Optical Link Budgets

DeCusatis, Casimer

doi:10.1016/b978-0-12-401673-6.00004-0

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…By comparing the intensity of the light source with and without the sample in the light path, the absorbance can be determined. 22 To evaluate the performance of the iPhotometer, E. coli samples cultured with WST-8 for different durations were applied to calibrate the system. The absorbance measurements were taken simultaneously with both the iPhotometer and Nanodrop spectrophotometer at 450 nm for comparison.…”

Section: Resultsmentioning

confidence: 99%

A Cell Phone–Based Microphotometric System for Rapid Antimicrobial Susceptibility Testing

et al. 2014

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This study demonstrates a low-cost, portable diagnostic system for rapid antimicrobial susceptibility testing in resource-limited settings. To determine the antimicrobial resistance phenotypically, the growth of pathogens in microwell arrays is detected under different antibiotic conditions. The use of a colorimetric cell viability reagent is shown to significantly improve the sensitivity of the assay compared with standard absorbance spectroscopy. Gas-permeable microwell arrays are incorporated for facilitating rapid bacterial growth and eliminating the requirement of bulky supporting equipment. Antibiotics can also be precoated in the microwell array to simplify the assay protocol toward point-of-care applications. Furthermore, a low-cost cell phone–based microphotometric system is developed for detecting the bacterial growth in the microwell array. By optimizing the operating conditions, the system allows antimicrobial susceptibility testing for samples with initial concentrations from 101 to 106 cfu/mL. Using urinary tract infection as the model system, we demonstrate rapid antimicrobial resistance profiling for uropathogens in both culture media and urine. With its simplicity and cost-effectiveness, the cell phone–based microphotometric system is anticipated to have broad applicability in resource-limited settings toward the management of infectious diseases caused by multidrug-resistant pathogens.

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Section: Resultsmentioning

confidence: 99%

A Cell Phone–Based Microphotometric System for Rapid Antimicrobial Susceptibility Testing

et al. 2014

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“…C . Standard photometric observer function is intended to represent the visual perception of the average human eye [6]. This mathematical function is of an “ideal observer having a relative spectral responsivity curve that conforms to the spectral luminous efficiency function for photopic vision V(λ)”[5].…”

Section: Definitionsmentioning

confidence: 99%

“…For this reason, there is another type of photometer called a spectroradiometer, which measures the spectral radiometric power at each wavelength of the visible spectrum. Measurements using a spectroradiometer are, thus, spectrally balanced across the spectrum and typically produce the most accurate photometric readings [6]; however, these devices are considerably more expensive.…”

Section: Introductionmentioning

confidence: 99%

Effects of Light Spectrum on Luminance Measurements in Underground Coal Mines

Martell

Sammarco

MacDonald

2019

IEEE Trans. on Ind. Applicat.

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Lighting regulations for luminance in U. S. coal mines are verified in the field by using a luminance photometer calibrated to the Standard Illuminant A light source. Significant measurement errors can exist when measuring light sources that are dissimilar to light sources used to calibrate the photometer. This paper quantifies the measurement errors when measuring these dissimilar light sources commonly used in U.S. underground coal mines—an LED, a CFL with a clear cover, a CFL with an amber cover, and a tungsten halogen. The impact of photometer quality was also evaluated. Three different luminance measuring instruments of high, medium, and low quality were compared—a PR-650, LS-100, and PMEX, respectively. The PMEX was under evaluation for measuring luminance compliance in U.S. underground coal mines. The PR-650 was used as the referent to which the other photometers were compared. The PMEX error ranged from −17.0% to −26.5% with the highest error for the amber CFL. The LS-100 closely matched the luminance measurement for the LED and halogen; however, it had a percent error of −10.4% for the amber CFL. After the initial experiment, MSHA made improvements to the PMEX resulting in the PMEX-MSHA. The experiment was replicated using the new photometer and the newer PR-670. After repeating the experiment, the measurement errors ranged from −16% to −19% for the PMEX-MSHA, thus indicating an improvement over the PMEX. These results show that the spectral content of a light source and the photometer quality can greatly impact the accuracy of luminance measurement.

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State‐of‐the‐art all‐silicon sub‐bandgap photodetectors at telecom and datacom wavelengths

Casalino

Coppola

Rue

et al. 2016

Laser & Photonics Reviews

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Silicon-based technologies provide an ideal platform for the monolithic integration of photonics and microelectronics. In this context, a variety of passive and active silicon photonic devices have been developed to operate at telecom and datacom wavelengths, at which silicon has minimal optical absorption -due to its bandgap of 1.12 eV. Although in principle this transparency window limits the use of silicon for optical detection above 1.1 µm, in recent years tremendous advances have been achieved in the field of all-silicon subbandgap photodetectors at telecom and datacom wavelengths -by taking advantage of new emerging materials and structures. In this paper, a review of the state of the art is presented.Devices based on defect-mediated absorption, two-photon absorption and the internal photoemission effect are reported, their working principles are elucidated and their performance discussed and compared.

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Optical Link Budgets

Cited by 4 publications

References 30 publications

A Cell Phone–Based Microphotometric System for Rapid Antimicrobial Susceptibility Testing

A Cell Phone–Based Microphotometric System for Rapid Antimicrobial Susceptibility Testing

Effects of Light Spectrum on Luminance Measurements in Underground Coal Mines

State‐of‐the‐art all‐silicon sub‐bandgap photodetectors at telecom and datacom wavelengths

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