Fiber-Optic Temperature Sensors with Chalcogenide Glass and Crystalline Sensing Element (original) (raw)
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Are the Temperature Sensors Based on Chalcogenide Glass Possible?
Oxide Materials For Electronic Engineering - Fabrication, Properties and Applications, 2013
Principal possibility of the using of chalcogenide glasses (on the example of Ge 18 As 18 Se 64) as active media for temperature sensors is considered in this work. Differential scanning calorimetry testing of the investigated glasses showed that 2 years of natural storage does not lead to the drift of their parameters (glass transition temperature and endothermic peak area). Investigations of the temperature dependence of optical transmission spectra showed the linear character of optical band-gap changes with a temperature. Temperature sensitivity index for glassy Ge 18 As 18 Se 64 was estimated to be equal to the ~1.2•10-3 eV/°C.
Effect of Temperature on the Absorption Loss of Chalcogenide Glass Fibers
Applied Optics, 1999
The change in the absorption loss of IR-transmitting chalcogenide glass fibers in the temperature range of Ϫ90°C Յ T Յ 70°C was investigated. For sulfur-based glass fibers the change in loss relative to room temperature was slightly affected by the temperature in the wavelength region of 1-5 m. For Ն 6 m the change in loss was mainly due to multiphonon absorption. The change in loss for tellurium-based glass fibers increased significantly at T ϭ 60°C. The increase in the loss at short wavelengths ͑ Յ 4.1 m͒ was due to electronic excitations in the tail states. Between 5 and 9 m there was noticeable free-carrier absorption. Beyond Ն 9 m, multiphonon absorption dominated the loss spectrum.
Thermal and Optical Study of Te15 (Se100-xBix) 85 (x= 0, 1, 3) Chalcogenide Glasses
2011
(Se 100-x Bi x ) 85 (x 0, 1, 3 at. %) glassy alloys. The glass transition temperature (T g ), crystallization temperature (T c ) and melting temperature (T m ) are found from the DTA plots taken at different heating rates of 10, 15, 20 and 25 K/min. The glass transition temperature and melting temperature have been found to increase and the crystallization temperature has been found to decrease with increase in Bi content (x). Refractive index and optical energy gap of the films have been calculated from the transmission spectra taken in the spectral range 400-2300 nm. The refractive index decreases with wavelength and the optical band gap decreases with increase in Bi content.
Journal of Non-crystalline Solids, 2004
In this work we determine the thermo-optical properties of two chalcogenide glasses (in mol%): 65 Ga 2 S 3 ; 30 La 2 S 3 ; 5 La 2 O 3 (Ga:La:S) and 72.5 Ga 2 S 3 ; 27.5 La 2 O 3 (Ga:La:S:O). The thermal relaxation calorimetry and the thermal lens technique were combined so that the samples specific heat, thermal diffusivity, thermal conductivity, and the temperature coefficient of the optical path length change could be measured. Our results indicate that changes in thermal diffusivity ($2.7 · 10 À3 cm 2 /s) and conductivity ($4.8 · 10 À3 W/K cm) observed when La 2 O 3 is added in the glass compounds are less than the error in the data.
Glass formation, density, microhardness, and optical properties of As–Si–Te chalcogenide alloys
Journal of Non-Crystalline Solids, 1999
The As±Si±Te glasses are IR transparent, have relatively high glass transition temperatures among the chalcogenide glasses, and thus have been considered suitable in high temperature IR-optical applications. Sixty one As±Si±Te alloys of various compositions were prepared, and their glass formation, glass transition temperatures, density, microhardness, and IR transmittance were experimentally determined. By quenching the As±Si±Te melt in air, glasses can be formed in the As±Si±Te system. Some of the as-quenched alloys are completely amorphous, and some are partially amorphous and partially crystalline. Most notably, some As±Si±Te alloys exhibit volatility. Although the As±Si±Te glasses have good IR transmittance, the oxygen impurities in the glasses cause IR absorption at the wave numbers of 690 cm À1 and 960 cm À1 . Their glass transition temperature (T g ) decrease with Te contents, and the highest T g found in this study is at 394°C for the As 0X2 Si 0X4 Te 0X4 . The densities of As±Si±Te alloys increase with higher silicon content. The microhardness of As±Si±Te alloys is relatively high among chalcogenide glasses and its value increases with increasing silicon content. Ó 0022-3093/99/$ -see front matter Ó 1999 Elsevier Science B.V. All rights reserved. PII: S 0 0 2 2 -3 0 9 3 ( 9 9 ) 0 0 4 1 3 -5
Applications of chalcogenide glass optical fibers
Comptes Rendus Chimie, 2002
Chalcogenide glass fibers based on sulphide, selenide, telluride and their rare earth doped compositions are being actively pursued both at the Naval Research Laboratory (NRL) and worldwide. Great strides have been made in reducing optical losses using improved chemical purification techniques, but further improvements are needed in both purification and fiberization technology to attain the theoretical optical losses. Despite this, chalcogenide glass fibers are enabling numerous applications which include laser power delivery, chemical sensing, imaging, scanning near field microscopy/spectroscopy, IR sources/lasers, amplifiers and optical switches.
Analysis of Chalcogenide Glass Optical Fibres by Exafs
Le Journal De Physique Colloques, 1985
Chalcogenide optical fibres (GeAsTeSe type) are interesting for trans mission in the 4-11 um range, the introduction of tellurium into this type of glass resulting in a shifting of the infrared absorption edge toward longer wavelengths. To study the intrinsic absorption causes, we performed by EXAFS an analysis of the short range order of glasses before and after fibre drawing. Results show that the addition of tellurium does not affect the local structure of the selenium, while that of Ge or As seems modified.
In this work we determine the thermo-optical properties of two chalcogenide glasses (in mol%): 65 Ga 2 S 3 ; 30 La 2 S 3 ; 5 La 2 O 3 (Ga:La:S) and 72.5 Ga 2 S 3 ; 27.5 La 2 O 3 (Ga:La:S:O). The thermal relaxation calorimetry and the thermal lens technique were combined so that the samples specific heat, thermal diffusivity, thermal conductivity, and the temperature coefficient of the optical path length change could be measured. Our results indicate that changes in thermal diffusivity ($2.7 · 10 À3 cm 2 /s) and conductivity ($4.8 · 10 À3 W/K cm) observed when La 2 O 3 is added in the glass compounds are less than the error in the data.
Thermal and optical properties of chalcohalide glass
Journal of Non-crystalline Solids, 2001
We report on the use of cw time-resolved Z-scan technique to investigate the thermal nonlinearity for the (mol%) 40% PbI 2 ± 30% Sb 2 S 3 ± 30% As 2 S 3 chalcohalide glass. Transient measurements were made with the sample ®xed at the peak position of the Z-scan curve, which is equivalent to the single beam thermal lens (TL) con®guration. The response time of the transient signal was used to obtain the sample thermal diusivity, D 1:3 Â 10 À3 cm 2 s À1 . The signal amplitude is proportional to the optical path length change with the heat deposited per unit volume, ds/dQ. The measurements were performed using a tunable Ti:sapphire laser in order to investigate the wavelength dependence in the range from 730 to 840 nm. This range is close to the glass Urbach tail, at k $ 700 nm, where ds/dT (or ds/dQ) increases. We observed that ds/dT increases by a factor of 9.3 when the wavelength decreases from 840 to 730 nm, while the absorption coecient increases by a factor of 1.7. Ó
Role of some modifiers on the thermo-mechanical properties of Se90In10 chalcogenide glass (ChGs)
European Physical Journal-applied Physics, 2021
The studies on the micro-hardness of ChGs provide useful information regarding their straightforward involvement in the fabrication of sensors, fibers, and other optical elements for direct use in infrared optics. This work deals with the mechanical response of the glassy Se90In10 alloy under the influence of additives (Sn, Ag, Sb, and Ge). For this, we have determined the micro-hardness of all glassy alloys. Using the values of Vickers hardness (Hv), glass transition temperature (Tg), and present glasses, we have calculated the other significant thermo-mechanical parameters. The effect of Sn, Ag, Sb, and Ge additives on the micro-hardness of glassy Se90In10 alloy is also discussed.