Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10051072
Hong Cheng, Haonan Zheng, Siwei Sun
For the problems of slow convergence and low accuracy of the traditional linear weighted GS iterative phase retrieval algorithm, a GS iterative phase retrieval algorithm based on the fusion of spatial phase gradient descent and frequency domain amplitude linear weighting is proposed. By zero-padding the image, and then applying phase gradient descent in each iteration of the space domain, the algorithm invokes linear weighting in the frequency domain space, thereby avoiding iterative stagnation while ensuring the convergence speed and improving the accuracy of phase retrieval.
{"title":"GS Iterative Phase Retrieval Algorithm Based on Fusion of Spatial Phase Gradient Descent and Frequency Domain Amplitude Linear Weighting","authors":"Hong Cheng, Haonan Zheng, Siwei Sun","doi":"10.1109/OGC55558.2022.10051072","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10051072","url":null,"abstract":"For the problems of slow convergence and low accuracy of the traditional linear weighted GS iterative phase retrieval algorithm, a GS iterative phase retrieval algorithm based on the fusion of spatial phase gradient descent and frequency domain amplitude linear weighting is proposed. By zero-padding the image, and then applying phase gradient descent in each iteration of the space domain, the algorithm invokes linear weighting in the frequency domain space, thereby avoiding iterative stagnation while ensuring the convergence speed and improving the accuracy of phase retrieval.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129578209","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10050920
Tian Changyong, Song Xuhao, Yin Tie, Zhang Yi
Based on the principle of laser triangulation measurement, a laser welding seam tracking sensor is developed to track U-shaped, V-shaped and flat bottom grooves of pipeline welds in real time. Aiming at the problems of reflection of pipeline welding groove and strong welding arc, which affect the accuracy of U-shaped groove feature recognition, a laser welding seam tracking sensing technology based on swing mirror is developed. The image sensor collects the weld features of the spot-shaped spot area in a cycle, and connects to form a cross-sectional weld feature, which can effectively improve the signal-to-noise ratio of the weld feature identification signal. the actual machine test of pipeline weld tracking is carried out. In the identification test of U-shaped, V-shaped, flat bottom groove, extremely deep and wide weld (40mm depth&30mm width) and extremely deep and narrow weld (40mm depth&12mm width), the sensor has good recognition accuracy and stability.
{"title":"Laser Weld Seam Tracking Sensing Technology Based on Swing Mirror","authors":"Tian Changyong, Song Xuhao, Yin Tie, Zhang Yi","doi":"10.1109/OGC55558.2022.10050920","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050920","url":null,"abstract":"Based on the principle of laser triangulation measurement, a laser welding seam tracking sensor is developed to track U-shaped, V-shaped and flat bottom grooves of pipeline welds in real time. Aiming at the problems of reflection of pipeline welding groove and strong welding arc, which affect the accuracy of U-shaped groove feature recognition, a laser welding seam tracking sensing technology based on swing mirror is developed. The image sensor collects the weld features of the spot-shaped spot area in a cycle, and connects to form a cross-sectional weld feature, which can effectively improve the signal-to-noise ratio of the weld feature identification signal. the actual machine test of pipeline weld tracking is carried out. In the identification test of U-shaped, V-shaped, flat bottom groove, extremely deep and wide weld (40mm depth&30mm width) and extremely deep and narrow weld (40mm depth&12mm width), the sensor has good recognition accuracy and stability.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123082348","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10051024
Suotao Dong, Xiuhua Fu
With the expansion of novel coronavirus pneumonia's influence on the world, people's dependence on infrared thermometer guns is increasing. In order to improve the measurement accuracy of the infrared temperature measuring gun and meet the requirements of rapid and accurate measurement of human body temperature, the core components for the infrared temperature measuring gun are developed and prepared in this paper. The film fogging phenomenon caused by the anisotropy of metal germanium and semiconductor properties is analysed and solved by measuring the atomic force microscope image and infrared spectrum of the film, the 5.5-micron infrared filter with high transmittance and good film quality was prepared by electron beam evaporation, resistance evaporation and ion source assisted deposition.
{"title":"Research on 5.5 μm Infrared Filter Applied to Infrared Thermometer","authors":"Suotao Dong, Xiuhua Fu","doi":"10.1109/OGC55558.2022.10051024","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10051024","url":null,"abstract":"With the expansion of novel coronavirus pneumonia's influence on the world, people's dependence on infrared thermometer guns is increasing. In order to improve the measurement accuracy of the infrared temperature measuring gun and meet the requirements of rapid and accurate measurement of human body temperature, the core components for the infrared temperature measuring gun are developed and prepared in this paper. The film fogging phenomenon caused by the anisotropy of metal germanium and semiconductor properties is analysed and solved by measuring the atomic force microscope image and infrared spectrum of the film, the 5.5-micron infrared filter with high transmittance and good film quality was prepared by electron beam evaporation, resistance evaporation and ion source assisted deposition.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"19 11-12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133089761","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10050923
Qianqian Wang, Xiaotong Li, Jie Liang, Runze Li
Recently, dynamically controlling of the terahertz wavefront has attract tremendous attention due to both scientific curiosity and potential applications in many fields. However, the available tunable components in the terahertz band are low efficiency and difficult to integrated with other terahertz components, due to the low light-matter interaction in this frequency range. Here, we design a tunable grating fabricated of graphene combined with metasurfaces. Coupled-mode-theory (CMT) analyses reveal the underlying physics, that is through the control of the applied voltage, graphene as tunable absorption loss, can realize dynamically controlling on the amplitude and phase of THz wavefront.
{"title":"Tuning Performance and Mechanism of Gate-tuned Graphene Grating for Dynamically Controlling Terahertz Wavefront","authors":"Qianqian Wang, Xiaotong Li, Jie Liang, Runze Li","doi":"10.1109/OGC55558.2022.10050923","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050923","url":null,"abstract":"Recently, dynamically controlling of the terahertz wavefront has attract tremendous attention due to both scientific curiosity and potential applications in many fields. However, the available tunable components in the terahertz band are low efficiency and difficult to integrated with other terahertz components, due to the low light-matter interaction in this frequency range. Here, we design a tunable grating fabricated of graphene combined with metasurfaces. Coupled-mode-theory (CMT) analyses reveal the underlying physics, that is through the control of the applied voltage, graphene as tunable absorption loss, can realize dynamically controlling on the amplitude and phase of THz wavefront.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122783787","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10051022
Qixiang Gao, Yuanhang Wang, Xing Zhong, Y. Li
Wave-front coding technology refers to placing a phase mask at the aperture stop of a traditional optical system, modulating the wavefront and phase of the incident light field at the pupil, and finally using the digital image processing method to decode to realize computational imaging. Depth of Field (DOF) is a significant issue, the wavefront of the optical system is modulated by inserting a phase plate, so that optical modulation transfer function (MTF) and point spread function (PSF) are not sensitive to the changes of the object distances within a large depth of field range. Finally, image restoration is achieved by decoding, and clear images with a large depth of field are obtained. Compared with previous work, we innovatively proposed a high-order polynomial phase plate design, considering manufacturing difficulty as an optimization factor, and finally realized 200m-100km ultra-large depth-of-field imaging in a remote sensing optical system without a focusing mechanism.
{"title":"Wave-front Coding Technology to Extend Depth of Field in Remote Sensing Optical System","authors":"Qixiang Gao, Yuanhang Wang, Xing Zhong, Y. Li","doi":"10.1109/OGC55558.2022.10051022","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10051022","url":null,"abstract":"Wave-front coding technology refers to placing a phase mask at the aperture stop of a traditional optical system, modulating the wavefront and phase of the incident light field at the pupil, and finally using the digital image processing method to decode to realize computational imaging. Depth of Field (DOF) is a significant issue, the wavefront of the optical system is modulated by inserting a phase plate, so that optical modulation transfer function (MTF) and point spread function (PSF) are not sensitive to the changes of the object distances within a large depth of field range. Finally, image restoration is achieved by decoding, and clear images with a large depth of field are obtained. Compared with previous work, we innovatively proposed a high-order polynomial phase plate design, considering manufacturing difficulty as an optimization factor, and finally realized 200m-100km ultra-large depth-of-field imaging in a remote sensing optical system without a focusing mechanism.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129072652","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10050906
G. Zafarana, E. Rizzi, L. Mauri, A. Corazza, M. Moraja
Sealed optoelectronic devices may experience performance issues, or failures, due to outgassing and release of gas species like H2O, H2, and VOCs during the operating lifetime. Hermetic packaging is the standard solution for sealing opto-electronic devices in order to protect them from external atmosphere or harsh environments, ensuring higher reliability and longer life. Unfortunately, hermeticity is not effective to prevent the release of gases from materials that are inside the sealed device. Accumulation of H2, H2O or VOCs could significantly affect the devices, leading to poor performances and drift over the lifetime. An effective way to fix this issue is to integrate getter materials. The engineered absorbing materials developed by SAES can be integrated into the packages to selectively absorb gases and preserve the device performances.
{"title":"Advanced Getter Solutions for Gas Contaminants Absorption in Optoelectronic Devices","authors":"G. Zafarana, E. Rizzi, L. Mauri, A. Corazza, M. Moraja","doi":"10.1109/OGC55558.2022.10050906","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050906","url":null,"abstract":"Sealed optoelectronic devices may experience performance issues, or failures, due to outgassing and release of gas species like H2O, H2, and VOCs during the operating lifetime. Hermetic packaging is the standard solution for sealing opto-electronic devices in order to protect them from external atmosphere or harsh environments, ensuring higher reliability and longer life. Unfortunately, hermeticity is not effective to prevent the release of gases from materials that are inside the sealed device. Accumulation of H2, H2O or VOCs could significantly affect the devices, leading to poor performances and drift over the lifetime. An effective way to fix this issue is to integrate getter materials. The engineered absorbing materials developed by SAES can be integrated into the packages to selectively absorb gases and preserve the device performances.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132458871","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}
A high-resolution microwave signal frequency measurement scheme based on optical frequency comb (OFC) and an image rejection microwave photonics channelized receiver is proposed. The scheme consists of two branches. The OFC is generated by cascaded Mach-Zehnder modulators (MZMs) in the upper branch. The optical carrier is frequency shifted by the optical frequency shifter (OFS) in the lower branch. The shifted optical carrier is sent to polarization modulator (PolM) to be modulated by the RF signal to be measured. The signal from the upper and lower branches are injected into 90-degree optical hybrid and divided into four outputs. The optical signal of each output is divided into channels by the wavelength division multiplexer (WDM) and beat by the balance photodetector (BPD). The back-end of the scheme adopts image rejection down-conversion method to prevent spectral aliasing in the measurement process. Simulation verifies the effectiveness of this scheme. The results show that the scheme can accurately measure microwave signals within the frequency range of 1-79 GHz.
{"title":"High-Resolution Microwave Frequency Measurement Based on Optical Frequency Comb and Image Rejection Photonics Channelized Receiver","authors":"Ximing Wang, Yingxi Miao, Jialiang Chen, Caili Gong, Yongfeng Wei, Yuqing Yang","doi":"10.1109/OGC55558.2022.10050949","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050949","url":null,"abstract":"A high-resolution microwave signal frequency measurement scheme based on optical frequency comb (OFC) and an image rejection microwave photonics channelized receiver is proposed. The scheme consists of two branches. The OFC is generated by cascaded Mach-Zehnder modulators (MZMs) in the upper branch. The optical carrier is frequency shifted by the optical frequency shifter (OFS) in the lower branch. The shifted optical carrier is sent to polarization modulator (PolM) to be modulated by the RF signal to be measured. The signal from the upper and lower branches are injected into 90-degree optical hybrid and divided into four outputs. The optical signal of each output is divided into channels by the wavelength division multiplexer (WDM) and beat by the balance photodetector (BPD). The back-end of the scheme adopts image rejection down-conversion method to prevent spectral aliasing in the measurement process. Simulation verifies the effectiveness of this scheme. The results show that the scheme can accurately measure microwave signals within the frequency range of 1-79 GHz.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"1 13","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113963738","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10050939
Meng Zou, K. Shen, Qizhen Sun, Zhijun Yan
We have reported an ultra narrow linewidth fiber laser based on π phase-shift fiber Bragg grating (π-FBG) and self-injection locking, in which the π-FBG is inscribed on Erbium-ytterbium co-doped fiber with scanning phase mask method. Using self-injection locking, the relaxation oscillation frequency (ROF) peak was reduced about 25 dB from -103 dB/Hz to -128 dB/Hz. The 20-dB linewidth of the laser was suppressed to around 500 Hz.
{"title":"Ultra Narrow Linewidth Distributed Feedback Fiber Laser Based on Self-injection Locking","authors":"Meng Zou, K. Shen, Qizhen Sun, Zhijun Yan","doi":"10.1109/OGC55558.2022.10050939","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050939","url":null,"abstract":"We have reported an ultra narrow linewidth fiber laser based on π phase-shift fiber Bragg grating (π-FBG) and self-injection locking, in which the π-FBG is inscribed on Erbium-ytterbium co-doped fiber with scanning phase mask method. Using self-injection locking, the relaxation oscillation frequency (ROF) peak was reduced about 25 dB from -103 dB/Hz to -128 dB/Hz. The 20-dB linewidth of the laser was suppressed to around 500 Hz.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129038463","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}
Pub Date : 2022-12-06DOI: 10.1109/OGC55558.2022.10050954
Duanming Li, Wei Zhang, Jiangfei Hu, Minxue Gu
A multi-coating photonic crystal fiber with a trapezoid-shaped slot (TS-PCF) for highly refractive index (RI) sensing is proposed. TiO2 and Indium tin oxide (ITO) are coated on the bottom of the polished-area, ITO is used as the plasmonic material. Through the full-vector finite element method (FV-FEM), the wavelength sensitivity of 5000~17000 nm/RIU in the analyte RI range of 1.31 to 1.36 is obtained. Moreover, the maximum amplitude sensitivity of 358.94 RIU-1 is also achieved with the relevant resolution of 2.79E-5 RIU. The proposed fiber sensor can be the suitable candidate for real time detecting in medical diagnostics and biomolecules applications.
{"title":"Highly Sensitive Multi-coating Photonic Crystal Fiber Biosensor at Near-Infrared Waveband","authors":"Duanming Li, Wei Zhang, Jiangfei Hu, Minxue Gu","doi":"10.1109/OGC55558.2022.10050954","DOIUrl":"https://doi.org/10.1109/OGC55558.2022.10050954","url":null,"abstract":"A multi-coating photonic crystal fiber with a trapezoid-shaped slot (TS-PCF) for highly refractive index (RI) sensing is proposed. TiO2 and Indium tin oxide (ITO) are coated on the bottom of the polished-area, ITO is used as the plasmonic material. Through the full-vector finite element method (FV-FEM), the wavelength sensitivity of 5000~17000 nm/RIU in the analyte RI range of 1.31 to 1.36 is obtained. Moreover, the maximum amplitude sensitivity of 358.94 RIU-1 is also achieved with the relevant resolution of 2.79E-5 RIU. The proposed fiber sensor can be the suitable candidate for real time detecting in medical diagnostics and biomolecules applications.","PeriodicalId":177155,"journal":{"name":"2022 IEEE 7th Optoelectronics Global Conference (OGC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121132348","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：