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|Other titles||Two dimensional high temperature optical strain ...|
|Statement||Christian T. Lant.|
|Series||NASA contractor report -- 185116., NASA contractor report -- NASA CR-185116.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Download Two-dimensional high temperature optical strain measurement system.
Multiphase effort in developing an optical strain measurement system capable of mapping in two dimensions the strain on the surface of a hot specimen. The objective of this Phase I1 work has been to provide a noncontact, two- dimensional differential strain gauge for use in a high temperature experi- mental test faci 1 i ty.
The optical strain measurement system. The book is a valuable resource for experts and nonexperts alike. To the latter, it provides a comprehensive introduction; to the former, it serves as an up-to-date reference source summarizing the current state-of-the-art.
In short, it is poised to become the standard text in two-dimensional optical spectroscopy.5/5(1). Get this from a library. Two-dimensional high temperature optical strain measurement system.
Phase II. [Christian T Lant; United States. National Aeronautics and Space Administration.]. A laser speckle strain measurement system with two-dimensional measurement capabilities has been built and tested for high temperature applications.
The 1st and 2nd principle strains at a point on a specimen are calculated from three components of one-dimensional strain. Strain and Temperature Measurement with Fiber Optic Sensors FROM THE AUTHORS' PREFACESensors operating on interferometric principles and mounted inside optical fibers have recently been considered for measuring strain and temperature.
Indeed, such sensors have successfully been employed for measuring pressure or temperature in fluids. High temperature strain measuring devices with initial gauge lengths of less than 2mm are not widely used, and the choice of suitable sensors worldwide is extremely limited.
In the C-FAT project, significant effort was initially required to develop effective application practices for the selected pecker gauges.
This paper focused on the application of two dimensional temperature measurement method based on the combination of computed tomography and tunable diode laser absorption spectroscopy using absorption spectra of water vapor at nm and nm for each laser scanning using direct absorption spectroscopy, which show the better characteristics Author: Zhenzhen Wang, Zhenzhen Wang, Takahiro Kamimoto, Yoshihiro Deguchi, Yoshihiro Deguchi, Wangzheng Zho.
A related optical system for microscopic observation and strain measurement at high temperature using DIC principles was developed . The system consists of a ultra-violet (UV) CCD camera, UV.
High temperature mechanical testing of ultra high temperature materials, such as monolithic ceramics, ceramic matrix composites, and carbon — carbon composites, can be a very difficult task. Many factors will influence the success or failure of the test, including the mechanical test system, heating system, gripping system, testpiece design.
Introduction. Distributed optical fiber strain sensing can provide real-time strain information along a region of interest with low-cost Two-dimensional high temperature optical strain measurement system. book fiber, offering advantages such as immunity from electro-magnetic interference, electrical isolation, and multiplexing possibilities.
1, 2 Froggatt et al. 3 presented a method to achieve high-sensitivity high-spatial-resolution distributed strain Author: Yamei Guo, Zhenyang Ding, Kun Liu, Junfeng Jiang, Chenhuan Wang, Tiegen Liu.
Optical imaging of strain in two-dimensional crystals Article (PDF Available) in Nature Communications 9(1) December with Reads How we measure 'reads'. Strain engineering is widely used in material science to tune the (opto-)electronic properties of materials and enhance the performance of devices.
Two Cited by: 1. Introduction. With the development of aerospace engineering, more and more materials need to serve in high temperature environment. In order to accurately characterize the mechanical behavior of materials at high temperatures, a lot of high temperature strain measurement methods have been developed in recent decades, among which digital image correlation (DIC) Cited by: 9.
A method of measuring strain over cm intervals to an accuracy of 10 microstrain in unaltered low-loss communications-grade single-mode optical fiber is presented.
The method uses a tunable external cavity diode laser to measure the reflected intensity of a reflector–fiber system as a function of wavelength. This measurement is performed with no strain applied to the.
Optical fiber thermometry technology for high-temperature measurement is briefly reviewed in this paper. The principles, characteristics, recent progresses and advantages of the technology are described.
Examples of using the technology are introduced. Many blackbody, infrared, and fluorescence optical thermometers are developed for practical by: A high magnification UV lens for high temperature optical strain measurements Article in Review of Scientific Instruments 90(4) April.
ing this optical strain measurement system for the Lewis Research Center. The design of the optical strain gauge is based on the speckle shift method of Ichirou Yamaguchil at The Institute of Physical and Chemical Research, Japan. Laser speckle is a phase effect caused by the diffuse reflec-Author: Christian T.
Lant, Walid Qaqish. Variables strain measurement systems are available with variating properties for accuracy, registration mode or a working range. An enhancement of widespread photogrammetric and electrical strain measurement systems are fiber optical strain (FOS) gauges like the FBG sensors.
The benefits of FOS strain. The strain gauge has become an essential tool in stress analysis, part optimization, safety testing and technical investigative work. It is also a major component used in the manufacturing of measurement transducers.
Get a complete overview of the topic of " An Introduction into Measurements using Strain Gauges " - in Karl Hofmann's #1. Optical strain measurement is a strain measurement method based on digital image processing.
The method is a non-contact measurement technique, which alleviates the need for modifying the parts for lead-wire routing and sensor attachment as required in traditional strain gage instrumentation.
High-temperature digital image correlation method for full-field deformation measurement at \deg C Bing Pan, Dafang Wu, Zhaoyang Wang et al.-Internal displacement and strain measurement using digital volume correlation: a least-squares framework Bing Pan, Dafang Wu and Zhaoyang Wang-Recent citations Determination of Mechanical Properties ofCited by: Abstract.
The major goal of the work presented is to develop test methodologies for small strain measurement tasks. The implementation is especially driven by the pontential of novel optical strain field measurement systems, a pattern correlation system and an electronic speckle pattern interferometer (ESPI).Author: R.
Steinberger, M. Jerabek, Z. Major, R. Lang. point, that the high temperature apparent strain, is lower and closer to the starting value (fig. It does not correct for TCE differences. This results in apparent strain compensation at room temperature and at high temperature.
However, there is still significant apparent strain variation between the room temperature and maximum use. Strain Gage: Materials material gage factor, G TCR () Ni80 Cr20 - 10 Pt92 W8 – 24 Silicon (n type) to 70 to Germanium (p type) TCR = temperature coefficient of resistivity (ºC-1) • Note: • G for semiconductor materials ~ x that of metalsFile Size: 1MB.
The measurement of quasi-static strain field using optical fibers presents a considerable challenge due to the inherent sensitivity of optical fibers to temperature.
This paper summarizes recent work we have carried out on two approaches to this problem. Measuring the Two-Dimensional Temperature Profile of Carbon Fiber Reinforced Polymers During Drilling Using Distributed Fiber Sensing Article (PDF Available) in Journal of Lightwave Technology PP.
NASA Contractor Report Optical Strain Measuring Techniques for High Temperature Tensile Testing 4 &AS A-CB- 17 9 6 37) N 8 7- 2 63 27 3ECHVIQUZS POB filEH IEFPEBAIEEE 'IEISE SES'IIIG (Cleveland State liciv.) 55 p Avail: NTIS RC AC41L1E SO1 CSCL Unclas OPT 1C AL SIS 11 ti R E ASU BX N C 63/35 00S79t8 John yesi and John H.
HemannFile Size: 2MB. This article provides an instruction on how to install and use the 1-LB/ZW strain gauge from HBM. This type of strain gauge allows the measurement of axial load on bolt elements.
Wiring of a Bolt Strain Gauge. It is difficult to bond a strain gauge to a bolt while measuring the tightening stress. Normally, this requires the use of heavy. We developed an advanced video extensometer for non-contact, real-time, high-accuracy strain measurement in material testing.
In the established video extensometer, a near perfect and ultra-stable imaging system, combining the idea of active imaging with a high-quality bilateral telecentric lens, is constructed to acquire high-fidelity video images of the test Cited by: The temperature cross-sensitivity is a sensor measurement drift caused by temperature variation.
It is the strain that is wrongly measured when there is a change of 1ºC (or 1ºK) in temperature. The value is given in (µm/m)/ºC [or (µm/m)/ºK] and can be used to compensate the effect of temperature on the optical strain sensor (not. A new technique for measuring strain at temperatures from room temperature to at least K has been developed and evaluated.
The system was developed for measuring strain during studies of the short-time (seconds to minutes), high-temperature mechanical properties of materials heated by self resistance, but it has general applicability.
The technique Cited by: 3. An important branch of experimental stress analysis is based on the principle of strain measurement. At first cumbersome mechanical devices were used for strain measurement, which dis-played the strain using a lever ratio of one.
Sears et al., “Measurement of Discrete Strain Change in a High-Fiber Count Slotted-Core Ribbon Cable Using Bragg Gratings,” Proceedings of.
Strain engineering is an essential tool for modifying local electronic properties in silicon-based electronics. Here, Ahn et al. demonstrate control of biaxial strain Cited by: (1) 3D-DSPI measuring system provides a full-field strain/stress distribution with non-contact method.
It has a high spatial resolution and is well suited to capture true peak strain in high strain gradient areas. Fig. 6 shows a comparison of strain measurement by 3D-DSPI and by strain gauges on a tensile test of fiber reinforced plastic specimen.
Optical Strain Gauge for High Temperature Plastic Deformation Measurement. Rizzi L.M., Delvò P., Ghia S., Gramatica P. () Optical Strain Gauge for High Temperature Plastic Deformation Measurement.
In: Thompson D.O., Chimenti D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Author: L. Rizzi, P. Delvò, S.
Ghia, P. Gramatica. Hovis et al. () adopted the simplicity of the geometric approach concept and developed a compact instrument for strain measurement in a variety of environment. In their work, Microsoft Visual C++ software was used to load pairs of images manually and the strain values were determined successfully.
A fiber Bragg grating has unique characteristics to perform as a sensor. For example, when the fiber is stretched or compressed, the FBG will measure strain.
This happens essentially because the deformation of the optical fiber leads to a change in the period of the microstructure and, consequently, of the Bragg wavelength. There is also some. Frequency based Brillouin method can provide rapid strain/temperature sensing [87,88]. BOFDR can be employed to measure strain/temperature variations as small as 1 °C or 20 µε with few centimeters of resolution [88,89,90].
For BOFDR based long distance measurements single-mode fibers are used [89,91].Cited by: FOR THE ADVANCED ONE--DIMENSIONAL HIGH TEMPERATURE OPTICAL STRAIN MEASUREMENT SYSTEM - Phase HI Christian T. Lant Sverdrup Technology, Inc. NASA Lewis Research Center Group Brook Park, Ohio SUMMARY The Instrumentation and Control Techno-logy Division is developing optical strain measurement systems for applications usin.g high temperature.
Photoelasticity describes changes in the optical properties of a material under mechanical deformation. It is a property of all dielectric media and is often used to experimentally determine the stress distribution in a material, where it gives a picture of stress distributions around discontinuities in materials.
Photoelastic experiments (also informally referred to as .Room temperature ferroelectric thin films are the key element of high-density nonvolatile memories in modern electronics. However, with the further miniaturization of the electronic devices beyond the Moore's law, conventional ferroelectrics suffer great challenge arising from the critical thickness effect, where the ferroelectricity is unstable if the film thickness is reduced Cited by: 1.The OTM system is a rugged, stand alone, non-contact thermometer designed for measuring the temperature of hot gases.
The system utilizes a two color pyrometric technique to measure the temperature of hot gases with a temperature measurement range of to o C or to o F.
It can be used for any kind of hot gases and is not.