High-Bandwidth Fiber-Optic Pressure Sensors for High-Temperature Aerospace Applications

2018 ◽  
Author(s):  
Behzad Moslehi ◽  
W Price ◽  
Richard J. Black ◽  
Ming Han ◽  
Alireza Behbahani ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Aerospace Applications ◽  
High Bandwidth

Micromachined SiC fiber optic pressure sensors for high-temperature aerospace applications

2000 ◽  
Author(s):  
Wade J. Pulliam ◽  
Patrick M. Russler ◽  
Richard Mlcak ◽  
Kent A. Murphy ◽  
Carrie L. Kozikowski
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Aerospace Applications ◽  
Sic Fiber

High-Temperature, High-Bandwidth Fiber Optic Pressure and Temperature Sensors for Gas Turbine Applications

2004 ◽  
Author(s):  
Robert Fielder ◽  
Matthew Palmer ◽  
Wing Ng ◽  
Matthew Davis ◽  
Aditya Ringshia
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Fiber Optic ◽  
Temperature Sensors ◽  
High Bandwidth

Epoxy-free high-temperature fiber optic pressure sensors for gas turbine engine applications

2004 ◽  
Author(s):  
Juncheng Xu ◽  
Gary Pickrell ◽  
Bing Yu ◽  
Ming Han ◽  
Yizheng Zhu ◽  
...  
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Gas Turbine Engine ◽  
Turbine Engine

Vacuum-sealed high temperature high bandwidth fiber optic pressure and acoustic sensors

2005 ◽  
Author(s):  
Juncheng Xu ◽  
Gary R. Pickrell ◽  
Xingwei Wang ◽  
Bing Yu ◽  
Kristie L. Cooper ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Acoustic Sensors ◽  
High Bandwidth

scholarly journals Fabrication of All-SiC Fiber-Optic Pressure Sensors for High-Temperature Applications

Sensors ◽  
2016 ◽  
Vol 16 (10) ◽  
pp. 1660 ◽  
Author(s):  
Yonggang Jiang ◽  
Jian Li ◽  
Zhiwen Zhou ◽  
Xinggang Jiang ◽  
Deyuan Zhang
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Pressure Sensors ◽  
Sic Fiber ◽  
Temperature Applications

High-temperature high-frequency turbine exit flow field measurements in a military engine with a cooled unsteady total pressure probe

2011 ◽  
Vol 225 (7) ◽  
pp. 954-963 ◽  
Author(s):  
M Mersinligil ◽  
J Desset ◽  
J F Brouckaert
Keyword(s):  
High Temperature ◽  
Total Pressure ◽  
Pressure Sensors ◽  
Field Measurements ◽  
Fast Response ◽  
Turbine Engines ◽  
Pressure Probe ◽  
Gas Turbine Engines ◽  
Time Resolved ◽  
High Bandwidth

The measurement of unsteady pressures within the hot components of gas turbine engines still remains a true challenge for test engineers. Several high-temperature pressure sensors have been developed, but so far, their applications are restricted to unsteady wall static pressure measurements. Because of the severe flow conditions such as turbine inlet temperatures of 1700 °C and pressures of 50 bar or more in the most advanced aero-engine designs, few (if any) experimental techniques exist to measure the time-resolved flow total pressure inside the gas path. This article describes the measurements performed at the turbine exit of a military engine with a cooled fast response total pressure probe. The probe concept is based on the use of a conventional miniature piezo-resistive pressure sensor, located in the probe tip to achieve a bandwidth of at least 40 kHz. Due to the extremely harsh conditions, the probe and sensor are heavily water cooled. The probe was designed to be continuously immersed into the hot gas stream to obtain time series of pressure with a high bandwidth and therefore statistically representative average fluctuations at the blade passing frequency (BPV). The experimental results obtained with a second-generation prototype are presented. The probe was immersed into the engine through the bypass duct between turbine exit and flame-holders of the afterburner of a Volvo RM12 engine, at exhaust temperatures above 900 °C. The probe was able to resolve the BPV (∼17 kHz) and several harmonics up to 100 kHz.

CURRENT STATE OF METHODS AND MEANS OF REGISTRATION OF HIGH TEMPERATURES AND MECHANICAL STRESSES IN STRUCTURES

2020 ◽  
pp. 30-43
Author(s):  
M. I. Belovolov ◽  
S. O. Kozelskaya ◽  
O. N. Budadin ◽  
V. Yu. Kutyurin
Keyword(s):  
High Temperature ◽  
Hydrostatic Pressure ◽  
Pressure Range ◽  
Fiber Optic ◽  
Brillouin Scattering ◽  
Pressure Sensors ◽  
Fiber Bragg Gratings ◽  
Single Mode ◽  
Fabry Perot ◽  
Light Guides

An analytical review of physically possible methods and available achievements in registering hydrostatic pressure or mechanical stresses using fiber optic fibers and sensors based on them based on published works that can be used in harsh environmental conditions is carried out. The results of the review show that fully distributed or quasidistributed fiber-optic systems for recording hydrostatic pressure or mechanical stress can be implemented on the following physical principles and apparatus with measures to compensate or suppress the influence of temperature: polarizing sensors on birefringent single- mode light guides and OTDR equipment; micro-flexible sensors with OTDR equipment on conventional multimode fibers; measuring systems on fiber Bragg gratings; on discrete sensors, in particular, on sealed fiber Fabry–Perot interferometers; Brillouin distributed sensors on single-mode fibers that are not sensitive to temperature changes. It is shown that single-mode birefringent fibers with hollow holes in the shell and fiber Bragg gratings written in the core have a good linear sensitivity to hydrostatic pressure and a weak dependence on temperature. Lattices in phosphorous-containing single-mode light guides have increased high-temperature properties up to ~500 C and higher. A number of discrete fiber sensors’ structures and pressure recorders are investigated. Various structures of sensitive elements of pressure sensors on sealed fiber Fabry–Perot interferometers and fiber gratings in spherical and cylindrical small-sized cases are investigated. Sensors based on Fabry–Perot fiber interferometers soldered into a glass capillary and protected from water by external high-temperature hermetic coatings showed good linearity in the pressure range of 0…540 ATM at temperatures up to ~200 C. The sensors are efficient at temperatures up to 600 °C and are promising for use in severe and special external conditions. The possibility of compensating the temperature sensitivity by selecting external coatings is shown. Pressure sensors were tested on local areas with microbends and it was shown that they can measure pressures up to ~24 МPа at temperatures up to ~450 C, but to compensate for the dependence of the readings on temperature, it must be measured by an independent sensor. The possibility of independent and simultaneous measurement of hydrostatic pressure and temperature along a single fiber using spontaneous Brillouin scattering is shown. Pressure is measured by the frequency shift of Brillouin scattering, and temperature by its intensity. The operation of the Brillouin recorder in the pressure range 0…34 MРа is demonstrated. The pressure resolution was ~0,2 МРа. New methods are proposed for detecting Brillouin scattering – a heterodyne signal with a high signal-to-noise ratio and based on frequency modulation of a semiconductor single-frequency distributed feedback laser. The measurement range has been increased by more than 10 km and the coordinate resolution has been increased. The Brillouin scattering method is promising for creating distributed systems for measuring hydrostatic pressure or mechanical stress for severe physical conditions, including temperatures of ≥3000 C.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

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