Processing schlieren-background patterns by constructing the direction field

Popova, E. M.

doi:10.1364/jot.71.000572

Cited by 15 publications

(5 citation statements)

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“…The dynamic range of the technique for most of the applications is of the order of 50:1, and the measurement error has been found to be in the order of 2-3 % percent of the full scale (Elsinga et al 2004;Hargather and Settles 2012;Vinnichenko et al 2012). Other authors (Popova (2004), Popova et al 2008;Gojani and Obayashi 2012;Gojani et al 2013;Yevtikhiyeva et al 2009) investigated the influence of various parameters on the measurement sensitivity and resolution of BOS analytically and experimentally and presented several guiding formulae for setting up a BOS system. A large number of papers have been published on methods suitable for a general improvement of accuracy and resolution of BOS.…”

Section: Accuracy Of Bosmentioning

confidence: 99%

Background-oriented schlieren (BOS) techniques

2015

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Section: Accuracy Of Bosmentioning

confidence: 99%

Background-oriented schlieren (BOS) techniques

2015

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“…This method has been improved to face different types of problems in science and engineering [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. Even though initially it was used as a visualization method, it has been used to quantify temperature data in fluid flows [8,9,10,11,12,13,14,15,16]. Nowadays different variant of the optical system has been implemented such as color schlieren [10,11,12], background oriented schlieren [13,14] and calibration schlieren [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Even though initially it was used as a visualization method, it has been used to quantify temperature data in fluid flows [8,9,10,11,12,13,14,15,16]. Nowadays different variant of the optical system has been implemented such as color schlieren [10,11,12], background oriented schlieren [13,14] and calibration schlieren [15,16]. This method has allowed to measure simultaneously temperature and velocity in fluid flows [19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

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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“…Although the schlieren technique was primarily conceived as a visualization method, it has also been used to obtain quantitative temperature data in fluids flow [8][9][10][11][12][13][14][15][16]. Consequently, some of the approaches proposed to accomplish such a purpose are: color schlieren [10][11][12], background oriented schlieren [13,14] and calibration schlieren [15,16]. In addition, the technique has been extended to measure simultaneously temperature and velocity in fluids flow [19][20][21][22].…”

Section: Introductionmentioning

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.

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Processing schlieren-background patterns by constructing the direction field

Cited by 15 publications

References 0 publications

Background-oriented schlieren (BOS) techniques

Background-oriented schlieren (BOS) techniques

Temperature Measurement of Fluid Flows by Using a Focusing Schlieren Method

Temperature Measurement of Fluids Flow by Using a Focusing Schlieren Method

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