Cell-phone camera Raman spectrometer

Dhankhar, Dinesh; Nagpal, Anushka; Rentzepis, P. M.

doi:10.1063/5.0046281

Cited by 13 publications

(9 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equations (1) and (2) show the proposed system’s spectral resolution analytically. Equation (1) is a Gaussian function used to fit Raman bands, and Equation (2) shows a full width at half maximum (FWHM) [ 41 , 42 ] for the Stokes lines of the ZrO 2 Raman spectra at a minimum and maximum ZF. The variable parameters were peak intensity A, the peak center position b, and the standard deviation of the Gaussian fit σ.…”

Section: Methodsmentioning

confidence: 99%

Raman and Photoluminescence Spectroscopy with a Variable Spectral Resolution

Pavić

Šoda

Gašparić

et al. 2021

Sensors

View full text Add to dashboard Cite

Raman and photoluminescence (PL) spectroscopy are important analytic tools in materials science that yield information on molecules’ and crystals’ vibrational and electronic properties. Here, we show results of a novel approach for Raman and PL spectroscopy to exploit variable spectral resolution by using zoom optics in a monochromator in the front of the detector. Our results show that the spectral intervals of interest can be recorded with different zoom factors, significantly reducing the acquisition time and changing the spectral resolution for different zoom factors. The smallest spectral intervals recorded at the maximum zoom factor yield higher spectral resolution suitable for Raman spectra. In contrast, larger spectral intervals recorded at the minimum zoom factor yield the lowest spectral resolution suitable for luminescence spectra. We have demonstrated the change in spectral resolution by zoom objective with a zoom factor of 6, but the perspective of such an approach is up to a zoom factor of 20. We have compared such an approach on the prototype Raman spectrometer with the high quality commercial one. The comparison was made on ZrO2 and TiO2 nanocrystals for Raman scattering and Al2O3 for PL emission recording. Beside demonstrating that Raman spectrometer can be used for PL and Raman spectroscopy without changing of grating, our results show that such a spectrometer could be an efficient and fast tool in searching for Raman and PL bands of unknown materials and, thereafter, spectral recording of the spectral interval of interest at an appropriate spectral resolution.

show abstract

Section: Methodsmentioning

confidence: 99%

Raman and Photoluminescence Spectroscopy with a Variable Spectral Resolution

Pavić

Šoda

Gašparić

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

“…In the transmission geometry ( Figure 5 d), dichroic mirrors are not required because transmission light directly enters the spectrometer. However, the signal from this Raman collection geometry is masked by the intense incident laser line [ 73 ]. Hence, highly efficient laser cleanup filters and laser line rejection filters are required to measure Raman spectra.…”

Section: Handheld Raman Spectrometersmentioning

confidence: 99%

“…The scattered light collection optics in right-angle geometry collects light from a large area. Therefore, it is easier to measure bulk properties such as the bulk chemical composition of a turbid media in right-angle Raman collection geometry [ 73 ].…”

Section: Handheld Raman Spectrometersmentioning

confidence: 99%

See 1 more Smart Citation

Miniaturized Raman Instruments for SERS-Based Point-of-Care Testing on Respiratory Viruses

et al. 2022

View full text Add to dashboard Cite

As surface-enhanced Raman scattering (SERS) has been used to diagnose several respiratory viruses (e.g., influenza A virus subtypes such as H1N1 and the new coronavirus SARS-CoV-2), SERS is gaining popularity as a method for diagnosing viruses at the point-of-care. Although the prior and quick diagnosis of respiratory viruses is critical in the outbreak of infectious disease, ELISA, PCR, and RT-PCR have been used to detect respiratory viruses for pandemic control that are limited for point-of-care testing. SERS provides quantitative data with high specificity and sensitivity in a real-time, label-free, and multiplex manner recognizing molecular fingerprints. Recently, the design of Raman spectroscopy system was simplified from a complicated design to a small and easily accessible form that enables point-of-care testing. We review the optical design (e.g., laser wavelength/power and detectors) of commercialized and customized handheld Raman instruments. As respiratory viruses have prominent risk on the pandemic, we review the applications of handheld Raman devices for detecting respiratory viruses. By instrumentation and commercialization advancements, the advent of the portable SERS device creates a fast, accurate, practical, and cost-effective analytical method for virus detection, and would continue to attract more attention in point-of-care testing.

show abstract

“…Most commercial Raman spectrometers utilize backscattered geometry; this geometry results in intense Raman spectra. [ 25 ] However, it is not suitable for detection in a wind‐driven environment, because it has the disadvantage of being difficult to remove the noise imposed by back reflected excitation light from the window of the wind tunnel. More importantly, Raman signals generated by the excitation of the window or the airflow will also be collected and influence the measurement results; for example, silicon dioxide from the optical elements such as lenses and the window will affect the measurement of the oxidation process of silicon carbide.…”

Section: System Constructionmentioning

confidence: 99%

Raman detection system for in situ oxidation and ablation analysis in hypersonic wind tunnel

et al. 2022

J Raman Spectroscopy

View full text Add to dashboard Cite

We have developed a system for remote Raman spectra detection in hypersonic wind tunnel, which can be used in extreme environments such as ultra‐high temperature, high pressure, and complex airflow to measure in situ Raman spectra of ceramic matrix composites during oxidation, phase transformation or ablation. The designed system avoids stray light generated by windows and airflow through oblique incidence of excitation light. The time‐resolved method combined with pulsed laser and intensified charge‐coupled device (ICCD) was used to reduce the thermal emission background. An optical structure design based on fiber bundle is adopted to suppress the influence of aero‐optical effects and mechanical vibration on Raman spectrum acquisition. We demonstrated the feasibility of in situ Raman spectra detection in a Mach 5 combustion wind tunnel system. The design of anti‐interference prevents Raman spectra intensity from the influence of wind tunnel testing conditions.

show abstract

Cell-phone camera Raman spectrometer

Cited by 13 publications

References 31 publications

Raman and Photoluminescence Spectroscopy with a Variable Spectral Resolution

Raman and Photoluminescence Spectroscopy with a Variable Spectral Resolution

Miniaturized Raman Instruments for SERS-Based Point-of-Care Testing on Respiratory Viruses

Raman detection system for in situ oxidation and ablation analysis in hypersonic wind tunnel

Contact Info

Product

Resources

About