Centroid shift analysis of microlens array detector in interference imaging system

Zhu, Zhaopeng; Hui, Mei; Liu, Ming; Dong, Liquan; Liu, Xiaohua; Zhao, Yuejin

doi:10.1016/j.optcom.2015.05.049

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Next to morphological erosion, the features of the geometrical area and centroid vertical coordinate were extracted from the binary images. ,,, The area is the number of flame pixels related to the flame area. The centroid vertical coordinate is the vertical coordinate of the flame mass center.…”

Section: Methodsmentioning

confidence: 99%

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

et al. 2022

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The use of blast furnace gas (BFG) as a fuel provides an alternative for waste stream valorization in the steel industry, enhancing the sustainability and decarbonization of its processes. Nevertheless, the implementation of this solution on an industrial scale requires a continuous control of the combustion due to the low calorific value of BFG. This work analyzes the combustion behavior and monitoring of BFG/CH 4 blends in a laboratory premixed fuel burner. We evaluate several stable combustion conditions by burning different BFG/CH 4 mixtures at a constant power rate over a wide range of air/fuel equivalence ratios. In addition, relevant image features and chemiluminescence emission spectra have been extracted from flames, using advanced optical devices. BFG combustion causes an increase in CO 2 and CO emissions, since those fuels are the main fuel components of the mixture. On the other hand, NO x emissions decreased because of the low temperature of combustion of the BFG and its mixtures. Chemiluminescence shows that, in the case of CH 4 combustion, peaks associated with hydrocarbons are present, while during the substitution of CH 4 by BFG those peaks are attenuated. Image flame features extracted from both ultraviolet and visible bandwidths show a correlation with the fuel blend and air/fuel equivalence ratio. In the end, methodologies developed in this work have been proven to be valuable alternatives with a high potential for the monitoring and control of BFG cofiring for the steel industry.

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Section: Methodsmentioning

confidence: 99%

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

et al. 2022

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“…However, due to manufacturing deviations in the production process, the MLA surface parameters do not perfectly coincide with the design values, resulting in different local surface errors, such as coordinate distortion [ 15 ], curvature variation [ 16 ], centroid shift [ 33 , 34 , 35 ], or irregular deformation [ 36 ]. We develop three basic error models that contain pitch error, radius-of-curvature error and decenter error, according to the arrangement and geometric features of the MLA used in this paper.…”

Section: Modelsmentioning

confidence: 99%

Rectification of Images Distorted by Microlens Array Errors in Plenoptic Cameras

Zhu

Zhang

et al. 2018

Sensors

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A plenoptic cameras is a sensor that records the 4D light-field distribution of target scenes. The surface errors of a microlens array (MLA) can cause the degradation and distortion of the raw image captured by a plenoptic camera, resulting in the confusion or loss of light-field information. To address this issue, we propose a method for the local rectification of distorted images using white light-field images. The method consists of microlens center calibration, geometric rectification, and grayscale rectification. The scope of its application to different sized errors and the rectification accuracy of three basic surface errors, including the overall accuracy and the local accuracy, are analyzed through simulation of imaging experiments. The rectified images have a significant improvement in quality, demonstrating the provision of precise light-field data for reconstruction of real objects.

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“…Additionally, due to the introduction of marker molecules, it is possible for the structure and activity of the biological molecules to be affected and changed, usually making the test results difficult to demonstrate the interaction of biological molecules and the authenticity of the characteristics [ 7 , 8 ]. Based on the aforementioned reasons, the non-mark detection technology has gradually become an important development direction in the field of biological analysis in recent years [ 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Parallel Detection of Refractive Index Changes in a Porous Silicon Microarray Based on Digital Images

Jia

et al. 2017

Sensors

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A new technique for the refractive index change with high-sensitivity measurements was proposed by the digital image of porous silicon (PSi) microarray utilization in this paper. Under the irradiation of a He-Ne laser, the surface images of the PSi array cells with the microcavity structure were obtained by the digital imaging equipment, whereas the refractive index change of each array cells was detected by calculating the average gray value of the image and the refractive index change measurement sensitivity was 10−4 order of magnitude. This technique could be utilized in the label-free and parallel detection of refraction index changes induced by a biological reaction in the microarray or the chip.

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Centroid shift analysis of microlens array detector in interference imaging system

Cited by 8 publications

References 13 publications

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

Optical Analysis of Blast Furnace Gas Combustion in a Laboratory Premixed Burner

Rectification of Images Distorted by Microlens Array Errors in Plenoptic Cameras

Parallel Detection of Refractive Index Changes in a Porous Silicon Microarray Based on Digital Images

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