Cavity-Enhanced Raman Spectroscopy for Food Chain Management

Sandfort, Vincenz; Goldschmidt, Jens; Wöllenstein, Jürgen; Palzer, Stefan

doi:10.3390/s18030709

Cited by 25 publications

(18 citation statements)

References 84 publications

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“…Fortunately, this intrinsic drawback can be overcome by reasonable experimental setups and design of structural parameters. One promising method is to combine HCFs with cavity enhanced Raman spectroscopy (CERS) to increase the laser intensity [87][88][89][90][91][92][93][94][95][96][97] (more details on CERS are presented in review [97]), as shown in Fig. 9a, in which the two FBGs act as highly reflective mirrors to form an F-P cavity.…”

Section: Raman Spectroscopy-based Fibre Gas Sensormentioning

confidence: 99%

Review of optical fibre sensors for electrical equipment characteristic state parameters detection

et al. 2019

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Optical fibre sensing technology is a powerful method for long-term reliable sensing in harsh environments, which means it is particularly suitable for the detection of electrical equipment characteristic state parameters, including characteristic gases, abnormal vibration, ultrasonic produced by partial discharge, and abnormal temperature rise. This paper reviews several individual optical fibre sensors for different state parameters detection, discusses the advantages, limitations and possible improvement methods, and finally presents the most promising optical fibre sensor for each state parameter.

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Section: Raman Spectroscopy-based Fibre Gas Sensormentioning

confidence: 99%

Review of optical fibre sensors for electrical equipment characteristic state parameters detection

et al. 2019

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“…A major obstacle that limits the applicability of Raman spectroscopy compared with other techniques is its weak signal strength due to small cross section of gas molecules and low molecular density in the gas phase. In the past few years, different techniques are developed by different groups to raise the sensitivity of Raman spectroscopy for trace gas detection, among them are cavity-enhanced Raman spectroscopy (CERS), [3][4][5][6] fiberenhanced Raman spectroscopy (FERS), [7][8][9][10][11][12] multiplepass-enhanced Raman spectroscopy, [13][14][15][16] and nonlinear Raman spectroscopy. [17] Most Raman systems empowered by above techniques only allow for single point measurement.…”

Section: Introductionmentioning

confidence: 99%

Multiple‐pass‐enhanced multiple‐point gas Raman analyzer for industrial process control applications

Chen

Huang

Shen

2020

J Raman Spectroscopy

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We report an advanced multiple-pass multiple-point Raman spectroscopy setup with enhanced sensitivity for industrial in situ monitoring and process control applications. The design of this multiple sampling setup enables high laser effective energy utilization ratio, and full laser energy is available for each sampling point. As a result, high sensitivity is obtained in every sampling point. The setup is simple, reliable, and robust, which is important for practical industrial applications. With eight passes configuration, gas samples in static cells are tested to show the analytical potential of this multiple sampling setup. The back-to-back experimental results show that the noise equivalent detection limit (3σ) of 40.6 (N 2), 46.0 (O 2), 22.9 (H 2 O), and 19.1 Pa (hydrogen isotopologues), which corresponds to relative abundance by volume at 1 bar total pressure of 406, 459, 229, and 191 ppm, respectively, can be achieved in 1 s with a 1.5-W red laser. The analysis indicates that similar or even better sensitivity can be achieved for every sampling point in a practical 3-point system. The system precision is characterized by long-term measurement of static samples, and the results indicate high system stability. Although a 3-point system is demonstrated in this investigation, this setup can be easily upgraded to incorporate more sampling positions by increasing the number of lenses inside the multiple-pass cavity, which is important for practical applications. Important aspects regarding instrumentation engineering are also briefly discussed. The results obtained with this multiple-pass-enhanced multiple-point Raman system are very promising. The system can be applied to hydrogen isotopologues monitoring and process control in international thermonuclear experimental reactor (ITER), as well as China fusion engineering test reactor (CFETR). Other industrial applications like automotive engine diagnosis and logging gas detection can also be benefited from current design.

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“…Earlier reports indicate that electromagnetic enhancement can be achieved by near field enhancement and/or radiation enhancement [9]. Cavity Enhanced Raman Spectroscopy (CERS) was developed over the last few decades [10,11]. In this method, planar optical micro-cavities are fabricated as resonators.…”

Section: Introductionmentioning

confidence: 99%

Microcavity Enhanced Raman Spectroscopy of Fullerene C60 Bucky Balls

Damle

Sinwani

Aviv

et al. 2020

Sensors

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Raman spectroscopy is a widely used characterization technique in material science. It is a non-destructive tool with relatively simple instrumentation, and provides intrinsic qualitative information of analytes by probing their vibrational modes. In many cases, Raman enhancement is essential for detecting low-intensity signals in high-noise environments, spectrally unresolved features, and hidden modes. Here we present optical and Raman spectroscopic characterization of fullerene C 60 in a gold microcavity. The fabrication of single-layered gold mirrors is facile, low cost and direct but was proven to give considerably significant enhancement. The findings of this work demonstrate the cavity resonance as a powerful tool in obtaining tunability over individual peak for selective enhancement in the tuned spectral range. The PL of the material within the cavity has demonstrated a red shift assumed to be caused by the low-energy transitions. These transitions are induced by virtual low-energy states generated by the cavity. We further observe that adopting this principle enables resolution of active Raman modes that until now were unobserved. Finally, we assigned the new experimentally observed modes to the corresponding motions calculated by DFT.

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Cavity-Enhanced Raman Spectroscopy for Food Chain Management

Cited by 25 publications

References 84 publications

Review of optical fibre sensors for electrical equipment characteristic state parameters detection

Review of optical fibre sensors for electrical equipment characteristic state parameters detection

Multiple‐pass‐enhanced multiple‐point gas Raman analyzer for industrial process control applications

Microcavity Enhanced Raman Spectroscopy of Fullerene C60 Bucky Balls

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