Pub Date : 2024-11-15Epub Date: 2024-10-31DOI: 10.1364/OPTCON.534029
Joshua Eger, Mark Bailly, Jennifer Blain Christen
The proposed photoluminescence calibration standard comprises a solid-state phosphor film, neutral density gel filter(s), and a 3D-printed optomechanical cartridge. The proposed standard demonstrated exceptional photostability; photoluminescence did not deviate from the baseline more than 1.27% under 5 minutes of continuous illumination. Remarkably, there was no measurable degradation over a 3-year study. Precise photoluminescence intensity modulation was accomplished with neutral density gel filters (R2 > 0.9982) and optical apertures (R2 > 0.9970). A model for photoluminescence intensity as a function of neutral-density filter and optical aperture parameters yielded a mean percentage error (MPE) of 2.79%, indicating high precision. Inter-sample variability was low, with a mean coefficient of variation (CV) of 1.32%. Mean CV across 24 channels decreased from 11.88% to 1.51% following multi-point calibration of multichannel point-of-care (POC) fluorometers. Cost analysis revealed a per-unit cost between $0.49 to $1.80. This work suggests that the proposed calibration standards provide a cost-effective, highly stable solution for reliable fluorometer calibration in low-resource settings.
{"title":"Simple, cost-effective, highly stable solid-state photoluminescence standard for fluorometer calibration in low-resource settings.","authors":"Joshua Eger, Mark Bailly, Jennifer Blain Christen","doi":"10.1364/OPTCON.534029","DOIUrl":"10.1364/OPTCON.534029","url":null,"abstract":"<p><p>The proposed photoluminescence calibration standard comprises a solid-state phosphor film, neutral density gel filter(s), and a 3D-printed optomechanical cartridge. The proposed standard demonstrated exceptional photostability; photoluminescence did not deviate from the baseline more than 1.27% under 5 minutes of continuous illumination. Remarkably, there was no measurable degradation over a 3-year study. Precise photoluminescence intensity modulation was accomplished with neutral density gel filters (R<sup>2</sup> > 0.9982) and optical apertures (R<sup>2</sup> > 0.9970). A model for photoluminescence intensity as a function of neutral-density filter and optical aperture parameters yielded a mean percentage error (MPE) of 2.79%, indicating high precision. Inter-sample variability was low, with a mean coefficient of variation (CV) of 1.32%. Mean CV across 24 channels decreased from 11.88% to 1.51% following multi-point calibration of multichannel point-of-care (POC) fluorometers. Cost analysis revealed a per-unit cost between $0.49 to $1.80. This work suggests that the proposed calibration standards provide a cost-effective, highly stable solution for reliable fluorometer calibration in low-resource settings.</p>","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"3 11","pages":"2060-2077"},"PeriodicalIF":1.1,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11844768/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143484928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15Epub Date: 2024-04-16DOI: 10.1364/OPTCON.525065
Gastón A Ayubi, Bartlomiej Kowalski, Alfredo Dubra
The normalized cross-correlation ( ) is widely used for image registration due to its simple geometrical interpretation and being feature-agnostic. Here, after reviewing definitions for images with an arbitrary number of dimensions and channels, we propose a generalization in which each pixel value of each channel can be individually weighted using real non-negative numbers. This generalized normalized weighted cross-correlation ( ) and its zero-mean equivalent ( ) can be used, for example, to prioritize pixels based on signal-to-noise ratio. Like a previously defined with binary weights, the proposed generalizations enable the registration of uniformly, but not necessarily isotropically, sampled images with irregular boundaries and/or sparse sampling. All definitions discussed here are provided with discrete Fourier transform ( ) formulations for fast computation. Practical aspects of computational implementation are briefly discussed, and a convenient function to calculate the overlap of uniformly, but not necessarily isotropically, sampled images with irregular boundaries and/or sparse sampling is introduced, together with its formulation. Finally, examples illustrate the benefit of the proposed normalized cross-correlation functions.
归一化互相关（ncc - C）因其几何解释简单、特征不确定而被广泛应用于图像配准。这里，在回顾了具有任意数量维度和通道的图像的ncc定义之后，我们提出了一种概化方法，其中每个通道的每个像素值可以使用实数非负数单独加权。例如，这种广义归一化加权互相关（N W C C）及其零均值当量（Z N W C C）可用于根据信噪比对像素进行优先排序。就像之前定义的具有二元权值的nwcc一样，所提出的概化方法可以对具有不规则边界和/或稀疏采样的均匀（但不一定是各向同性）采样图像进行配准。这里讨论的所有nc定义都提供了用于快速计算的离散傅里叶变换（dft）公式。简要讨论了ncc计算实现的实际方面，并介绍了一个方便的函数来计算具有不规则边界和/或稀疏采样的均匀但不一定是各向同性的采样图像的重叠，以及它的D - F - T公式。最后，举例说明了所提出的归一化互相关函数的好处。
{"title":"Normalized weighted cross correlation for multi-channel image registration.","authors":"Gastón A Ayubi, Bartlomiej Kowalski, Alfredo Dubra","doi":"10.1364/OPTCON.525065","DOIUrl":"10.1364/OPTCON.525065","url":null,"abstract":"<p><p>The normalized cross-correlation ( <math><mi>N</mi> <mi>C</mi> <mi>C</mi></math> ) is widely used for image registration due to its simple geometrical interpretation and being feature-agnostic. Here, after reviewing <math><mi>N</mi> <mi>C</mi> <mi>C</mi></math> definitions for images with an arbitrary number of dimensions and channels, we propose a generalization in which each pixel value of each channel can be individually weighted using real non-negative numbers. This generalized normalized weighted cross-correlation ( <math><mi>N</mi> <mi>W</mi> <mi>C</mi> <mi>C</mi></math> ) and its zero-mean equivalent ( <math><mi>Z</mi> <mi>N</mi> <mi>W</mi> <mi>C</mi> <mi>C</mi></math> ) can be used, for example, to prioritize pixels based on signal-to-noise ratio. Like a previously defined <math><mi>N</mi> <mi>W</mi> <mi>C</mi> <mi>C</mi></math> with binary weights, the proposed generalizations enable the registration of uniformly, but not necessarily isotropically, sampled images with irregular boundaries and/or sparse sampling. All <math><mi>N</mi> <mi>C</mi> <mi>C</mi></math> definitions discussed here are provided with discrete Fourier transform ( <math><mi>D</mi> <mi>F</mi> <mi>T</mi></math> ) formulations for fast computation. Practical aspects of <math><mi>N</mi> <mi>C</mi> <mi>C</mi></math> computational implementation are briefly discussed, and a convenient function to calculate the overlap of uniformly, but not necessarily isotropically, sampled images with irregular boundaries and/or sparse sampling is introduced, together with its <math><mi>D</mi> <mi>F</mi> <mi>T</mi></math> formulation. Finally, examples illustrate the benefit of the proposed normalized cross-correlation functions.</p>","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"3 5","pages":"649-665"},"PeriodicalIF":1.4,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12448653/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145115142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ali Dehghanian, Mohsen Haghighat, Thomas Darcie, Levi Smith
{"title":"Demonstration of a Terahertz Integrated PlanarNetwork Synthesis Filter","authors":"Ali Dehghanian, Mohsen Haghighat, Thomas Darcie, Levi Smith","doi":"10.1364/optcon.505492","DOIUrl":"https://doi.org/10.1364/optcon.505492","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"48 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tengfei Sun, Shaoying Ke, Wentao Sui, Wenhao Zhang, Peng Lu, Dongfeng Qi, Bing Yang, Juan Wei, Y. Wu, Hongyu Zheng
{"title":"Feasibility of simultaneous multi-element analysis of quartz sand with impurities by calibration-free laser-induced breakdown spectroscopy and its potential for guiding glass manufacturing","authors":"Tengfei Sun, Shaoying Ke, Wentao Sui, Wenhao Zhang, Peng Lu, Dongfeng Qi, Bing Yang, Juan Wei, Y. Wu, Hongyu Zheng","doi":"10.1364/optcon.513626","DOIUrl":"https://doi.org/10.1364/optcon.513626","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"243 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139170303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Krypton tagging velocimetry in the plume of a plasma hollow cathode","authors":"Jacob Gottfried, A. Yalin","doi":"10.1364/optcon.503138","DOIUrl":"https://doi.org/10.1364/optcon.503138","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"32 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139002743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Katharina Goth, Madeleine Eitner, M. Griesbeck, Marius Rupp, D. Lorenz, Johannes Deutsch, Marc Eichhorn, C. Kieleck
{"title":"Beam quality improvement in a linear ZPG OPOpumped by a Q-switched compact high-powerHo³+:YAG laser","authors":"Katharina Goth, Madeleine Eitner, M. Griesbeck, Marius Rupp, D. Lorenz, Johannes Deutsch, Marc Eichhorn, C. Kieleck","doi":"10.1364/optcon.505473","DOIUrl":"https://doi.org/10.1364/optcon.505473","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"72 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138979037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Y. Tokizane, Shota Okada, Takumi Kikuhara, H. Kishikawa, Y. Okamura, Yoshihiro Makimoto, K. Nishimoto, T. Minamikawa, Eiji Hase, Junichi Fujikata, Masanobu Haraguchi, A. Kanno, S. Hisatake, N. Kuse, Takeshi Yasui
{"title":"Wireless data transmission in the 560-GHz band utilizing terahertz wave generated through photomixing of a pair of distributed feedback lasers injection-locking to a Kerr micro-resonator soliton comb","authors":"Y. Tokizane, Shota Okada, Takumi Kikuhara, H. Kishikawa, Y. Okamura, Yoshihiro Makimoto, K. Nishimoto, T. Minamikawa, Eiji Hase, Junichi Fujikata, Masanobu Haraguchi, A. Kanno, S. Hisatake, N. Kuse, Takeshi Yasui","doi":"10.1364/optcon.504431","DOIUrl":"https://doi.org/10.1364/optcon.504431","url":null,"abstract":"","PeriodicalId":74366,"journal":{"name":"Optics continuum","volume":"106 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138590585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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