High-speed temperature measurements using novel optical-fiber-based systems

2003 ◽  
Author(s):  
Frederic A. Bezombes ◽  
David R. Allanson ◽  
David R. Burton ◽  
Michael J. Lalor
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Temperature Measurements

High speed optical switching gain based EDFA model with 30 Gb/s NRZ modulation code in optical systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Ahmed Nabih Zaki Rashed ◽  
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Optical Switching ◽  
Fiber Amplifier ◽  
Optical Systems ◽  
Power Budget ◽  
Erbium Doped Fiber Amplifier ◽  
Amplifier Model ◽  
Modulation Rate ◽  
Modulation Code

AbstractThis study presents high speed optical switching gain based Erbium doped fiber amplifier model. By using the proposed model the optical fiber loss can be minimized. The system is stabilized with the power budget of 25.875 mW a long 75 km as a length of optical fiber in this study can be verified. The modulation rate of 10 Gb/s can be upgrade up to reach 30 Gb/s. The suitable power for the optical transmitter is −2.440 dBm and NRZ modulation code is verified. The receiver sensitivity can be upgraded with the minimum bit error rate and max Q factor are 1.806 e−009 and 5.899.

scholarly journals Wall Temperature Measurements in Gas Turbine Combustors With Thermographic Phosphors

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Patrick Nau ◽  
Zhiyao Yin ◽  
Oliver Lammel ◽  
Wolfgang Meier
Keyword(s):  
Gas Turbine ◽  
Wall Temperature ◽  
Gas Turbines ◽  
High Speed ◽  
Bluff Body ◽  
Temperature Measurements ◽  
Transient Temperature ◽  
High Time Resolution ◽  
Ceramic Surface ◽  
Precessing Vortex Core

Phosphor thermometry has been developed for wall temperature measurements in gas turbines and gas turbine model combustors. An array of phosphors has been examined in detail for spatially and temporally resolved surface temperature measurements. Two examples are provided, one at high pressure (8 bar) and high temperature and one at atmospheric pressure with high time resolution. To study the feasibility of this technique for full-scale gas turbine applications, a high momentum confined jet combustor at 8 bar was used. Successful measurements up to 1700 K on a ceramic surface are shown with good accuracy. In the same combustor, temperatures on the combustor quartz walls were measured, which can be used as boundary conditions for numerical simulations. An atmospheric swirl-stabilized flame was used to study transient temperature changes on the bluff body. For this purpose, a high-speed setup (1 kHz) was used to measure the wall temperatures at an operating condition where the flame switches between being attached (M-flame) and being lifted (V-flame) (bistable). The influence of a precessing vortex core (PVC) present during M-flame periods is identified on the bluff body tip, but not at positions further inside the nozzle.

Ripple Technique; a Novel Non-Contact Wafer Emissivity and Temperature Method for RTP

1991 ◽  
Vol 224 ◽  
Author(s):  
C. Schietinger ◽  
B. Adams ◽  
C. Yarling
Keyword(s):  
Optical Fiber ◽  
Measurement Technique ◽  
Thermal Processing ◽  
High Speed ◽  
Rapid Thermal Processing ◽  
Wafer Surface ◽  
Speed Measurement ◽  
Temperature Method ◽  
Emissivity Measurement ◽  
Emissivity Measurements

AbstractA novel wafer temperature and emissivity measurement technique for rapid thermal processing (RTP) is presented. The ‘Ripple Technique’ takes advantage of heating lamp AC ripple as the signature of the reflected component of the radiation from the wafer surface. This application of Optical Fiber Thermometry (OFT) allows high speed measurement of wafer surface temperatures and emissivities. This ‘Ripple Technique’ is discussed in theoretical and practical terms with wafer data presented. Results of both temperature and emissivity measurements are presented for RTP conditions with bare silicon wafers and filmed wafers.

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