Pub Date : 2024-11-04DOI: 10.1016/j.optlaseng.2024.108613
Zaoxin Chen , Juncheng Chen , Jiayu Chen , Jiapeng Cai , Tairan Huang , Dajiang Lu , Xiang Peng , Wenqi He
Since all the secrets are buried in the secret key, securely storing the secret keys plays a significant role in our modern information society. To avoid the risk of illegally duplicating the stored secret keys, Pappu et al. (Science 297, 2002) proposed an alternative strategy to authenticate a legal user, but not encrypt anything, by introducing a high security-level physical identity token which is well-known as the Physical Unclonable Function (PUF). However, it is incapable of keeping the already existing digital keys away from being duplicated. Here, by modifying the Wavefront Shaping (WS) technique, we present an idea to build a mapping relationship between any easy-to-duplicate digital key and an unclonable scattering media (e.g. ground glass) that is full of uncountable microparticles, and we named it the Unclonable Equivalent Key (UEK). Theoretical analysis and optical experiments were carried out to demonstrate its feasibility, especially its secure and robust performance assisted by an easy-to-implement alignment strategy.
{"title":"Highly-secure scattering-media-based key storage","authors":"Zaoxin Chen , Juncheng Chen , Jiayu Chen , Jiapeng Cai , Tairan Huang , Dajiang Lu , Xiang Peng , Wenqi He","doi":"10.1016/j.optlaseng.2024.108613","DOIUrl":"10.1016/j.optlaseng.2024.108613","url":null,"abstract":"<div><div>Since all the secrets are buried in the secret key, securely storing the secret keys plays a significant role in our modern information society. To avoid the risk of illegally duplicating the stored secret keys, Pappu <em>et al</em>. (Science 297, 2002) proposed an alternative strategy to authenticate a legal user, but not encrypt anything, by introducing a high security-level physical identity token which is well-known as the Physical Unclonable Function (PUF). However, it is incapable of keeping the already existing digital keys away from being duplicated. Here, by modifying the Wavefront Shaping (WS) technique, we present an idea to build a mapping relationship between any easy-to-duplicate digital key and an unclonable scattering media (e.g. ground glass) that is full of uncountable microparticles, and we named it the Unclonable Equivalent Key (UEK). Theoretical analysis and optical experiments were carried out to demonstrate its feasibility, especially its secure and robust performance assisted by an easy-to-implement alignment strategy.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108613"},"PeriodicalIF":3.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Light field depth estimation is crucial for various applications, but current algorithms often falter when dealing with complex textures and edges. To address this, we propose a light field depth estimation network based on multi-scale fusion and channel attention (LFMCNet). It incorporates a convolutional multi-scale fusion module to enhance feature extraction and utilizes a channel attention mechanism to refine depth map accuracy. Additionally, LFMCNet integrates the Transformer Feature Fusion Module (TFFM) and Channel Attention-Based Perspective Fusion (CAPF) module for improved occlusion refinement, effectively handling challenges in occluded regions. Testing on the 4D HCI and real-world datasets demonstrates that LFMCNet significantly reduces the Bad Pixel (BP) rate and Mean Square Error (MSE).
{"title":"Enhanced light field depth estimation through occlusion refinement and feature fusion","authors":"Yuxuan Gao , Haiwei Zhang , Zhihong Chen, Lifang Xue, Yinping Miao, Jiamin Fu","doi":"10.1016/j.optlaseng.2024.108655","DOIUrl":"10.1016/j.optlaseng.2024.108655","url":null,"abstract":"<div><div>Light field depth estimation is crucial for various applications, but current algorithms often falter when dealing with complex textures and edges. To address this, we propose a light field depth estimation network based on multi-scale fusion and channel attention (LFMCNet). It incorporates a convolutional multi-scale fusion module to enhance feature extraction and utilizes a channel attention mechanism to refine depth map accuracy. Additionally, LFMCNet integrates the Transformer Feature Fusion Module (TFFM) and Channel Attention-Based Perspective Fusion (CAPF) module for improved occlusion refinement, effectively handling challenges in occluded regions. Testing on the 4D HCI and real-world datasets demonstrates that LFMCNet significantly reduces the Bad Pixel (BP) rate and Mean Square Error (MSE).</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108655"},"PeriodicalIF":3.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose and experimentally demonstrate a single-path interferometric approach to quantify the higher-order topological charge (TC) and phase structure of a vortex beam embedded into a low-coherence background. The topological charge is determined by an in-line and common path configuration for superposing the fluctuating coherent beams loaded with vortex and non-vortex features. Ensemble average of the intensities of the superimposed fluctuating fields generates petal structure, and the number of petals infers the absolute value of the topological charge of the vortex beam. Furthermore, a three-step phase-shifting method along with a single-path interferometer is utilized to recover the phase and spectra of the TCs in the beams embedded into a low-coherence background. The results of our experiment demonstrate successful measurement of vortex beam with TCs up to 150. We believe that such petal patterns with incoherent light will be useful in sensing the rotation and motion of optically rough objects.
{"title":"Detecting topological charge and phase of the vortex beam embedded into the low coherence background","authors":"Amit Yadav , Tushar Sarkar , Takamasa Suzuki , Rakesh Kumar Singh","doi":"10.1016/j.optlaseng.2024.108668","DOIUrl":"10.1016/j.optlaseng.2024.108668","url":null,"abstract":"<div><div>We propose and experimentally demonstrate a single-path interferometric approach to quantify the higher-order topological charge (TC) and phase structure of a vortex beam embedded into a low-coherence background. The topological charge is determined by an in-line and common path configuration for superposing the fluctuating coherent beams loaded with vortex and non-vortex features. Ensemble average of the intensities of the superimposed fluctuating fields generates petal structure, and the number of petals infers the absolute value of the topological charge of the vortex beam. Furthermore, a three-step phase-shifting method along with a single-path interferometer is utilized to recover the phase and spectra of the TCs in the beams embedded into a low-coherence background. The results of our experiment demonstrate successful measurement of vortex beam with TCs up to 150. We believe that such petal patterns with incoherent light will be useful in sensing the rotation and motion of optically rough objects.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108668"},"PeriodicalIF":3.5,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.optlaseng.2024.108674
Yafeng Shen , Yi Jiang , Shangran Xie , Guanghui Sui , Xinying Zhang
High-temperature strain sensors are key elements for several applications. Key issues of the existing devices include the difficulties of sensor operating above 1000°C as well as the very strong thermal effect under high temperatures introducing significant bias on the strain measurement. Here we developed a cascaded Fabry-Perot cavity and fiber Bragg grating strain sensor fully integrated on sapphire fibers, permitting a sufficient temperature compensation and strain measurement up to 1150°C temperature. A three-point adhesive bonding process is proposed to greatly improve the adhesion performance, and hence the robustness of the device at high temperatures. Experimental results show that the fabricated strain sensor can achieve a measurement range of ±1000 με at temperature up to 1150°C. The experimental results show that the measurement accuracy is not more than 5% at room temperature. the measurement accuracy is significantly decreased at high temperature, and the maximum strain measurement error is 14% at 1150°C.
{"title":"Cascaded Fabry-Perot cavity and fiber Bragg grating on sapphire fibers for high-temperature strain sensing","authors":"Yafeng Shen , Yi Jiang , Shangran Xie , Guanghui Sui , Xinying Zhang","doi":"10.1016/j.optlaseng.2024.108674","DOIUrl":"10.1016/j.optlaseng.2024.108674","url":null,"abstract":"<div><div>High-temperature strain sensors are key elements for several applications. Key issues of the existing devices include the difficulties of sensor operating above 1000°C as well as the very strong thermal effect under high temperatures introducing significant bias on the strain measurement. Here we developed a cascaded Fabry-Perot cavity and fiber Bragg grating strain sensor fully integrated on sapphire fibers, permitting a sufficient temperature compensation and strain measurement up to 1150°C temperature. A three-point adhesive bonding process is proposed to greatly improve the adhesion performance, and hence the robustness of the device at high temperatures. Experimental results show that the fabricated strain sensor can achieve a measurement range of ±1000 με at temperature up to 1150°C. The experimental results show that the measurement accuracy is not more than 5% at room temperature. the measurement accuracy is significantly decreased at high temperature, and the maximum strain measurement error is 14% at 1150°C.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108674"},"PeriodicalIF":3.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-01DOI: 10.1016/j.optlaseng.2024.108660
Hu Liu , Jialin Liu , Wei Zhou , Baoteng Xu , Daxi Xiong , Xibin Yang
Color-multiplexed differential phase contrast (cDPC) imaging relies on deconvolving phase gradient images with phase transfer function (PTF) to extract quantitative phase information. Typically, the PTF used in the deconvolution process is assumed to be ideal. However, in practice, the presence of axial chromatic aberration causes actual PTF deviates from the ideal state, further reducing the phase reconstruction accuracy in cDPC. Therefore, the axial chromatic aberration is closely associated with the phase reconstruction accuracy in cDPC. Nevertheless, there is still a lack of quantitative methods to analyze the impact of axial chromatic aberration on the phase reconstruction accuracy of cDPC system. In this study, we propose a method to quantify the effect of axial chromatic aberration on phase reconstruction quality. This approach involves analyzing the error in the PTF affected by axial chromatic aberration, compared to the ideal PTF. Simulation and experimental results have validated the effectiveness of the proposed method. Furthermore, by computing PTF errors across different imaging plane positions, we determine the imaging plane position that has minimal phase reconstruction error in cDPC. Compared to the traditional approach of determining the optimal imaging plane position through image contrast in experiment, the imaging plane position determined by our method has smaller phase reconstruction error and fewer reconstruction artifacts.
{"title":"Impact of axial chromatic aberration on color-multiplexed differential phase contrast microscopy: A quantitative study","authors":"Hu Liu , Jialin Liu , Wei Zhou , Baoteng Xu , Daxi Xiong , Xibin Yang","doi":"10.1016/j.optlaseng.2024.108660","DOIUrl":"10.1016/j.optlaseng.2024.108660","url":null,"abstract":"<div><div>Color-multiplexed differential phase contrast (cDPC) imaging relies on deconvolving phase gradient images with phase transfer function (PTF) to extract quantitative phase information. Typically, the PTF used in the deconvolution process is assumed to be ideal. However, in practice, the presence of axial chromatic aberration causes actual PTF deviates from the ideal state, further reducing the phase reconstruction accuracy in cDPC. Therefore, the axial chromatic aberration is closely associated with the phase reconstruction accuracy in cDPC. Nevertheless, there is still a lack of quantitative methods to analyze the impact of axial chromatic aberration on the phase reconstruction accuracy of cDPC system. In this study, we propose a method to quantify the effect of axial chromatic aberration on phase reconstruction quality. This approach involves analyzing the error in the PTF affected by axial chromatic aberration, compared to the ideal PTF. Simulation and experimental results have validated the effectiveness of the proposed method. Furthermore, by computing PTF errors across different imaging plane positions, we determine the imaging plane position that has minimal phase reconstruction error in cDPC. Compared to the traditional approach of determining the optimal imaging plane position through image contrast in experiment, the imaging plane position determined by our method has smaller phase reconstruction error and fewer reconstruction artifacts.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108660"},"PeriodicalIF":3.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-31DOI: 10.1016/j.optlaseng.2024.108671
Baolin Wang , Xuejing Shi , Cheng Zhou , Binyu Li , Xuan Liu , Xinwei Li , Jipeng Huang , Lijun Song
Structured light three-dimensional (3D) imaging has advantages such as high accuracy, high resolution, and non-contact, and has enormous application value in fields such as automotive manufacturing and cultural relic detection. However, it often requires multiple structured light encoding to obtain 3D information, thus limiting the speed of 3D imaging. Single pixel imaging (SPI) technology, due to its use of structured light and single point detection to jointly obtain image information, can simply achieve simultaneous detection of multi-dimensional information through a single pixel detector array. Therefore, the structured light 3D imaging technology is combined with the single-pixel technology of multi-channel quadrant sensing, and the modulation of three structured light fields of red, green, and blue light is achieved separately through the decoupling of spatial 3D information and spectral dimension information. Combined with a quadrant sensing detector integrated with red, green, and blue filtering, simultaneous measurement of three structured light field signals is achieved. Thus, a scheme demonstration is accomplished to improve the imaging speed of 3D imaging by three times through decoupling. Further combining Gray codes and optimizing Hadamard sequences using compressive sensing ensures the accuracy and imaging quality under undersampling of 3D imaging. The experimental results show that the RMSE of our method is only 0.0576 mm. This method can be further extended to achieve high-precision and high-quality 3D reconstruction using more channel structured light modulation and more spectral detector arrays in only one parallel measurement.
{"title":"3D single pixel imaging based on parallel measurement with quadrant detector","authors":"Baolin Wang , Xuejing Shi , Cheng Zhou , Binyu Li , Xuan Liu , Xinwei Li , Jipeng Huang , Lijun Song","doi":"10.1016/j.optlaseng.2024.108671","DOIUrl":"10.1016/j.optlaseng.2024.108671","url":null,"abstract":"<div><div>Structured light three-dimensional (3D) imaging has advantages such as high accuracy, high resolution, and non-contact, and has enormous application value in fields such as automotive manufacturing and cultural relic detection. However, it often requires multiple structured light encoding to obtain 3D information, thus limiting the speed of 3D imaging. Single pixel imaging (SPI) technology, due to its use of structured light and single point detection to jointly obtain image information, can simply achieve simultaneous detection of multi-dimensional information through a single pixel detector array. Therefore, the structured light 3D imaging technology is combined with the single-pixel technology of multi-channel quadrant sensing, and the modulation of three structured light fields of red, green, and blue light is achieved separately through the decoupling of spatial 3D information and spectral dimension information. Combined with a quadrant sensing detector integrated with red, green, and blue filtering, simultaneous measurement of three structured light field signals is achieved. Thus, a scheme demonstration is accomplished to improve the imaging speed of 3D imaging by three times through decoupling. Further combining Gray codes and optimizing Hadamard sequences using compressive sensing ensures the accuracy and imaging quality under undersampling of 3D imaging. The experimental results show that the RMSE of our method is only 0.0576 mm. This method can be further extended to achieve high-precision and high-quality 3D reconstruction using more channel structured light modulation and more spectral detector arrays in only one parallel measurement.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108671"},"PeriodicalIF":3.5,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although the RGB channel requires fewer images for performing 3D measurement than the sinusoidal fringe phase-shift method, the coupling between the channels affect the measurement accuracy. Along these lines, a novel decoupling method was proposed, which was based on phase-shift calculation by encoding sinusoidal color fringe patterns. In our approach, every six sinusoidal fringes in the sinusoidal fringe phase-shift method are encoded into four sinusoidal color fringe patterns. These sinusoidal color fringes can replace six sinusoidal fringes without the effect of crosstalk. Compared with the traditional sinusoidal color fringe phase-shift method, a higher measurement accuracy was demonstrated. Moreover, there was no need for preprocessing and post-processing, and the calculation speed was faster.
{"title":"A decoupling method based on phase-shift calculation by encoding color fringe pattern","authors":"Yanjun Fu, Yunzhan Li, Fangfang Li, Guangyu Jiang, Yiliang Huang","doi":"10.1016/j.optlaseng.2024.108658","DOIUrl":"10.1016/j.optlaseng.2024.108658","url":null,"abstract":"<div><div>Although the RGB channel requires fewer images for performing 3D measurement than the sinusoidal fringe phase-shift method, the coupling between the channels affect the measurement accuracy. Along these lines, a novel decoupling method was proposed, which was based on phase-shift calculation by encoding sinusoidal color fringe patterns. In our approach, every six sinusoidal fringes in the sinusoidal fringe phase-shift method are encoded into four sinusoidal color fringe patterns. These sinusoidal color fringes can replace six sinusoidal fringes without the effect of crosstalk. Compared with the traditional sinusoidal color fringe phase-shift method, a higher measurement accuracy was demonstrated. Moreover, there was no need for preprocessing and post-processing, and the calculation speed was faster.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108658"},"PeriodicalIF":3.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.optlaseng.2024.108650
Tao Wang , Nan Wang , Sailing He
We propose a fast microscopic polarimeter for complete Mueller matrix imaging by using two rotating retarders and one polarization camera. Our new design allows us to compute the full Mueller matrix by 6 measurements in only ∼1.4s. The acquisition time is reduced by optimizing the sampling process. At the same time, the measurement precision is enhanced by minimizing the conditional numbers of the measurement matrices, compensating the pixel displacement, and calibrating the orientation of each polarization component in the system. As a demonstration, we use our fast polarimetry microscopy to measure the complete Mueller matrix for a garnet sample and cholesteric liquid crystal samples.
{"title":"Fast complete Mueller matrix polarimetry microscopy using a single polarization camera","authors":"Tao Wang , Nan Wang , Sailing He","doi":"10.1016/j.optlaseng.2024.108650","DOIUrl":"10.1016/j.optlaseng.2024.108650","url":null,"abstract":"<div><div>We propose a fast microscopic polarimeter for complete Mueller matrix imaging by using two rotating retarders and one polarization camera. Our new design allows us to compute the full Mueller matrix by 6 measurements in only ∼1.4s. The acquisition time is reduced by optimizing the sampling process. At the same time, the measurement precision is enhanced by minimizing the conditional numbers of the measurement matrices, compensating the pixel displacement, and calibrating the orientation of each polarization component in the system. As a demonstration, we use our fast polarimetry microscopy to measure the complete Mueller matrix for a garnet sample and cholesteric liquid crystal samples.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108650"},"PeriodicalIF":3.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.optlaseng.2024.108667
Napatsorn Ratanapanya, Saroj Pullteap
In this work, the development of a blood pressure (BP) system based on a fiber optic Fabry-Perot interferometer (FFPI) has been investigated. The developed system is consisted of 2 main parts: FFPI structure, and sensing probe, respectively. An aluminum-coated mirror and latex thin film have been used as a reflector and elastic material of the sensing probe. Moreover, the peak detection and also fringe counting techniques have been applied to convert the number of fringes to blood pressure and heart rate values. In addition, a standard digital sphygmomanometer has been utilized as a reference instrument for comparing the performance of FFPI sensor. Eighty-six volunteers aged 21 - 50 years old have been chosen to collect the experimental data. However, the sensing probe has been placed on right side of the neck, and a standard digital sphygmomanometer on the upper left arm of the volunteers. The results indicated that the developed system has ability to measure systolic blood pressure (SBP), and diastolic blood pressure (DBP) in the range of 91 to 128 mmHg, and 62 to 85 mmHg, respectively. Moreover, the heart rate (HR) has also been exploited in the range of 48 to 102 beats/min. By comparing the experimental results with the reference instrument, it found that the average percentage error from the blood pressure measurements is 2.84 %. Furthermore, the developed sensor has a sensitivity of 56.88 nm/mmHg. This implies that the developed system has the efficiency to measure vital signs and blood pressure with cuffless, low-cost, and non-invasive.
{"title":"A blood pressure measurement system using fiber optic-based Fabry-Perot interferometer","authors":"Napatsorn Ratanapanya, Saroj Pullteap","doi":"10.1016/j.optlaseng.2024.108667","DOIUrl":"10.1016/j.optlaseng.2024.108667","url":null,"abstract":"<div><div>In this work, the development of a blood pressure (BP) system based on a fiber optic Fabry-Perot interferometer (FFPI) has been investigated. The developed system is consisted of 2 main parts: FFPI structure, and sensing probe, respectively. An aluminum-coated mirror and latex thin film have been used as a reflector and elastic material of the sensing probe. Moreover, the peak detection and also fringe counting techniques have been applied to convert the number of fringes to blood pressure and heart rate values. In addition, a standard digital sphygmomanometer has been utilized as a reference instrument for comparing the performance of FFPI sensor. Eighty-six volunteers aged 21 - 50 years old have been chosen to collect the experimental data. However, the sensing probe has been placed on right side of the neck, and a standard digital sphygmomanometer on the upper left arm of the volunteers. The results indicated that the developed system has ability to measure systolic blood pressure (SBP), and diastolic blood pressure (DBP) in the range of 91 to 128 mmHg, and 62 to 85 mmHg, respectively. Moreover, the heart rate (HR) has also been exploited in the range of 48 to 102 beats/min. By comparing the experimental results with the reference instrument, it found that the average percentage error from the blood pressure measurements is 2.84 %. Furthermore, the developed sensor has a sensitivity of 56.88 nm/mmHg. This implies that the developed system has the efficiency to measure vital signs and blood pressure with cuffless, low-cost, and non-invasive.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108667"},"PeriodicalIF":3.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-30DOI: 10.1016/j.optlaseng.2024.108659
Xie Li, Junkang Guo, Kunpeng Liu, Zhigang Liu
This paper proposes a reflection-type surface coherent interferometric modulation imaging (R-CIMI) method based on reference light modulation, leveraging the interference light path generated by the reflected beam of the modulator and the target surface. Furthermore, we present a mask optimization strategy to enhance the similarity of diffraction pattern structures, as well as an automatic positioning approach based on optical field estimation. Owing to the anti-disturbance properties of coherent diffraction imaging, R-CIMI is less susceptible to environmental disturbances than conventional interference techniques. Simulations and experiments demonstrate that the proposed method is comparable to conventional interference methods in terms of measurement accuracy.
{"title":"Wavefront sensing and optical surface measurement method based on reference light modulation","authors":"Xie Li, Junkang Guo, Kunpeng Liu, Zhigang Liu","doi":"10.1016/j.optlaseng.2024.108659","DOIUrl":"10.1016/j.optlaseng.2024.108659","url":null,"abstract":"<div><div>This paper proposes a reflection-type surface coherent interferometric modulation imaging (R-CIMI) method based on reference light modulation, leveraging the interference light path generated by the reflected beam of the modulator and the target surface. Furthermore, we present a mask optimization strategy to enhance the similarity of diffraction pattern structures, as well as an automatic positioning approach based on optical field estimation. Owing to the anti-disturbance properties of coherent diffraction imaging, R-CIMI is less susceptible to environmental disturbances than conventional interference techniques. Simulations and experiments demonstrate that the proposed method is comparable to conventional interference methods in terms of measurement accuracy.</div></div>","PeriodicalId":49719,"journal":{"name":"Optics and Lasers in Engineering","volume":"184 ","pages":"Article 108659"},"PeriodicalIF":3.5,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142555632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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