3 edition of Noncontact measurement of high temperature using optical fiber sensors found in the catalog.
Noncontact measurement of high temperature using optical fiber sensors
Written in English
|Series||NASA-CR -- 186975., NASA contractor report -- NASA CR-186975.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
fiber-optic current sensor (FOCS) is a spin off from a sensor developed for high-voltage substations and opens totally new perspectives in the field of high current DC measurement. Fig. 1: Faraday effect. Fig. 2: Fiber-optic current sensor. Two slit and bar grids and optical fibers for lighting and reading are specially conceived to resist at high temperature (some hundreds of degrees Celsius) and constitute a fully optical moire setup, allowing measurement of displacement with a sensitivity of : Jean-Pierre Ebbeni.
Optical micrometers and fiber optic sensors .. 24 - 25 Color sensors for surfaces and self-luminous objects 26 - 27 IR temperature measurement IR temperature sensors .. 28 - 29 Thermal imaging cameras .. 30 - 31 Application-specific solutions Confocal chromatic sensors for high precision applications in restricted spaces. We propose an all-fiber-based dual-modal imaging system that combines noncontact photoacoustic tomography (PAT) and optical coherence tomography (OCT). The PAT remotely measures photoacoustic (PA) signals with a nm laser on the surface of a sample by utilizing a fiber interferometer as an ultrasound detector. The fiber-based OCT, employing a swept-source laser Cited by: 1.
A simple noncontact force sensor based on an optical fiber Bragg grating attached to a small magnet has been proposed and built. The sensor measures the force between the magnet and any ferromagnetic material placed within a few millimeters of the sensor. Maintaining the sensor at a constant standoff distance, material loss due to corrosion increases the distance between the magnet Cited by: To turn the FBG into a contactless force sensor, we attached a small, cylindrical magnet that was magnetized in the direction of its axis to the loose end of the optical fiber by a tiny hole in the center; therefore, the tip of the optical fiber could be inserted into the hole in the magnet and firmly glued using a low-viscosity adhesive (Loctite , Henkel, São Paulo, Brazil).Cited by:
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Noncontact measurement of high temperature using optical fiber sensors - NASA/ADS The primary goal of this research program was the investigation and application of noncontact temperature measurement techniques using optical techniques and optical fiber by: 1. The measurable temperature range of a fiberoptic temperature sensor using a thermal optical power-meter is from 30 to 70 °C.
It is expected that a noncontact temperature sensor using infrared optical fiber can be developed for medical and industrial usages based on the results of this by: 1.
Get this from a library. Noncontact measurement of high temperature using optical fiber sensors: final report.
[Richard O Claus; United States. National Aeronautics and Space Administration.]. These sensors use the concept that the frequency of light changes when light passes through an optical fiber, and the change depends on external effects (such as strain, vibration, impact shock, and supersonic waves).
The advantages of this method are that it can be used to measure high-temperature areas and can be used for a wide frequency by: Fiber-optic confocal sensors can be used for displacement [1,2] and velocity  measurement.
These sensors use a coaxial optical system of a single fiber and a lens system to image light onto an.
In this study, the Si substrate temperature in high-power pulse magnetron sputtering (HPPMS) was measured by a noncontact method based on optical low-coherence interferometry (LCI). The measurement was simultaneously performed using an LCI system and a thermocouple (TC) as a contact measurement by: 1.
Based on the results of this study, a noncontact temperature sensor using a silver halide optical fiber can be developed for the temperature measurement of the pH sample in the secondary water.
The method using strain gauges also is difficult to implement for objects that may be at a high temperature. Finally, the method using accelerometers requires users to have specialized knowledge for the modal analysis. On the other hand, another measurement technique using vibration sensors with optical fiber cables is available.
This Cited by: 7. To increase the amount of infrared radiation through the silver halide optical fiber and to the infrared sensors, optical devices such as an infrared collimator and a focusing lens are used.
The relationships between the temperatures of a heat source and the measured output signals are determined. The measurable temperature range of a fiber-optic temperature sensor is from 30 to.
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: Noncontact temperature measurement is the preferred technique for small, moving, or inaccessible objects; dynamic processes that require fast response; and temperatures (°F).
To select the best noncontact temperature measurement device for a particular application, it is essential to understand the basics of temperature measurement technology, temperature measurement parameters, and the features offered by the various measurement.
The complexity and challenges in noncontact temperature measurements inside microwave-heated catalytic reactors are presented in this paper. A custom-designed microwave cavity has been used to focus the microwave field on the catalyst and enable monitoring of the temperature field in 2D.
A methodology to study the temperature distribution in the catalytic bed by using a thermal camera in Cited by: Estimates of world-wide sales of temperature sensors run to approximately one billion dollars per year, a figure that could be increased several times when associated technology e.g.
the measurement system, is added. Fiber optic temperature sensors represent devices with the capability of operation in hazardous environments, or with inflammable Author: K. Grattan. The present paper shows the results of a new development in the field of industrial contactless temperature measurement typically in the range of K up to K.
Using fiber optics, the new sensor head has a small size matching the requirements for integration in demanding applications.
The sensor delivers an irradiance dependent signal of the targeted (metallic) surface under test. High Speed Temperature Detectors The OS series high speed industrial fiber optic infrared transmitters measure temperature ranges from to ºC ( to °F) using three standard optical fields of view and three standard fiber optic cable lengths.
This unit offers many standard features such as adjustable Emissivity, linear analog output, high and low alarm voltage output.
In this study, a method to measure vibration stress in a noncontact manner using optical displacement sensors is presented and validated. The proposed method estimates vibration-induced stress of small-bore piping directly using noncontact sensors based on a light-emission by: 2.
ventional sensors. High temperature processing operations in cement, refractory and chemical industries often use fiber optic temperature sensing. At some-what lesser temperatures, plastics processing, paper making and food processing operations are making more use of the technology. Fiber optics are also used in fusion, sput.
For Ge-doped fibers, the regeneration temperature is ° C and the wavelength shift with temperature has a non-negligible quadratic term. However, they exhibit minimal decay below ° C.
This technology opens up the possibility to extend realistic fiber-optic sensors to high-temperature. The optical fiber tip clearance measurement system consists of the reflective intensity-modulated optical fiber bundle (sensor), main signal processing unit, high-speed data acquisition card, and a computer.
The static performance and dynamic performance experiments were conducted to verify the performance of the system we by: 4. In this study, we have developed a non-contact temperature sensor using a silver halide optical fiber for medical endoscopic usage.
We have measured an infrared radiation which is transferred by a silver halide optical fiber from a heat source using a thermal optical power-meter and a thermopile sensor. To increase the amount of infrared radiation through the silver halide optical fiber and to.
However, researchers from Ohio State University, working with Luna’s OBRare developing a solution that could lead to sapphire fiber sensors for high temperature sensing. The researchers discovered that sapphire fiber can be cladded through the reaction of 6 3 Li(n,α) 1 3 H in a reactor.
High energy alpha particles and tritons slightly modify the index of refraction of sapphire in its .MTII offers advanced fiber-optic based measurement instruments and sensors for displacement, position and vibration applications.
With frequency response to kHz and resolution to Angstroms these fiber optic sensors are ideal for high performance measurement applications that require non-contact sensing technology.Abstract: Experiments were performed to test fiber optic temperature sensors under thermal conditions similar to those that would be experienced in the transient reactor test facility (TREAT) at the Idaho National Laboratory.
Specifically, four single-mode optical fiber sensors were dropped into a pre-heated furnace to simulate a step temperature transient, for steps from room temperature to Author: Kelly M. McCary, Brandon A. Wilson, Anthony Birri, Thomas E.