Conventional and standoff pulsed laser–Raman–echelle–time-gated (PRET) system

K. M. Muhammed Shameem, M. M. Tamboli, Praveen Devangad, V. K. Unnikrishnan, Sajan D. George, V. B. Kartha, C. Santhosh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Time-gated Raman system has been assembled using a pulsed laser and high-resolution echelle spectrograph. Echelle spectrograph provides broad spectral band-pass of 0–8500 cm−1 in a single scan with a resolution of 1.75 cm−1 for 532 nm at an extremely small slit width of 10 μm. Advantages of gated mode detection over continuous-wave mode detection are improved signal-to-noise ratio, reduced background signal, and unwanted fluorescent emission. Feasibility of echelle spectrograph for Raman measurements has been tested for both conventional and standoff distance of 5 m with all the external illumination sources on. The echelle system provides high-quality Raman signals with an extremely low inherent bandwidth in solid and liquid samples, (~8 cm−1) for 478 cm−1 fundamental band of sulfur. Intensity ratio of e2 fundamental to a1 fundamental of conventional and remote Raman measurements indicates that the spectral features remain the same in both measurements. The advantages of ‘time-gated’ Raman compared with continuous-wave mode detection, like low background even under extraneous illumination and lowered fluorescence, are also illustrated with spectrum of sulfur taken in the two modes.

Original languageEnglish
Pages (from-to)785-788
Number of pages4
JournalJournal of Raman Spectroscopy
Volume48
Issue number6
DOIs
Publication statusPublished - 01-06-2017

Fingerprint

Spectrographs
Sulfur
Lighting
Pulsed lasers
Signal to noise ratio
Fluorescence
Bandwidth
Liquids

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Spectroscopy

Cite this

Muhammed Shameem, K. M. ; Tamboli, M. M. ; Devangad, Praveen ; Unnikrishnan, V. K. ; George, Sajan D. ; Kartha, V. B. ; Santhosh, C. / Conventional and standoff pulsed laser–Raman–echelle–time-gated (PRET) system. In: Journal of Raman Spectroscopy. 2017 ; Vol. 48, No. 6. pp. 785-788.
@article{462feb87bd274873ae11d4ad44c5db23,
title = "Conventional and standoff pulsed laser–Raman–echelle–time-gated (PRET) system",
abstract = "Time-gated Raman system has been assembled using a pulsed laser and high-resolution echelle spectrograph. Echelle spectrograph provides broad spectral band-pass of 0–8500 cm−1 in a single scan with a resolution of 1.75 cm−1 for 532 nm at an extremely small slit width of 10 μm. Advantages of gated mode detection over continuous-wave mode detection are improved signal-to-noise ratio, reduced background signal, and unwanted fluorescent emission. Feasibility of echelle spectrograph for Raman measurements has been tested for both conventional and standoff distance of 5 m with all the external illumination sources on. The echelle system provides high-quality Raman signals with an extremely low inherent bandwidth in solid and liquid samples, (~8 cm−1) for 478 cm−1 fundamental band of sulfur. Intensity ratio of e2 fundamental to a1 fundamental of conventional and remote Raman measurements indicates that the spectral features remain the same in both measurements. The advantages of ‘time-gated’ Raman compared with continuous-wave mode detection, like low background even under extraneous illumination and lowered fluorescence, are also illustrated with spectrum of sulfur taken in the two modes.",
author = "{Muhammed Shameem}, {K. M.} and Tamboli, {M. M.} and Praveen Devangad and Unnikrishnan, {V. K.} and George, {Sajan D.} and Kartha, {V. B.} and C. Santhosh",
year = "2017",
month = "6",
day = "1",
doi = "10.1002/jrs.5125",
language = "English",
volume = "48",
pages = "785--788",
journal = "Journal of Raman Spectroscopy",
issn = "0377-0486",
publisher = "John Wiley and Sons Ltd",
number = "6",

}

Conventional and standoff pulsed laser–Raman–echelle–time-gated (PRET) system. / Muhammed Shameem, K. M.; Tamboli, M. M.; Devangad, Praveen; Unnikrishnan, V. K.; George, Sajan D.; Kartha, V. B.; Santhosh, C.

In: Journal of Raman Spectroscopy, Vol. 48, No. 6, 01.06.2017, p. 785-788.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Conventional and standoff pulsed laser–Raman–echelle–time-gated (PRET) system

AU - Muhammed Shameem, K. M.

AU - Tamboli, M. M.

AU - Devangad, Praveen

AU - Unnikrishnan, V. K.

AU - George, Sajan D.

AU - Kartha, V. B.

AU - Santhosh, C.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Time-gated Raman system has been assembled using a pulsed laser and high-resolution echelle spectrograph. Echelle spectrograph provides broad spectral band-pass of 0–8500 cm−1 in a single scan with a resolution of 1.75 cm−1 for 532 nm at an extremely small slit width of 10 μm. Advantages of gated mode detection over continuous-wave mode detection are improved signal-to-noise ratio, reduced background signal, and unwanted fluorescent emission. Feasibility of echelle spectrograph for Raman measurements has been tested for both conventional and standoff distance of 5 m with all the external illumination sources on. The echelle system provides high-quality Raman signals with an extremely low inherent bandwidth in solid and liquid samples, (~8 cm−1) for 478 cm−1 fundamental band of sulfur. Intensity ratio of e2 fundamental to a1 fundamental of conventional and remote Raman measurements indicates that the spectral features remain the same in both measurements. The advantages of ‘time-gated’ Raman compared with continuous-wave mode detection, like low background even under extraneous illumination and lowered fluorescence, are also illustrated with spectrum of sulfur taken in the two modes.

AB - Time-gated Raman system has been assembled using a pulsed laser and high-resolution echelle spectrograph. Echelle spectrograph provides broad spectral band-pass of 0–8500 cm−1 in a single scan with a resolution of 1.75 cm−1 for 532 nm at an extremely small slit width of 10 μm. Advantages of gated mode detection over continuous-wave mode detection are improved signal-to-noise ratio, reduced background signal, and unwanted fluorescent emission. Feasibility of echelle spectrograph for Raman measurements has been tested for both conventional and standoff distance of 5 m with all the external illumination sources on. The echelle system provides high-quality Raman signals with an extremely low inherent bandwidth in solid and liquid samples, (~8 cm−1) for 478 cm−1 fundamental band of sulfur. Intensity ratio of e2 fundamental to a1 fundamental of conventional and remote Raman measurements indicates that the spectral features remain the same in both measurements. The advantages of ‘time-gated’ Raman compared with continuous-wave mode detection, like low background even under extraneous illumination and lowered fluorescence, are also illustrated with spectrum of sulfur taken in the two modes.

UR - http://www.scopus.com/inward/record.url?scp=85020438811&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020438811&partnerID=8YFLogxK

U2 - 10.1002/jrs.5125

DO - 10.1002/jrs.5125

M3 - Article

VL - 48

SP - 785

EP - 788

JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

SN - 0377-0486

IS - 6

ER -