Structured light-field focusing for flowfield diagnostics

Ahmed, Kareem A.; Wiley, Alex

doi:10.1016/j.expthermflusci.2017.08.003

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…Figure 1 shows the focusing schlieren system used in this work [34]. The optical system contains a source grid (F-G), a schlieren lens (D), a cutoff grid (C) and a digital camera (A-B).…”

Section: The Focusing Schlieren Methods Base On An Off-axis Circulamentioning

confidence: 99%

“…The system allows to have a Field Of View ( FOV ) of 17.4 × 9.2 mm 2 . The DOF of the focusing-schlieren system for one source [34] is written as follows DOF=2dof2cf#(do−f)f4−c2f#2(do−f)2 where c is the confusion circle, f # = f / d and f and d are the focal distance and diameter of the schlieren lens respectively. The modified f - number for an off-axis source can be expressed as:f#=fd+(2⋅OS) where OS is the off-axis distance from the axis of the optical system to a source of the source grid.…”

Section: The Focusing Schlieren Methods Base On An Off-axis Circulamentioning

confidence: 99%

“…In another approach, a light source illuminating a source grid and a Fresnel lens were used to improve the method [32,33]. In a recent research, a structured light-field focusing technique was proposed to visualize fluid flows [34]. This approach stems for using light-field physics and multiple light sources to generate two-dimensional planar focused images.…”

Section: Introductionmentioning

confidence: 99%

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Temperature Measurement of Fluid Flows by Using a Focusing Schlieren Method

Martínez-González

Moreno-Hernández

Guerrero-Viramontes

et al. 2018

Sensors

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A method for measuring planar temperature fields of fluid flows is proposed. The focusing schlieren technique together with a calibration procedure to fulfill such a purpose is used. The focusing schlieren technique uses an off-axis circular illumination to reduce the depth of focus of the optical system. The calibration procedure is based on the relation of the intensity level of each pixel of a focused schlieren image to the corresponding cutoff grid position measured at the exit focal plane of the schlieren lens. The method is applied to measure planar temperature fields of the hot air issuing from a 10 mm diameter nozzle of a commercial Hot Air Gun Soldering Station Welding. Our tests are carried out at different temperature values and different planes along the radial position of the nozzle of the hot air. The experimental values of temperature measurements are in agree with those measured using a thermocouple.

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“…Figure 1 shows the focusing schlieren system used in this work [34]. The optical system contains a source grid (F-G), a schlieren lens (D), a cutoff grid (C) and a digital camera (A-B).…”

Section: The Focusing Schlieren Methods Base On An Off-axis Circulamentioning

confidence: 99%

Section: The Focusing Schlieren Methods Base On An Off-axis Circulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Measurement of Fluid Flows by Using a Focusing Schlieren Method

Martínez-González

Moreno-Hernández

Guerrero-Viramontes

et al. 2018

Sensors

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show abstract

“…In figure 1 is shown the focusing schlieren system used in this work [30]. the digital camera (A) by using a lens (B-f# = 1.7) with a fixed focal length of 128 mm and a diameter of 75 mm.…”

Section: The Focusing Schlieren Methods Base On An Off-axis Circular Imentioning

confidence: 99%

“…In another approach, a light source that illuminates a source grid and a Fresnel lens was used to improve the method [28,29]. In a recently research, a structured light-field focusing technique was proposed to visualize fluids flow [30]. This approach stems for using light-field physics and multiple light sources to generate two-dimensional planar focused images.…”

Section: Of 13mentioning

confidence: 99%

Temperature Measurement of Fluids Flow by Using a Focusing Schlieren Method

Martínez-González¹,

Moreno-Hernández²,

Guerrero-Viramontes³

et al. 2018

Preprint

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In this work, we propose a method to measure planar temperature fields of fluids flow. We used a focusing schlieren technique together with a calibration procedure to fulfill such purpose. The focusing schlieren technique uses an off-axis circular illumination to reduce the depth of focus of the optical system. The calibration procedure is based on the relation of the intensity level of each pixel of a focused schlieren image to the corresponding cutoff grid position measured at the exit focal plane of the schlieren lens.  The method is applied to measure planar temperature fields of the hot air issuing from a 10 mm diameter nozzle of a commercial Hot Air Gun Soldering Station Welding. Our tests are carried out at different temperature values and different planes along the radial position of the nozzle of the Hot Air Gun Soldering Station Welding. The temperature values obtained experimentally are in agreed with those obtained with a thermocouple.

show abstract