling and infrared radiation drying on the quality of germinated brown rice

2021 ◽  
Author(s):  
Natthaporn Chatchavanthatri ◽  
Tiraporn Junyusen ◽  
Weerachai Arjharn ◽  
Tawarat Treeamnuk ◽  
Payungsak Junyusen ◽  
...  
Keyword(s):  
Infrared Radiation ◽  
Brown Rice ◽  
Germinated Brown Rice

scholarly journals The Calibration Home Base for Imaging Spectrometers

2016 ◽  
Vol 2 ◽  
Author(s):  
Johannes Felix Simon Brachmann ◽  
Andreas Baumgartner ◽  
Peter Gege
Keyword(s):  
Wavelength Range ◽  
Stray Light ◽  
Third Party ◽  
Home Base ◽  
Geometric Calibration ◽  
Wide Range ◽  
Along Track ◽  
Near Future

The Calibration Home Base (CHB) is an optical laboratory designed for the calibration of imaging spectrometers for the VNIR/SWIR wavelength range. Radiometric, spectral and geometric calibration as well as the characterization of sensor signal dependency on polarization are realized in a precise and highly automated fashion. This allows to carry out a wide range of time consuming measurements in an ecient way. The implementation of ISO 9001 standards in all procedures ensures a traceable quality of results. Spectral measurements in the wavelength range 380–1000 nm are performed to a wavelength uncertainty of +- 0.1 nm, while an uncertainty of +-0.2 nm is reached in the wavelength range 1000 – 2500 nm. Geometric measurements are performed at increments of 1.7 µrad across track and 7.6 µrad along track. Radiometric measurements reach an absolute uncertainty of +-3% (k=1). Sensor artifacts, such as caused by stray light will be characterizable and correctable in the near future. For now, the CHB is suitable for the characterization of pushbroom sensors, spectrometers and cameras. However, it is planned to extend the CHBs capabilities in the near future such that snapshot hyperspectral imagers can be characterized as well. The calibration services of the CHB are open to third party customers from research institutes as well as industry.

scholarly journals Osseus: A Method Based on Artificial Intelligence and Electromagnetic Waves for Ancillary Diagnosis of Osteoporosis

2021 ◽  
Author(s):  
Gabriela Albuquerque¹ ◽  
Agnaldo Cruz¹ ◽  
Dionísio Carvalho¹ ◽  
Nadja Mayrink¹ ◽  
Bruno Pinheiro¹ ◽  
...  
Keyword(s):  
Artificial Intelligence ◽  
Bone Mineral Density ◽  
Bone Mineral ◽  
Electromagnetic Waves ◽  
Bone Structure ◽  
Middle Finger ◽  
Health Condition ◽  
Signal Attenuation ◽  
Mineral Density

Abstract Background: Osteoporosis is characterized by low bone mineral density, which causes fractures and compromises people's quality of life. Diagnostic devices for assessing this health condition, such as Dual Energy X-ray Absorptiometry (DXA), are very costly. Therefore, it is impracticable to meet the demand for tests in Brazil's 5,568 municipalities. Given that, we proposed a pre-clinical validation of a prototype developed to aid bone mineral density classification. Thus, Osseus integrates a microcontroller with other peripheral devices to measure the electromagnetic permittivity at the middle phalanx of the middle finger, with two antennas operating in the 2.45 GHz frequency range. Using Artificial Intelligence to identify risk factors alongside signal attenuation measurement indicates the need for DXA. Results: We conducted tests with plaster, Galliformes, and porcine bones. Comparison of the measurements of the original and mechanically altered samples have demonstrated that the device can handle the complexity of the tissues within the bone structure and characterize its microarchitecture. Conclusions: Osseus is a prototype and has been preliminarily validated. There is a lack of validation studies with the reference/gold standard that are currently under development. Osseus enables early detection of osteoporosis, reduces costs, and optimizes high-complexity testing referrals.

Drying characteristics and quality of Stevia rebaudiana leaves by far-infrared radiation

LWT ◽  
2021 ◽  
Vol 140 ◽  
pp. 110638
Author(s):  
Xiaopeng Huang ◽  
Wuqiang Li ◽  
Yongmei Wang ◽  
Fangxin Wan
Keyword(s):  
Infrared Radiation ◽  
Stevia Rebaudiana ◽  
Far Infrared ◽  
Drying Characteristics ◽  
Far Infrared Radiation

Image quality of the human eye for eccentric entrance pupils

1983 ◽  
Vol 23 (5) ◽  
pp. 573-579 ◽  
Author(s):  
A. Van Meeteren ◽  
C.J.W. Dunnewold
Keyword(s):  
Image Quality ◽  
Human Eye

scholarly journals The potential of many-line inversions of photospheric spectropolarimetric data in the visible and near UV

2019 ◽  
Vol 622 ◽  
pp. A36 ◽  
Author(s):  
T. L. Riethmüller ◽  
S. K. Solanki
Keyword(s):  
Wavelength Range ◽  
Solar Physics ◽  
Solar Observatory ◽  
Spectral Lines ◽  
Resolving Power ◽  
Short Wavelength Range ◽  
Photon Noise ◽  
Infrared Spectral ◽  
The Many

Our knowledge of the lower solar atmosphere is mainly obtained from spectropolarimetric observations, which are often carried out in the red or infrared spectral range and almost always cover only a single or a few spectral lines. Here we compare the quality of Stokes inversions of only a few spectral lines with many-line inversions. In connection with this, we have also investigated the feasibility of spectropolarimetry in the short-wavelength range, 3000 Å−4300 Å, where the line density but also the photon noise are considerably higher than in the red, so that many-line inversions could be particularly attractive in that wavelength range. This is also timely because this wavelength range will be the focus of a new spectropolarimeter in the third science flight of the balloon-borne solar observatory SUNRISE. For an ensemble of state-of-the-art magneto-hydrodynamical atmospheres we synthesize exemplarily spectral regions around 3140 Å (containing 371 identified spectral lines), around 4080 Å (328 lines), and around 6302 Å (110 lines). The spectral coverage is chosen such that at a spectral resolving power of 150 000 the spectra can be recorded by a 2K × 2K detector. The synthetic Stokes profiles are degraded with a typical photon noise and afterward inverted. The atmospheric parameters of the inversion of noisy profiles are compared with the inversion of noise-free spectra. We find that significantly more information can be obtained from many-line inversions than from a traditionally used inversion of only a few spectral lines. We further find that information on the upper photosphere can be significantly more reliably obtained at short wavelengths. In the mid and lower photosphere, the many-line approach at 4080 Å provides equally good results as the many-line approach at 6302 Å for the magnetic field strength and the line-of-sight (LOS) velocity, while the temperature determination is even more precise by a factor of three. We conclude from our results that many-line spectropolarimetry should be the preferred option in the future, and in particular at short wavelengths it offers a high potential in solar physics.

Sign in / Sign up

Export Citation Format

Share Document