Multiangular Absorption Diagnostics of a Turbulent Argon-Methane Jet

Emmerman, P. J.; Goulard, R.; Santoro, Robert J.; Semerjian, Hratch G.

doi:10.2514/3.62462

Cited by 93 publications

(18 citation statements)

References 20 publications

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“…III, reconstruction errors in the low E-field areas of the phase difference map are amplified when they are inverted to E-field values using Eq. (3) due to the square root dependence of E on 5. This is easily observed in Figs.…”

Section: Measurement Accuracysupporting

confidence: 55%

Kerr effect tomography for nonintrusive spatially resolved measurements of asymmetric electric field distributions

Hertz

1986

Appl. Opt.

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Section: Measurement Accuracysupporting

confidence: 55%

Kerr effect tomography for nonintrusive spatially resolved measurements of asymmetric electric field distributions

Hertz

1986

Appl. Opt.

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“…Compared with previous work on absorption-based tomography, the HT technique exploits the spectral information at a large number of absorption transitions whereas previous work relied on spectral information at a limited number of transitions (typically one or two) [12][13][14][15][16]. Hence, the HT technique essentially adds wavelength as a new dimension to the traditional tomography problem, which primarily focused on the use of spatial information [17].…”

Section: Background Of Hyperspectral Tomographymentioning

confidence: 99%

50-kHz-rate 2D imaging of temperature and H_2O concentration at the exhaust plane of a J85 engine using hyperspectral tomography

Ma¹,

Li²,

Sanders³

et al. 2013

Opt. Express

188

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This paper describes a novel laser diagnostic and its demonstration in a practical aero-propulsion engine (General Electric J85). The diagnostic technique, named hyperspectral tomography (HT), enables simultaneous 2-dimensional (2D) imaging of temperature and water-vapor concentration at 225 spatial grid points with a temporal response up to 50 kHz. To our knowledge, this is the first time that such sensing capabilities have been reported. This paper introduces the principles of the HT techniques, reports its operation and application in a J85 engine, and discusses its perspective for the study of high-speed reactive flows.

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“…On the other hand, in recent years remarkable progress has been made in the technology for CT (Computed Tomography), (7)- (10) which is an image data processing method performed by converting several one-dimensional image data obtained from multidirectional projection into a two-dimensional image using a computer algorithm. Therefore, we apply the CT technique to inverse-identification of pressure distribution based on the information from around a tactile sensor.…”

Section: Introductionmentioning

confidence: 99%

Sensing Characteristics of an Experimental CT Tactile Sensor

Sawamoto¹,

Ohka

Zhu

2008

JAMDSM

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The CT (Computed tomography) method is very effective for making thinner optical waveguide-type tactile sensors. In a previous paper, the authors established the architecture of a CT tactile sensor and evaluated its principle using a series of computer simulations. As a result, the LU decomposition method showed better noise robustness compared to the ART method. On the basis of the simulations, we develop an experimental CT tactile sensor comprised of infrared diodes, phototransistors, an acrylic plate and a black rubber sheet. In the present study, the LU decomposition method is employed and we determine the validity of the algorithm by examining use of a loading machine produced for the CT tactile sensor. In a series of experiments, it is found that absorption of light intensity increases monotonically with increase of applied force and that the present reconstruction method can be applied to not only simply but also multiply connected contact domains. The estimated position of the pressure centroid possesses a rather large error of 4.9 mm, which is 10.8% of a segment of the sensing area.

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Multiangular Absorption Diagnostics of a Turbulent Argon-Methane Jet

Cited by 93 publications

References 20 publications

Kerr effect tomography for nonintrusive spatially resolved measurements of asymmetric electric field distributions

Kerr effect tomography for nonintrusive spatially resolved measurements of asymmetric electric field distributions

50-kHz-rate 2D imaging of temperature and H_2O concentration at the exhaust plane of a J85 engine using hyperspectral tomography

Sensing Characteristics of an Experimental CT Tactile Sensor

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