Axial Transmissive f/1.8 Imaging Raman Spectrograph with Volume-Phase Holographic Filter and Grating

1993 ◽  
Vol 47 (11) ◽  
pp. 1913-1919 ◽  
Author(s):  
David E. Battey ◽  
Joseph B. Slater ◽  
Ronald Wludyka ◽  
Harry Owen ◽  
David M. Pallister ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spatial Frequency ◽  
Fiber Optic ◽  
High Spatial Frequency ◽  
Laser Line ◽  
Fiber Optic Probe ◽  
Volume Phase ◽  
Transmission Grating ◽  
Rejection Filter ◽  
Optic Probe

An axial transmissive Raman spectrograph is described. The instrument employs volume-phase holograms as the laser line rejection filter and transmission grating. The on-axis configuration and the use of a high-spatial-frequency transmission grating allows nearly diffraction-limited imaging and pixel-limited resolution at f/1.8. The performance of the instrument is demonstrated for fiber-optic probe and microprobe Raman spectroscopy.

Rugged Fiber-Optic Raman Probe for Process Monitoring Applications

2001 ◽  
Vol 55 (10) ◽  
pp. 1337-1340 ◽  
Author(s):  
Pentti Niemelä ◽  
Janne Suhonen
Keyword(s):  
Fiber Optic ◽  
Signal To Noise Ratio ◽  
Notch Filter ◽  
Laser Line ◽  
Fiber Optic Probe ◽  
Monitoring Applications ◽  
Optic Probe ◽  
Holographic Notch Filter ◽  
Filter Thickness ◽  
Raman Probe

We report on the development of a simple, rugged fiber-optic probe for process Raman measurements, in which laser line rejection is based on an absorptive longpass filter made from a direct bandgap CdTe semiconductor. The probe can be used with a fixed wavelength laser at 830 nm, and Raman spectra can be recorded down to 200 cm−1 from the laser line. The filter thickness can be adjusted for final turning of the filter edge, as the edge slope is almost independent of thickness in the range 0.1 to 1 mm. Other properties of the probe, such as its signal-to-noise ratio and signal-to-background ratio, are shown to compare well with those of a state-of-the-art probe based on holographic notch filter techniques.

Raman spectroscopy using a fiber optic probe with subwavelength aperture

1994 ◽  
Vol 64 (14) ◽  
pp. 1768-1770 ◽  
Author(s):  
Din Ping Tsai ◽  
Andreas Othonos ◽  
Martin Moskovits ◽  
Deepak Uttamchandani
Keyword(s):  
Raman Spectroscopy ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Subwavelength Aperture ◽  
Optic Probe

Raman Spectroscopy with a Fiber-Optic Probe and Multichannel Detection

2001 ◽  
Vol 78 (12) ◽  
pp. 1674 ◽  
Author(s):  
Thomas J. Vickers ◽  
Jeanne Pecha ◽  
Charles K. Mann
Keyword(s):  
Raman Spectroscopy ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Multichannel Detection ◽  
Optic Probe

scholarly journals Investigation of Raman Spectroscopy (with Fiber Optic Probe) and Chemometric Data Analysis for the Determination of Mineral Content in Aqueous Infant Formula

Foods ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 968
Author(s):  
Ming Zhao ◽  
Saif Shaikh ◽  
Renxi Kang ◽  
Maria Markiewicz-Keszycka
Keyword(s):  
Raman Spectroscopy ◽  
Infant Formula ◽  
Mineral Content ◽  
Fiber Optic ◽  
Reference Method ◽  
Least Squares Regression ◽  
Fiber Optic Probe ◽  
Optic Probe ◽  
Raman Spectral Data

This study investigated the use of Raman spectroscopy (RS) and chemometrics for the determination of eight mineral elements (i.e., Ca, Mg, K, Na, Cu, Mn, Fe, and Zn) in aqueous infant formula (INF). The samples were prepared using infant formula powder reconstituted to concentrations of 3%–13% w/w (powder: water) (n = 83). Raman spectral data acquisition was carried out using a non-contact fiber optic probe on the surface of aqueous samples in 50–3398 cm−1. ICP-AES was used as a reference method for the determination of the mineral contents in aqueous INF samples. Results showed that the best performing partial least squares regression (PLSR) models developed for the prediction of minerals using all samples for calibration achieved R2CV values of 0.51–0.95 with RMSECVs of 0.13–2.96 ppm. The PLSR models developed and validated using separate calibration (n = 42) and validation (n = 41) samples achieved R2CVs of 0.93, 0.94, 0.91, 0.90, 0.97, and 0.94, R2Ps of 0.75, 0.77, 0.31, 0.60, 0.84, and 0.80 with RMSEPs of 3.17, 0.29, 3.45, 1.51, 0.30, and 0.25 ppm for the prediction of Ca, Mg, K, Na, Fe, and Zn respectively. This study demonstrated that RS equipped with a non-contact fiber optic probe and combined with chemometrics has the potential for timely quantification of the mineral content of aqueous INF during manufacturing.

Use of a mechanical iris-based fiber optic probe for spatially offset Raman spectroscopy

2014 ◽  
Vol 39 (13) ◽  
pp. 3790 ◽  
Author(s):  
Zhiyong Wang ◽  
Hao Ding ◽  
Guijin Lu ◽  
Xiaohong Bi
Keyword(s):  
Raman Spectroscopy ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Optic Probe

Use of a Fiber Optic Probe for the Detection and Identification of Explosive Materials by Raman Spectroscopy

1995 ◽  
Vol 40 (5) ◽  
pp. 15402J ◽  
Author(s):  
Ian P. Hayward ◽  
Tracy E. Kirkbride ◽  
David N. Batchelder ◽  
Richard J. Lacey
Keyword(s):  
Raman Spectroscopy ◽  
Fiber Optic ◽  
Fiber Optic Probe ◽  
Explosive Materials ◽  
Detection And Identification ◽  
Optic Probe

scholarly journals Analysis of subcutaneous swine fat via deep Raman spectroscopy using a fiber-optic probe

The Analyst ◽  
2020 ◽  
Vol 145 (13) ◽  
pp. 4421-4426 ◽  
Author(s):  
Jeon Woong Kang ◽  
Soo Yeong Lim ◽  
Luis H. Galindo ◽  
Hongman Yoon ◽  
Ramachandra R. Dasari ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Real Time ◽  
Meat Quality ◽  
Fiber Optic ◽  
Fat Content ◽  
Fiber Optic Probe ◽  
Quality Grading ◽  
Optic Probe

Since the fat content of pork is a deciding factor in meat quality grading, the use of a noninvasive subcutaneous probe for real-time in situ monitoring of the fat components is of importance to vendors and other interested parties.

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