Use of an OCT System in the Short-Wavelength Infrared Region: Applications

2021 ◽  
Author(s):  
Pauline John ◽  
Vani Damodaran ◽  
Nilesh J. Vasa
Keyword(s):  
Short Wavelength ◽  
Infrared Region

Characteristics of GaAs Schottky Barrier Diode in Short Wavelength Far Infrared Region and the Application

2012 ◽  
Vol 132 (9) ◽  
pp. 722-726
Author(s):  
Kazuya Nakayama ◽  
Shigeki Okajima ◽  
Kazuo Kawahata ◽  
Kenji Tanaka ◽  
Tsuyoshi Akiyama
Keyword(s):  
Schottky Barrier ◽  
Short Wavelength ◽  
Far Infrared ◽  
Infrared Region ◽  
Schottky Barrier Diode

Effects of Water on the Spectra of Model Compounds in the Short-Wavelength near Infrared Spectral Region (14,000–9091 cm−1 or 714–1100 nm)

1994 ◽  
Vol 2 (4) ◽  
pp. 199-212 ◽  
Author(s):  
James B. Reeves
Keyword(s):  
Spectral Region ◽  
Short Wavelength ◽  
Near Infrared ◽  
Wavelength Region ◽  
Infrared Region ◽  
Organic Liquids ◽  
Model Compounds ◽  
Water Solutions ◽  
Long Wavelength ◽  
Near Infrared Region

The spectral region from 14,000 to 9091 cm−1 (714–1100 nm) is increasingly being investigated for the analysis of high moisture systems due to its low absorption by water. The objective of this work was to determine if the effects of water on model compounds seen in the 7140–4000 cm−1 (1400–2500 nm) near infrared region occurred in this short wavelength region. Spectra were obtained by diffuse reflectance and transmission using a Fourier transform spectrometer. Spectra were obtained for a variety of organic liquids, liquid/water solutions, solids, wet solids and solutions of solids in water. Solutions included ethanol, acetic acid, acetone, pyridine, sugars, starch, cellulose, gums, amino acids and proteins. The spectral results showed that the effects seen in the 7140–4000 cm−1 (1400–2500 nm) region were also common in the 14,000–9091 cm−1 (714–1100 nm) region (i.e. peak shifts, loss of spectral features etc.). For example, in the long wavelength near infrared region, sugars, such as sucrose and glucose, were distinctively different as crystalline solids, but very similar in solution. In addition, molten glucose and urea appeared virtually identical to their dissolved counterparts indicating a loss of crystallinity to be the source of the changes. Finally, changes in the spectra of other materials, such as acetone, n-butylamine and ethanol (while similar in nature to those previously found in the near infrared) were not identical. Thus, while some shifts in peaks were found to occur with acetone/water mixtures, the dominant effects were changes in the relative intensities of peaks within the acetone spectrum, something not seen in the long wavelength region. Therefore, while the type of spectral effects caused by the presence of water may be similar across various spectral regions, the degree and exact nature of those effects vary with the material in question, the amount of water present and the region in question. Thus, the choice of the spectral region to be used for a specific problem should consider the materials in question, as well as other factors such as the usable pathlength.

Note on the spectral classification of carbon stars in the photographic infrared region

1966 ◽  
Vol 24 ◽  
pp. 21-23
Author(s):  
Y. Fujita
Keyword(s):  
Infrared Region ◽  
Spectral Classification ◽  
Carbon Stars

We have investigated the spectrograms (dispersion: 8Å/mm) in the photographic infrared region fromλ7500 toλ9000 of some carbon stars obtained by the coudé spectrograph of the 74-inch reflector attached to the Okayama Astrophysical Observatory. The names of the stars investigated are listed in Table 1.

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