An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, clo...An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.展开更多
It is necessary that the laser inertial system is used to further improve the fire accuracy and quick reaction capability in the ballistic missile strapdown inertial navigation system. According to the guidance contro...It is necessary that the laser inertial system is used to further improve the fire accuracy and quick reaction capability in the ballistic missile strapdown inertial navigation system. According to the guidance controlling method and the output and error model of ballistic missile laser SIMU, the mathematical model of error propagation mechanism is set up and any transfer environmental function of error coefficient that affects the fire accuracy is deduced. Also, the missile longitudinal/lateral impact point is calculated using MATLAB. These establish the technical foundation for further researching the dispersion characteristics of impact point and reducing the laser guidance error.展开更多
A cw terahertz （THz） transmission imaging system is demonstrated and a high-quality THz image can be obtained using a pyroelectric detector. The factors that affect the imaging quality, such as the THz wavelength, s...A cw terahertz （THz） transmission imaging system is demonstrated and a high-quality THz image can be obtained using a pyroelectric detector. The factors that affect the imaging quality, such as the THz wavelength, spot size on the sample surface, step length of the motor, and frequency of the chopper, are theoretically and experimentally investigated. The experimental results show that the maximum resolution of the THz image can reach 0.4mm with the THz wavelength of 118.8μm, the spot size of 1.8mm and the step length of 0.25mm.展开更多
Influence produced by the heat effect at work of the laser instrument crystal of the semiconductor, the text designs a kind of temperature control system to the crystal of the laser instrument, using the thought and m...Influence produced by the heat effect at work of the laser instrument crystal of the semiconductor, the text designs a kind of temperature control system to the crystal of the laser instrument, using the thought and method of the classical control theory to analyze this temperature control system, and establishes mathematics model. According to mathematics model the text demonstrated the system at S field and time- area, and proposed optimizing basis to the total mark of proportion and differential parameter to con- troller PID, thus proposed a kind of temperature control scheme. And the thermostatically system is simulated by MATLAB.展开更多
We present a study of the spectral line shape associated with a High Resolution Spectrograph on the 2.16 m telescope at the Xinglong Observing Station of National Astronomical Observatories, Chinese Academy of Science...We present a study of the spectral line shape associated with a High Resolution Spectrograph on the 2.16 m telescope at the Xinglong Observing Station of National Astronomical Observatories, Chinese Academy of Sciences. This measurement is based on modeling the instrumental line shape obtained by unresolved modes from a Yb-fiber mode-locked laser frequency comb. With the current repetition rate of 250 MHz and 26 GHz mode spacing on the spectrograph, we find the absolute variation of the line center, 0.0597 pixel in the direction of the CCDs, and 0.00275 pixel （～3 m s^-1） for relative variation in successive exposures on a short timescale. A novel double-Gaussian model is presented to improve the quality of the fit by a factor of 2.47 in a typical single exposure. We also use analysis with raw moments and central moments to characterize the change in line shape across the detector. A trend in charge transfer efficiency can be found on the E2V 4096 ×4096 CCD that provides a correction for wavelength calibration aiming to reach a level of precision for radial velocity below 1 m s^- 1.展开更多
A novel method for velocity measurement is presented. In this scheme, a parallel-linear-polarization dual- frequency laser is incident on the target and senses the target velocity with both the frequencies, which can ...A novel method for velocity measurement is presented. In this scheme, a parallel-linear-polarization dual- frequency laser is incident on the target and senses the target velocity with both the frequencies, which can increase the maximum measurable velocity significantly. The theoretical analysis and verification experiment of the novel method are presented, which show that high-velocity measurement can be achieved with high precision using this method.展开更多
The HY369-B Model Laser Acupuncture Apparatus was invented byHuang Mingrong,director and engineer of the Pingyang Laser Device Factory,Zhejiang Province. The apparatus is an integration of traditional acupuncturewith ...The HY369-B Model Laser Acupuncture Apparatus was invented byHuang Mingrong,director and engineer of the Pingyang Laser Device Factory,Zhejiang Province. The apparatus is an integration of traditional acupuncturewith laser and optic fiber technique.He-Ne laser is transmitted to acupoint lo-calities on the surface of the body,or into the depth of acupoints via optic展开更多
A new model of He--Ne laseracupuncture therapeutic instrument wasused in the treatment of 122 cases of chronicprostatitis. A specially designed laserphotofiber needle conducted laser energy tothe appropriate depth of ...A new model of He--Ne laseracupuncture therapeutic instrument wasused in the treatment of 122 cases of chronicprostatitis. A specially designed laserphotofiber needle conducted laser energy tothe appropriate depth of the acupoints fordirect stimulation. The combined effects展开更多
Two dimensional particle-in-cell simulations are taken to study the interaction of a circularly polarized laser pulse with a nano-scale micro-structured target. The protons which are doped in the rear side of the targ...Two dimensional particle-in-cell simulations are taken to study the interaction of a circularly polarized laser pulse with a nano-scale micro-structured target. The protons which are doped in the rear side of the target experience the electrostatic fields caused by both the radiation pressure driven shock and the target normal sheath at the rear side of the target. A quasimonoenergetic proton bunch with central energy of about 11MeV and energy spread of ＆#8710; ε/ε about 0.18 is achieved by using a 3.45×1019 W/cm2, 66fs laser pulse. A comparison with the case of linearly polarized laser pulse and the same target condition is considered.展开更多
New tungsten ion source is produced by using single and double-pulse laser ablation system. Combined collinear Nd：YAG laser beams（266＋1064 nm） are optimized to focus on the sample in air. Optimization of the exper...New tungsten ion source is produced by using single and double-pulse laser ablation system. Combined collinear Nd：YAG laser beams（266＋1064 nm） are optimized to focus on the sample in air. Optimization of the experimental parameters is achieved to enhance the signal-to-noise ratio of the emission spectra. The velocity distribution of the emitted plasma cloud is carefully measured. The influences of the potential difference between the bias electrodes, laser wavelength and intensity on the current signal are also studied. The results show that the increase in the tungsten ion velocity under the double-pulse lasers causes the output current signal to increase by about three folds. The electron density and temperature are calculated by using the Stark-broadened line profile of tungsten line and Boltzmann plot method of the upper energy levels, respectively. The signal intensity dependence of the tungsten ion angular distribution is also analyzed. The results indicate that the double-pulse laser ablation configuration is more potent technique for producing more metal ion source deposition, thin film formation, and activated plasma-facing component material.展开更多
Invented by Dai Lisheng,a well-known Chinese laser specialist,the device is suitable for all kinds of surgery,including plastic surgery,skin operations,surgery of the internal organs and brain operations.It has been p...Invented by Dai Lisheng,a well-known Chinese laser specialist,the device is suitable for all kinds of surgery,including plastic surgery,skin operations,surgery of the internal organs and brain operations.It has been proved effective through treatment on 205 patients.With Dai him-self as the supervisor of the manufacture,the series is distributed by the New Concepts Information Company.展开更多
A method of multi-beam femtosecond laser irradiation combined with modified HF-HNO3-CH3COOH etching is used for the parallel fabrication of all-silicon piano-concave microlens arrays （MLAs）. The laser beam is split ...A method of multi-beam femtosecond laser irradiation combined with modified HF-HNO3-CH3COOH etching is used for the parallel fabrication of all-silicon piano-concave microlens arrays （MLAs）. The laser beam is split by a diffractive optical element and focused by a lens to drill microholes parallely on silicon. An HF-HNO3-H2SO4-CH3COOH solution is used to expand and polish laser-ablated microholes to form micro- lenses. Compared with the HF-HNO3-CH3COOH solution, the solution with H2SO4 can effectively reduce the etched surface roughness. The morphologies of MLAs at different laser powers and pulse numbers are observed. The image array formed by the silicon microlenses is also demonstrated.展开更多
A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Tiisapphire laser, the 5-...A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Tiisapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1×10 2 b/cm3. Some advantages of the employment of SIL have been discussed.展开更多
Jet spreading width is one of the important characteristics of water jets discharging into the air.Many researchers have dealt with measuring this width,and contact measuring methods on the water jet surface were empl...Jet spreading width is one of the important characteristics of water jets discharging into the air.Many researchers have dealt with measuring this width,and contact measuring methods on the water jet surface were employed in a lot of the cases.In order to avoid undesirable effects caused by the contact on the jet surface,we introduce non-contact measuring methods with a laser instrument to the measurements of jet spreading width.In measurements,a transmitter emits sheet-like laser beam to a receiver.The water jet between the transmitter and the receiver interrupts the laser beam and makes a shadow.The minimum and maximum values of the shadow width are measured.In addition,pictures of the water jet are taken with a scale,and the shadow width is measured from the pictures.The experiments on various needle strokes were performed.Three kinds of width consistent with the jet structure were obtained.In the results,it can be concluded that our non-contact measuring methods are feasible.The data of jet spreading widths and jet taper were obtained and are useful for future applications.展开更多
Objective: Blood vessels and their corresponding blood microcirculation are closely related to life activities. Different blood flow and microcirculation in the organism often correspond to different physiological and...Objective: Blood vessels and their corresponding blood microcirculation are closely related to life activities. Different blood flow and microcirculation in the organism often correspond to different physiological and pathological conditions. The main function of microcirculation system mainly by the arteries, capillaries and microvascular and other small blood vessels(<150 μm) composition, is to provide nutrients and oxygen for the organization at the same time, the removal of carbon dioxide and other metabolic waste. Clinical medicine, by monitoring the changes in blood flow can be achieved on diabetes, hypertension, foot ulcers, atherosclerosis,Alzheimer's disease and tumor diseases such as early diagnosis or follow-up. Therefore,monitoring blood flow in blood vessels is not only important for studying the functional and disease mechanisms of biological tissues, but also one of the important methods for the clinical diagnosis and the evaluation of diseases.Changes in skin blood flow has been a hotspot in microcirculation research. At present, the commonly used method on studying the microcirculation of blood flow changes in spatial resolution is not high enough or need to add exogenous markers, with the passage of time, the marker content will gradually reduce the impact of follow-up measurement accuracy. This study aims to investigate the application and characteristics of laser speckle imaging(LSI) in the infrared microcirculation. Methods: Firstly, prepare a complete set of infrared therapy instrument model and recruit 10 volunteers,and then using the laser speckle imaging system to monitor 10 healthy volunteers(keep hand not moving during measurement)through the infrared therapy instrument heating with the microcirculation changes in the surface of the blood flow velocity and blood flow in real time changes. Results: Infrared thermotherapy methods lead to skin microcirculation(blood flow and vasomotor), skin temperature and body temperature increased significantly. From the laser speckle image can be seen in 10 volunteers compared with the normal state of the hand, infrared stimulation after the image of the red area increased, that is, blood flow has significantly increased. Conclusion: With far infrared effect on the skin, most of the energy can be absorbed by the skin energy into heat, causing skin temperature rise, stimulating the skin heat receptors, through the thalamus reflex, the vascular smooth muscle relaxation,blood vessels, and blood circulation to speed up. On the other hand, due to thermal effects,causing the release of vasoactive substances, decreased vascular tension, shallow arteries,shallow capillaries and superficial vein dilation, blood circulation improved. Through the laser speckle imaging technology can be effectively monitored under the influence of infrared therapy instrument under the microcirculation of blood flow changes. Laser speckle imaging has achieved real-time monitoring of vascular structure and function due to the advantages of high temporal resolution and large field imaging. However, since the imaging depth of the laser speckle imaging system is affected by the penetration depth of the excitation light in human tissue limit, the current laser speckle imaging is limited to the surface of the blood vessels and blood flow imaging. Therefore, how to deepen the blood vessel flow imaging is an important future direction of the development.展开更多
基金Project(51274250)supported by the National Natural Science Foundation of ChinaProject(2012BAK09B02-05)supported by the National Key Technology R&D Program during the 12th Five-year Plan of China
文摘An integration processing system of three-dimensional laser scanning information visualization in goaf was developed. It is provided with multiple functions, such as laser scanning information management for goaf, cloud data de-noising optimization, construction, display and operation of three-dimensional model, model editing, profile generation, calculation of goaf volume and roof area, Boolean calculation among models and interaction with the third party soft ware. Concerning this system with a concise interface, plentiful data input/output interfaces, it is featured with high integration, simple and convenient operations of applications. According to practice, in addition to being well-adapted, this system is favorably reliable and stable.
文摘It is necessary that the laser inertial system is used to further improve the fire accuracy and quick reaction capability in the ballistic missile strapdown inertial navigation system. According to the guidance controlling method and the output and error model of ballistic missile laser SIMU, the mathematical model of error propagation mechanism is set up and any transfer environmental function of error coefficient that affects the fire accuracy is deduced. Also, the missile longitudinal/lateral impact point is calculated using MATLAB. These establish the technical foundation for further researching the dispersion characteristics of impact point and reducing the laser guidance error.
文摘A cw terahertz （THz） transmission imaging system is demonstrated and a high-quality THz image can be obtained using a pyroelectric detector. The factors that affect the imaging quality, such as the THz wavelength, spot size on the sample surface, step length of the motor, and frequency of the chopper, are theoretically and experimentally investigated. The experimental results show that the maximum resolution of the THz image can reach 0.4mm with the THz wavelength of 118.8μm, the spot size of 1.8mm and the step length of 0.25mm.
文摘Influence produced by the heat effect at work of the laser instrument crystal of the semiconductor, the text designs a kind of temperature control system to the crystal of the laser instrument, using the thought and method of the classical control theory to analyze this temperature control system, and establishes mathematics model. According to mathematics model the text demonstrated the system at S field and time- area, and proposed optimizing basis to the total mark of proportion and differential parameter to con- troller PID, thus proposed a kind of temperature control scheme. And the thermostatically system is simulated by MATLAB.
基金supported by the National Natural Science Foundation of China (Grant Nos. 11233004 and 11390371)supported by the Specialized Research Fund for Shandong Provincial Key Laboratory
文摘We present a study of the spectral line shape associated with a High Resolution Spectrograph on the 2.16 m telescope at the Xinglong Observing Station of National Astronomical Observatories, Chinese Academy of Sciences. This measurement is based on modeling the instrumental line shape obtained by unresolved modes from a Yb-fiber mode-locked laser frequency comb. With the current repetition rate of 250 MHz and 26 GHz mode spacing on the spectrograph, we find the absolute variation of the line center, 0.0597 pixel in the direction of the CCDs, and 0.00275 pixel （～3 m s^-1） for relative variation in successive exposures on a short timescale. A novel double-Gaussian model is presented to improve the quality of the fit by a factor of 2.47 in a typical single exposure. We also use analysis with raw moments and central moments to characterize the change in line shape across the detector. A trend in charge transfer efficiency can be found on the E2V 4096 ×4096 CCD that provides a correction for wavelength calibration aiming to reach a level of precision for radial velocity below 1 m s^- 1.
文摘A novel method for velocity measurement is presented. In this scheme, a parallel-linear-polarization dual- frequency laser is incident on the target and senses the target velocity with both the frequencies, which can increase the maximum measurable velocity significantly. The theoretical analysis and verification experiment of the novel method are presented, which show that high-velocity measurement can be achieved with high precision using this method.
文摘The HY369-B Model Laser Acupuncture Apparatus was invented byHuang Mingrong,director and engineer of the Pingyang Laser Device Factory,Zhejiang Province. The apparatus is an integration of traditional acupuncturewith laser and optic fiber technique.He-Ne laser is transmitted to acupoint lo-calities on the surface of the body,or into the depth of acupoints via optic
文摘A new model of He--Ne laseracupuncture therapeutic instrument wasused in the treatment of 122 cases of chronicprostatitis. A specially designed laserphotofiber needle conducted laser energy tothe appropriate depth of the acupoints fordirect stimulation. The combined effects
基金Supported by the National Key Basic Research Program of China under Grant No 2006CB806004, the National Natural Science Foundation of China under Grant Nos 10675155 and 10834008, Scientific Research Foundation for Awarder of Excellent Doctor Thesis, and President Award of Chinese Academy of Sciences （No 0801051-X00）.
文摘Two dimensional particle-in-cell simulations are taken to study the interaction of a circularly polarized laser pulse with a nano-scale micro-structured target. The protons which are doped in the rear side of the target experience the electrostatic fields caused by both the radiation pressure driven shock and the target normal sheath at the rear side of the target. A quasimonoenergetic proton bunch with central energy of about 11MeV and energy spread of ＆#8710; ε/ε about 0.18 is achieved by using a 3.45×1019 W/cm2, 66fs laser pulse. A comparison with the case of linearly polarized laser pulse and the same target condition is considered.
文摘New tungsten ion source is produced by using single and double-pulse laser ablation system. Combined collinear Nd：YAG laser beams（266＋1064 nm） are optimized to focus on the sample in air. Optimization of the experimental parameters is achieved to enhance the signal-to-noise ratio of the emission spectra. The velocity distribution of the emitted plasma cloud is carefully measured. The influences of the potential difference between the bias electrodes, laser wavelength and intensity on the current signal are also studied. The results show that the increase in the tungsten ion velocity under the double-pulse lasers causes the output current signal to increase by about three folds. The electron density and temperature are calculated by using the Stark-broadened line profile of tungsten line and Boltzmann plot method of the upper energy levels, respectively. The signal intensity dependence of the tungsten ion angular distribution is also analyzed. The results indicate that the double-pulse laser ablation configuration is more potent technique for producing more metal ion source deposition, thin film formation, and activated plasma-facing component material.
文摘Invented by Dai Lisheng,a well-known Chinese laser specialist,the device is suitable for all kinds of surgery,including plastic surgery,skin operations,surgery of the internal organs and brain operations.It has been proved effective through treatment on 205 patients.With Dai him-self as the supervisor of the manufacture,the series is distributed by the New Concepts Information Company.
基金supported by the National Basic Research Program of China(No.2012CB921804)the National Natural Science Foundation of China(Nos.11204236 and 61308006)the Collaborative Innovation Center of Suzhou Nano Science and Technology
文摘A method of multi-beam femtosecond laser irradiation combined with modified HF-HNO3-CH3COOH etching is used for the parallel fabrication of all-silicon piano-concave microlens arrays （MLAs）. The laser beam is split by a diffractive optical element and focused by a lens to drill microholes parallely on silicon. An HF-HNO3-H2SO4-CH3COOH solution is used to expand and polish laser-ablated microholes to form micro- lenses. Compared with the HF-HNO3-CH3COOH solution, the solution with H2SO4 can effectively reduce the etched surface roughness. The morphologies of MLAs at different laser powers and pulse numbers are observed. The image array formed by the silicon microlenses is also demonstrated.
基金This work was supported by the Innovation Foundation of the Chinese Academy of Sciences under Grant No. 40001043.
文摘A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Tiisapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1×10 2 b/cm3. Some advantages of the employment of SIL have been discussed.
文摘Jet spreading width is one of the important characteristics of water jets discharging into the air.Many researchers have dealt with measuring this width,and contact measuring methods on the water jet surface were employed in a lot of the cases.In order to avoid undesirable effects caused by the contact on the jet surface,we introduce non-contact measuring methods with a laser instrument to the measurements of jet spreading width.In measurements,a transmitter emits sheet-like laser beam to a receiver.The water jet between the transmitter and the receiver interrupts the laser beam and makes a shadow.The minimum and maximum values of the shadow width are measured.In addition,pictures of the water jet are taken with a scale,and the shadow width is measured from the pictures.The experiments on various needle strokes were performed.Three kinds of width consistent with the jet structure were obtained.In the results,it can be concluded that our non-contact measuring methods are feasible.The data of jet spreading widths and jet taper were obtained and are useful for future applications.
基金National Natural Science Foundation of Chinagrant number:61401451,61501444,61472411+5 种基金Guangdong Innovation Research Team Programgrant number:2011S013Guangdong Province Science and Technology Plan Projectsgrant number:2015B020233004Shenzhen Technology Research Projectgrant number:CXZZ201505291628137650,JSGG20160429192140681
文摘Objective: Blood vessels and their corresponding blood microcirculation are closely related to life activities. Different blood flow and microcirculation in the organism often correspond to different physiological and pathological conditions. The main function of microcirculation system mainly by the arteries, capillaries and microvascular and other small blood vessels(<150 μm) composition, is to provide nutrients and oxygen for the organization at the same time, the removal of carbon dioxide and other metabolic waste. Clinical medicine, by monitoring the changes in blood flow can be achieved on diabetes, hypertension, foot ulcers, atherosclerosis,Alzheimer's disease and tumor diseases such as early diagnosis or follow-up. Therefore,monitoring blood flow in blood vessels is not only important for studying the functional and disease mechanisms of biological tissues, but also one of the important methods for the clinical diagnosis and the evaluation of diseases.Changes in skin blood flow has been a hotspot in microcirculation research. At present, the commonly used method on studying the microcirculation of blood flow changes in spatial resolution is not high enough or need to add exogenous markers, with the passage of time, the marker content will gradually reduce the impact of follow-up measurement accuracy. This study aims to investigate the application and characteristics of laser speckle imaging(LSI) in the infrared microcirculation. Methods: Firstly, prepare a complete set of infrared therapy instrument model and recruit 10 volunteers,and then using the laser speckle imaging system to monitor 10 healthy volunteers(keep hand not moving during measurement)through the infrared therapy instrument heating with the microcirculation changes in the surface of the blood flow velocity and blood flow in real time changes. Results: Infrared thermotherapy methods lead to skin microcirculation(blood flow and vasomotor), skin temperature and body temperature increased significantly. From the laser speckle image can be seen in 10 volunteers compared with the normal state of the hand, infrared stimulation after the image of the red area increased, that is, blood flow has significantly increased. Conclusion: With far infrared effect on the skin, most of the energy can be absorbed by the skin energy into heat, causing skin temperature rise, stimulating the skin heat receptors, through the thalamus reflex, the vascular smooth muscle relaxation,blood vessels, and blood circulation to speed up. On the other hand, due to thermal effects,causing the release of vasoactive substances, decreased vascular tension, shallow arteries,shallow capillaries and superficial vein dilation, blood circulation improved. Through the laser speckle imaging technology can be effectively monitored under the influence of infrared therapy instrument under the microcirculation of blood flow changes. Laser speckle imaging has achieved real-time monitoring of vascular structure and function due to the advantages of high temporal resolution and large field imaging. However, since the imaging depth of the laser speckle imaging system is affected by the penetration depth of the excitation light in human tissue limit, the current laser speckle imaging is limited to the surface of the blood vessels and blood flow imaging. Therefore, how to deepen the blood vessel flow imaging is an important future direction of the development.
