Pub Date : 2021-01-01DOI: 10.1080/15599612.2021.1986612
Xinmiao Liu, Weixin Liu, Zhihao Ren, Yiming Ma, B. Dong, Guangya Zhou, Chengkuo Lee
Abstract Optomechanical sensing based on the coupling between mechanical motions and optical resonances has attracted huge interest in sensor applications due to its small footprint, high sensitivity, low detection limit, and electromagnetic immunity. Optomechanical sensors that detect from mechanical motion at µm scale to molecular vibration at nm scale have found various applications such as force, inertia, acoustic, chemical, and thermal sensing, etc. In this review, we provide an overview of the recent progress of optomechanical sensors. Three development fields of optomechanical sensors are reviewed, which are passive optomechanical sensors, electro-optomechanical sensing platforms, and molecular vibration sensing schemes. The sensor configurations, applications, and integrations are described. In the end, we also provide our perspectives on the future development directions of optomechanical sensors.
{"title":"Progress of optomechanical micro/nano sensors: a review","authors":"Xinmiao Liu, Weixin Liu, Zhihao Ren, Yiming Ma, B. Dong, Guangya Zhou, Chengkuo Lee","doi":"10.1080/15599612.2021.1986612","DOIUrl":"https://doi.org/10.1080/15599612.2021.1986612","url":null,"abstract":"Abstract Optomechanical sensing based on the coupling between mechanical motions and optical resonances has attracted huge interest in sensor applications due to its small footprint, high sensitivity, low detection limit, and electromagnetic immunity. Optomechanical sensors that detect from mechanical motion at µm scale to molecular vibration at nm scale have found various applications such as force, inertia, acoustic, chemical, and thermal sensing, etc. In this review, we provide an overview of the recent progress of optomechanical sensors. Three development fields of optomechanical sensors are reviewed, which are passive optomechanical sensors, electro-optomechanical sensing platforms, and molecular vibration sensing schemes. The sensor configurations, applications, and integrations are described. In the end, we also provide our perspectives on the future development directions of optomechanical sensors.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"120 - 159"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41878333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1080/15599612.2021.1978601
Heejae Shin, Minseok Kang, Sanghoon Lee
Abstract Neuromodulation is a multi-interdisciplinary field of neuroscience, neural engineering, and medicine in a complex, but a way of understanding. Recently, the interest and researches in this field have been attracted due to its promising applications such as bionic limbs and bioelectronic medicine. For easier entry into this field, in this review, we approach the basic mechanism, methods, and applications of peripheral neuromodulation sequentially. Firstly, the overall structure and functions of the human nervous system are introduced, especially in the peripheral nervous system (PNS). Specifically, the fundamental neurophysiology regarding action potentials and neural signals is introduced to understand the communication between the neurons. Thereafter, two main methods for peripheral neuromodulation, which are electrical and optogenetic approaches, are introduced with the principles of the state-of-art devices. Finally, advanced applications of neuromodulation combined with the sensor, stimulator, and controller, called a closed-loop system are introduced with an example of bionic limbs.
{"title":"Mechanism of peripheral nerve modulation and recent applications","authors":"Heejae Shin, Minseok Kang, Sanghoon Lee","doi":"10.1080/15599612.2021.1978601","DOIUrl":"https://doi.org/10.1080/15599612.2021.1978601","url":null,"abstract":"Abstract Neuromodulation is a multi-interdisciplinary field of neuroscience, neural engineering, and medicine in a complex, but a way of understanding. Recently, the interest and researches in this field have been attracted due to its promising applications such as bionic limbs and bioelectronic medicine. For easier entry into this field, in this review, we approach the basic mechanism, methods, and applications of peripheral neuromodulation sequentially. Firstly, the overall structure and functions of the human nervous system are introduced, especially in the peripheral nervous system (PNS). Specifically, the fundamental neurophysiology regarding action potentials and neural signals is introduced to understand the communication between the neurons. Thereafter, two main methods for peripheral neuromodulation, which are electrical and optogenetic approaches, are introduced with the principles of the state-of-art devices. Finally, advanced applications of neuromodulation combined with the sensor, stimulator, and controller, called a closed-loop system are introduced with an example of bionic limbs.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"182 - 198"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47439882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1080/15599612.2021.1923876
D. Wang, J. Zhang, L. Liu, Z. Yan, P. Wang, Y. Ding, H. Xie
Abstract Osteonecrosis becomes a more widespread problem as the population is getting older. Current osteonecrosis diagnosis not only requires invasive procedures but also often leads to surgical replacement. This paper reports a preliminary study of applying optical coherence tomography (OCT) for noninvasive diagnosis of osteonecrosis using an endoscopic probe based on a microelectromechanical (MEMS) scanning mirror. The endoscopic MEMS probe is only 2.5 mm in diameter and can scan a field of view of 24°. First a tissue sample of femoral head with osteonecrosis is scanned with the MEMS probe. The resultant OCT images can clearly delineate the necrosis region from the normal bone. Then in vivo experiments are carried out on an adult rabbit, in which the rabbit’s femoral head is scanned and imaged with the same MEMS probe and both three-dimensional (3 D) structural images and blood flows are obtained. The OCT imaging experiments show that the femoral head of this rabbit does not have osteonecrosis and its blood flow is present, which is in agreement with the destructive diagnosis. The blood flow rates in the femoral head are extracted from the OCT images acquired in three cases: normal blood supply, partial ischemia and complete ischemia, which are 19.3 mm/s, 11.9 mm/s, and 1.88 mm/s, respectively. These experiments demonstrate that OCT can clearly distinguish between the osteonecrosis and normal bone and measure the blood flow rate in the bone, both with the cartilage present, showing great potential for non-invasive osteonecrosis diagnosis.
{"title":"Application of OCT for osteonecrosis using an endoscopic probe based on an electrothermal MEMS scanning mirror","authors":"D. Wang, J. Zhang, L. Liu, Z. Yan, P. Wang, Y. Ding, H. Xie","doi":"10.1080/15599612.2021.1923876","DOIUrl":"https://doi.org/10.1080/15599612.2021.1923876","url":null,"abstract":"Abstract Osteonecrosis becomes a more widespread problem as the population is getting older. Current osteonecrosis diagnosis not only requires invasive procedures but also often leads to surgical replacement. This paper reports a preliminary study of applying optical coherence tomography (OCT) for noninvasive diagnosis of osteonecrosis using an endoscopic probe based on a microelectromechanical (MEMS) scanning mirror. The endoscopic MEMS probe is only 2.5 mm in diameter and can scan a field of view of 24°. First a tissue sample of femoral head with osteonecrosis is scanned with the MEMS probe. The resultant OCT images can clearly delineate the necrosis region from the normal bone. Then in vivo experiments are carried out on an adult rabbit, in which the rabbit’s femoral head is scanned and imaged with the same MEMS probe and both three-dimensional (3 D) structural images and blood flows are obtained. The OCT imaging experiments show that the femoral head of this rabbit does not have osteonecrosis and its blood flow is present, which is in agreement with the destructive diagnosis. The blood flow rates in the femoral head are extracted from the OCT images acquired in three cases: normal blood supply, partial ischemia and complete ischemia, which are 19.3 mm/s, 11.9 mm/s, and 1.88 mm/s, respectively. These experiments demonstrate that OCT can clearly distinguish between the osteonecrosis and normal bone and measure the blood flow rate in the bone, both with the cartilage present, showing great potential for non-invasive osteonecrosis diagnosis.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"87 - 96"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15599612.2021.1923876","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44442932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1080/15599612.2020.1857889
Jy-Been Liang, Wen-Pin Lin, Richard Wu, Connie Chen
Abstract This study examined the effects of overnight orthokeratology (OK) on higher-order wavefront aberrations (HOA), axial length elongation, and accommodation. Low to moderate myopic subjects with healthy eyes wore OK lenses nightly for 9 months. Corneal topography wavefront aberrations and accommodation were measured approximately monthly. Linear mixed-effects models were used to examine the association between the change in peripheral corneal parameters relative to the central cornea with HOA, and the association of accommodation and axial length elongation with HOA. Thirty-three participants (mean age 19.61 years) were included. Mean baseline refraction was −2.97 D (range, −1.0 to −5.0 D). The level of spherical aberration (SA) was associated with a change in relative superior-central corneal thickness (β = −0.21, SE = 0.10, p < 0.037) and with the increased difference in superior-central corneal curvature (β = 0.34, SE = 0.15, p = 0.026). The change of coma increased with the change in relative superior corneal curvature (β = 0.84, SE = 0.18, p < 0.001). Axial length elongation was associated with both horizontal coma (β = 0.19, SE = 0.07, p = 0.018) and SA (β = 0.20, SE = 0.07, p = 0.003). While accommodation and axial length were correlated with HOA, axial length elongation was not correlated with accommodation in OK lens wearers.
摘要:本研究考察了过夜角膜塑形术(OK)对高阶波前像差(HOA)、轴向长度延伸和调节的影响。视力健康的低至中度近视受试者连续9个月每晚佩戴OK型隐形眼镜。角膜地形图波前像差和调节大约每月测量一次。使用线性混合效应模型来检验角膜周围参数相对于中央角膜的变化与HOA之间的关系，以及调节和轴向长度伸长与HOA之间的关系。纳入33名参与者(平均年龄19.61岁)。平均基线屈光度为- 2.97 D(范围为- 1.0至- 5.0 D)，球差(SA)水平与角膜上中央相对厚度的变化(β = - 0.21, SE = 0.10, p < 0.037)和角膜上中央曲率差异的增加(β = 0.34, SE = 0.15, p = 0.026)相关。昏迷的变化随角膜相对上曲率的变化而增加(β = 0.84, SE = 0.18, p < 0.001)。轴向长度延长与水平昏迷(β = 0.19, SE = 0.07, p = 0.018)和SA (β = 0.20, SE = 0.07, p = 0.003)均相关。虽然调节和眼轴长度与HOA相关，但眼轴长度延伸与OK镜片佩戴者的调节无关。
{"title":"Correlation of accommodation and lens location with higher-order aberrations and axial length elongation during orthokeratology lens wear","authors":"Jy-Been Liang, Wen-Pin Lin, Richard Wu, Connie Chen","doi":"10.1080/15599612.2020.1857889","DOIUrl":"https://doi.org/10.1080/15599612.2020.1857889","url":null,"abstract":"Abstract This study examined the effects of overnight orthokeratology (OK) on higher-order wavefront aberrations (HOA), axial length elongation, and accommodation. Low to moderate myopic subjects with healthy eyes wore OK lenses nightly for 9 months. Corneal topography wavefront aberrations and accommodation were measured approximately monthly. Linear mixed-effects models were used to examine the association between the change in peripheral corneal parameters relative to the central cornea with HOA, and the association of accommodation and axial length elongation with HOA. Thirty-three participants (mean age 19.61 years) were included. Mean baseline refraction was −2.97 D (range, −1.0 to −5.0 D). The level of spherical aberration (SA) was associated with a change in relative superior-central corneal thickness (β = −0.21, SE = 0.10, p < 0.037) and with the increased difference in superior-central corneal curvature (β = 0.34, SE = 0.15, p = 0.026). The change of coma increased with the change in relative superior corneal curvature (β = 0.84, SE = 0.18, p < 0.001). Axial length elongation was associated with both horizontal coma (β = 0.19, SE = 0.07, p = 0.018) and SA (β = 0.20, SE = 0.07, p = 0.003). While accommodation and axial length were correlated with HOA, axial length elongation was not correlated with accommodation in OK lens wearers.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"1 - 9"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15599612.2020.1857889","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47563350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1080/15599612.2021.1978600
Chih-hsiung Lin, Kun-Huang Chen
Abstract In this study, an optical depth-sensing system whose focus distance was equal to its object distance was constructed by using a lens with a shortened depth of field. In addition to a mechanical control lens that captured two-dimensional images, a set of negative microlens array films used to shorten the depth of field was installed in this system. The developed system can scan a region and obtain the relationship curve between the focus distance and the motor step. Depth information is acquired by discerning the sharpness of the object’s outline and determining whether the captured object is in focus. The motor step is initialized when the object is in focus. The optical path of the developed system is simple, and its volume is minimal; thus, the developed system is suitable for being combined with cell phone lenses.
{"title":"Depth-sensing technology using a negative microlens array","authors":"Chih-hsiung Lin, Kun-Huang Chen","doi":"10.1080/15599612.2021.1978600","DOIUrl":"https://doi.org/10.1080/15599612.2021.1978600","url":null,"abstract":"Abstract In this study, an optical depth-sensing system whose focus distance was equal to its object distance was constructed by using a lens with a shortened depth of field. In addition to a mechanical control lens that captured two-dimensional images, a set of negative microlens array films used to shorten the depth of field was installed in this system. The developed system can scan a region and obtain the relationship curve between the focus distance and the motor step. Depth information is acquired by discerning the sharpness of the object’s outline and determining whether the captured object is in focus. The motor step is initialized when the object is in focus. The optical path of the developed system is simple, and its volume is minimal; thus, the developed system is suitable for being combined with cell phone lenses.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"170 - 181"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49438420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Different designs for contact lenses can result in insufficient oxygen permeability of the lenses. Moreover, the contact lens wearing schedule, replacement, lens care systems, and purchase methods are all important considerations for contact lens wearers. To evaluate the influence of tinted contact lenses with the pigment layer in different locations on the tear quality and ocular surface properties, as well as the subjective experience of the wearer In this randomized double-blind study, 30 healthy subjects (60 eyes) were randomly assigned to two groups. The pigment layer of lenses in group I was embedded within the matrix, close to the front surface, while that in group II was located on the front surface of the lens. Subjects wore the contact lenses for 7 days, 8 h a day. In both groups, the frequency of blinking after lens wear increased significantly relative to that before lens wear. The tear-breakup time was significantly shorter in group II than in group I. Temporal bulbar conjunctiva, nasal bulbar conjunctiva, temporal limbal, nasal limbal, and eyelid redness levels in both groups, and corneal staining levels in group II, were significantly increased after 7-day lens wear. Nasal bulbar conjunctiva, temporal limbal, and nasal limbal redness; eyelid smoothness; and corneal staining levels were significantly higher in group II. There was no significant between-group difference in the subjective experience. Ocular surface properties deteriorated while the frequency of blinking increased after wear of both types of tinted contact lenses for 7 days. Both designs resulted in insufficient oxygen permeability of the contact lenses.
{"title":"Effect of different tinted soft contact lenses on the tear quality and ocular surface properties","authors":"Min-Yen Hsu, Yu-Ping Wang, Pei-Yu Hong, Pei-Ying Chen, Connie Chen","doi":"10.1080/15599612.2021.1892247","DOIUrl":"https://doi.org/10.1080/15599612.2021.1892247","url":null,"abstract":"Abstract Different designs for contact lenses can result in insufficient oxygen permeability of the lenses. Moreover, the contact lens wearing schedule, replacement, lens care systems, and purchase methods are all important considerations for contact lens wearers. To evaluate the influence of tinted contact lenses with the pigment layer in different locations on the tear quality and ocular surface properties, as well as the subjective experience of the wearer In this randomized double-blind study, 30 healthy subjects (60 eyes) were randomly assigned to two groups. The pigment layer of lenses in group I was embedded within the matrix, close to the front surface, while that in group II was located on the front surface of the lens. Subjects wore the contact lenses for 7 days, 8 h a day. In both groups, the frequency of blinking after lens wear increased significantly relative to that before lens wear. The tear-breakup time was significantly shorter in group II than in group I. Temporal bulbar conjunctiva, nasal bulbar conjunctiva, temporal limbal, nasal limbal, and eyelid redness levels in both groups, and corneal staining levels in group II, were significantly increased after 7-day lens wear. Nasal bulbar conjunctiva, temporal limbal, and nasal limbal redness; eyelid smoothness; and corneal staining levels were significantly higher in group II. There was no significant between-group difference in the subjective experience. Ocular surface properties deteriorated while the frequency of blinking increased after wear of both types of tinted contact lenses for 7 days. Both designs resulted in insufficient oxygen permeability of the contact lenses.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"10 - 18"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15599612.2021.1892247","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47561960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1080/15599612.2021.1892248
Guangcan Zhou, Zi Heng Lim, Y. Qi, F. Chau, Guangya Zhou
Abstract Grating plays an essential role in various optical systems owing to its unique dispersion properties. In recent years, there is increasing demand to miniaturize optical systems for a wide range of field applications. Therefore, the integration of diffraction grating with MEMS technology provides an efficient way to build truly miniaturized optical systems. Till now, MEMS diffraction gratings have mainly been explored in two directions, namely MEMS scanning gratings and MEMS tunable gratings. MEMS scanning gratings are constructed with a variety of MEMS actuators to drive a grating platform to scan across the target, and they play a significant role in various scanning systems. Meanwhile, the dispersive properties of grating scanners make them attractive in wavelength sensing applications, including spectrometers and hyperspectral imaging systems. Tunable gratings typically employ MEMS actuators to dynamically change the diffraction properties, thus tuning its wavelength sensitivity for a specific application. Thus, this review will introduce these two types of MEMS gratings in detail and evaluate their efficiency and advantages in various fields.
{"title":"MEMS gratings and their applications","authors":"Guangcan Zhou, Zi Heng Lim, Y. Qi, F. Chau, Guangya Zhou","doi":"10.1080/15599612.2021.1892248","DOIUrl":"https://doi.org/10.1080/15599612.2021.1892248","url":null,"abstract":"Abstract Grating plays an essential role in various optical systems owing to its unique dispersion properties. In recent years, there is increasing demand to miniaturize optical systems for a wide range of field applications. Therefore, the integration of diffraction grating with MEMS technology provides an efficient way to build truly miniaturized optical systems. Till now, MEMS diffraction gratings have mainly been explored in two directions, namely MEMS scanning gratings and MEMS tunable gratings. MEMS scanning gratings are constructed with a variety of MEMS actuators to drive a grating platform to scan across the target, and they play a significant role in various scanning systems. Meanwhile, the dispersive properties of grating scanners make them attractive in wavelength sensing applications, including spectrometers and hyperspectral imaging systems. Tunable gratings typically employ MEMS actuators to dynamically change the diffraction properties, thus tuning its wavelength sensitivity for a specific application. Thus, this review will introduce these two types of MEMS gratings in detail and evaluate their efficiency and advantages in various fields.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"15 1","pages":"61 - 86"},"PeriodicalIF":5.5,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15599612.2021.1892248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45858209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study investigates the effects of variables of laser-assisted turning (LAT) and conventional turning (CT) on machining performance of 45% volume fraction silicon carbide particle reinforced 2024 aluminum matrix composites (45 vol.% SiCp/2024Al). The process benefits of laser processing variables were analyzed by comparing the surface roughness, surface microstructure and residual stress. The variables in LAT are as follows: cutting speed, feed rate, and laser power. The experimental results show that under the same cutting parameters, the LAT outperforms the CT method by reducing the surface roughness value by up to 81.73%. Unlike in CT, LAT produces more residual compressive stress. Micro-structure analysis shows that there are no microcracks on the surface of the workpiece machined by LAT.
{"title":"The study on surface integrity on laser-assisted turning of SiCp/2024Al","authors":"Changtai Zhai, Jinkai Xu, Yiquan Li, Yonggang Hou, Shuaishuai Yuan, Qimeng Liu, Xu Wang","doi":"10.1080/15599612.2020.1789251","DOIUrl":"https://doi.org/10.1080/15599612.2020.1789251","url":null,"abstract":"<p><b>Abstract</b></p> <p>The study investigates the effects of variables of laser-assisted turning (LAT) and conventional turning (CT) on machining performance of 45% volume fraction silicon carbide particle reinforced 2024 aluminum matrix composites (45 vol.% SiCp/2024Al). The process benefits of laser processing variables were analyzed by comparing the surface roughness, surface microstructure and residual stress. The variables in LAT are as follows: cutting speed, feed rate, and laser power. The experimental results show that under the same cutting parameters, the LAT outperforms the CT method by reducing the surface roughness value by up to 81.73%. Unlike in CT, LAT produces more residual compressive stress. Micro-structure analysis shows that there are no microcracks on the surface of the workpiece machined by LAT.</p>","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"64 8-9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138514522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2020-01-01DOI: 10.1080/15599612.2020.1775917
He Wei, Zhu Lianqing, Dong Mingli
Abstract A wavelength switchable erbium-doped fiber laser was constructed based on an all-fiber Mach–Zehnder interferometer (MZI) comb filter. The MZI consisted of a fiber with two tapers. An L-band erbium-doped fiber was used as the gain medium, and 1557.92, 1563.2, and 1568.06 nm single-wavelength and dual-wavelength switchable lasers at 1558, 1563.7, and 1570.2 nm were realized by adjusting the polarization controller. During scanning, the maxmin power fluctuations of single- and dual-wavelength lasing were 0.604 and 2.482 dB, respectively. The signal-to-noise ratio was >24.46 dB and the laser’s 3 dB linewidth was <0.39 nm.
{"title":"All-fiber Mach–Zehnder comb filter based on tapered fibers for wavelength switchable erbium-doped fiber lasers","authors":"He Wei, Zhu Lianqing, Dong Mingli","doi":"10.1080/15599612.2020.1775917","DOIUrl":"https://doi.org/10.1080/15599612.2020.1775917","url":null,"abstract":"Abstract A wavelength switchable erbium-doped fiber laser was constructed based on an all-fiber Mach–Zehnder interferometer (MZI) comb filter. The MZI consisted of a fiber with two tapers. An L-band erbium-doped fiber was used as the gain medium, and 1557.92, 1563.2, and 1568.06 nm single-wavelength and dual-wavelength switchable lasers at 1558, 1563.7, and 1570.2 nm were realized by adjusting the polarization controller. During scanning, the maxmin power fluctuations of single- and dual-wavelength lasing were 0.604 and 2.482 dB, respectively. The signal-to-noise ratio was >24.46 dB and the laser’s 3 dB linewidth was <0.39 nm.","PeriodicalId":50296,"journal":{"name":"International Journal of Optomechatronics","volume":"14 1","pages":"18 - 28"},"PeriodicalIF":5.5,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/15599612.2020.1775917","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48581687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2020-01-01DOI: 10.1080/15599612.2019.1694610
Nathan Worts, J. Czerski, Jason Jones, J. Field, R. Bartels, J. Squier
Abstract One of the primary challenges in advanced manufacturing (AM) is the lack of efficient optical metrics for ensuring quality control over the manufacturing process. Many current imaging techniques have excessive data requirements and require computationally intensive post-processing to effectively characterize various AM environments. Spatial frequency modulated imaging (SPIFI) addresses many of these issues with the following benefits: it is compatible with long working distance optics, provides a large field-of-view, features single element detection, and can provide enhanced resolution. Here, we demonstrate SPIFI with enhanced resolution in multiple dimensions for the first time. This is achieved by incorporating multiple linear extended excitation sources oriented with axes at arbitrary angles with respect to each other. The system utilizes a single modulation mask enabling facile implementation within existing imaging systems such as those found in laser AM systems.
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