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Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques最新文献

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Textural edge extraction with an optical heterodyne scanning system 基于光学外差扫描系统的纹理边缘提取
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.tuc3
T. Poon, Jinwoo Park
{"title":"Textural edge extraction with an optical heterodyne scanning system","authors":"T. Poon, Jinwoo Park","doi":"10.1364/lors.1987.tuc3","DOIUrl":"https://doi.org/10.1364/lors.1987.tuc3","url":null,"abstract":"In many classes of images, some of the important features can be recognized by repetitive structures over a large region. Such a spatial feature provides useful information in image segmentation and classification. Various digital image processing schemes to extract textural information have been reported based on local operators manipulating image pixels, often to extract local statistics from images [1]. Other schemes exploiting the textural information in the frequency domain have also been investigated along with some successful demonstrations [2, 3]. In this paper, textural edge detection by bandpass filtering is considered. A simple technique for realizing the bandpass filter in a heterodyne optical scanning system is described and illustrated experimentally. Section II discusses textural edge detection by bandpass filtering in the context of textural image modeling and frequency domain filter function construction. Section III describes the optical scanning system capable of extracting the edge in the texture and presents some experimental results.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131211659","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}
引用次数: 0
Remote Sensing of Refractive Turbulence with Optical Spatial Filters 基于光学空间滤光片的折射湍流遥感
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.tha2
J. Churnside
{"title":"Remote Sensing of Refractive Turbulence with Optical Spatial Filters","authors":"J. Churnside","doi":"10.1364/lors.1987.tha2","DOIUrl":"https://doi.org/10.1364/lors.1987.tha2","url":null,"abstract":"If a point source of light is allowed to propagate some distance through atmospheric turbulence, it will generate a random pattern of irradiance containing a wide range of spatial scales. Similarly, if an extended light source is viewed through atmospheric turbulence by a point detector, the irradiance at the detector will vary as if the extended source was a random pattern containing a wide range of spatial scales. These phenomena can be analyzed by assuming that light scattered by each scale size of refractive fluctuations in the atmosphere at each position along the propagation path reaches the observation plane with no perturbations from refractive fluctuations at other scale sizes or path positions. This analysis will be valid as long as the path-integrated turbulence is low and saturation of scintillation can be neglected.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128544770","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}
引用次数: 0
An Experimental Measurement of the Susceptibility of Spatial Filter Profiling Techniques to Saturation 空间滤波剖面技术对饱和敏感性的实验测量
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.tuc6
G. Ochs, R. Hill
{"title":"An Experimental Measurement of the Susceptibility of Spatial Filter Profiling Techniques to Saturation","authors":"G. Ochs, R. Hill","doi":"10.1364/lors.1987.tuc6","DOIUrl":"https://doi.org/10.1364/lors.1987.tuc6","url":null,"abstract":"The current interest in the use of spatial filtering techniques to profile wind and refractive-index turbulence raises the question of how saturation of scintillation may affect these systems. Some experimental observations of saturation effects have now been made with a wind profiling system that is under development at the Wave Propagation Laboratory. The wind profiling technique, which is a modification of a method originally proposed by Lee,1 employes zero-mean spatial filters at both the transmitter and receiver to restrict the observation of refractive-index irregularities moving across a light path to those of a particular spatial wavelength and at a particular location along the path. The wind profiling system employs a number of sets of spatial filters of different spatial wavelengths to measure winds simultaneously at various path positions.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117320673","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}
引用次数: 0
Implementing a New High-Spectral-Resolution Lidar Technique for Backscatter Ratio and Atmospheric Temperature Profiling 基于后向散射比和大气温度剖面的高光谱分辨率激光雷达新技术的实现
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.wc18
C. She, R. Alvarez, H. Moosmüller, D. Krueger
{"title":"Implementing a New High-Spectral-Resolution Lidar Technique for Backscatter Ratio and Atmospheric Temperature Profiling","authors":"C. She, R. Alvarez, H. Moosmüller, D. Krueger","doi":"10.1364/lors.1987.wc18","DOIUrl":"https://doi.org/10.1364/lors.1987.wc18","url":null,"abstract":"Lidar systems rely on backscattering from air molecules (Rayleigh scattering) and from suspended aerosol particles (Mie scattering) for their return signal. Due to the thermal motion of both molecules and particles the backscattered light is Doppler broadened in frequency. Molecular backscattering has a temperature dependent linewidth of 2 GHz. Aerosol particles, being many orders of magnitude heavier than molecules, show much slower thermal motion and the resulting Doppler broadening can be neglected in most circumstances. The spectrum of backscattered light, consisting of a wide Rayleigh and a narrow Mie scattering component, is shown in Fig. 1(a).","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126775112","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}
引用次数: 0
Sum Frequency Mixing of two Tunable Nd:YAG Lasers for Sodium Fluorescence Lidar Measurements* 用于钠荧光激光雷达测量的两种可调谐Nd:YAG激光器的和频混合*
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.wa3
T. Jeys
{"title":"Sum Frequency Mixing of two Tunable Nd:YAG Lasers for Sodium Fluorescence Lidar Measurements*","authors":"T. Jeys","doi":"10.1364/lors.1987.wa3","DOIUrl":"https://doi.org/10.1364/lors.1987.wa3","url":null,"abstract":"An interesting coincidence of nature is that by sum frequency mixing the output of two appropriately tuned Nd:YAG lasers, the sum radiation may be made resonant with the sodium D2 transition wavelength. By exploiting this coincidence we have generated high power pulsed sodium resonance radiation. We plan to use this new source of sodium resonance radiation for characterizing the sodium layer in the earth's atmosphere. Figure 1 shows the cw wavelength tuning curves of the two Nd:YAG laser transitions. The 1.064 pm laser has a tuning range of about 6Å while the 1.319 μm laser has a tuning range of about 4Å. By operating the lasers at the wavelengths indicated by the arrows in Fig. 1 it is possible to generate sodium resonance radiation. In addition, it is possible to easily tune the sum radiation over the complete sodium Doppler absorption profile.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861155","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}
引用次数: 0
Optically Significant Cirrus Clouds may be Rendered "Invisible" to Space-borne Simple Lidar Systems 光学意义重大的卷云可能会被星载简单激光雷达系统渲染为“不可见”
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.mc10
C. Grund, E. Eloranta
{"title":"Optically Significant Cirrus Clouds may be Rendered \"Invisible\" to Space-borne Simple Lidar Systems","authors":"C. Grund, E. Eloranta","doi":"10.1364/lors.1987.mc10","DOIUrl":"https://doi.org/10.1364/lors.1987.mc10","url":null,"abstract":"Recently, there has been much discussion among lidar researchers concerning the infinite solution set of extinction profiles which can be produced from a given simple-lidar backscatter profile1. This ambiguity is caused by the measured backscatter signal dependence on both the backscatter cross section and on the profile of extinction. Simple lidar systems produce only one measurement from which to deduce these two range-dependent parameters. Thus, simple lidar measurements must be augmented by additional measurements or knowledge of the physical relationship between backscatter and extinction before meaningful profiles of extinction can be produced. One simple lidar retrieval method assumes independent knowledge of extinction at at least one range and an assumed relationship between the backscatter cross section and extinction2. A second method seeks a common solution to several simple lidar profiles produced by observations at different viewing angles3,4,6.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123219567","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}
引用次数: 0
Development of Laser Heterodyne Radiometer for Monitoring Stratospheric Air Pollution 用于平流层空气污染监测的激光外差辐射计的研制
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.tuc5
M. Ishizu, T. Itabe, T. Aruga
{"title":"Development of Laser Heterodyne Radiometer for Monitoring Stratospheric Air Pollution","authors":"M. Ishizu, T. Itabe, T. Aruga","doi":"10.1364/lors.1987.tuc5","DOIUrl":"https://doi.org/10.1364/lors.1987.tuc5","url":null,"abstract":"Laser heterodyne radiometers using a CO2 laser and a Pb-salt diode laser as local oscillators have been developed for the detection of the stratospheric minor constituents. Among them, sulfer bearing compounds such as OCS and SO2 are related to the formation of the stratospheric aerosols, and they are the main concern of our study. According to a direct sampling method, the mixing ratio of OCS molecules in the atmosphere has been estimated to be 0.5 ppbv at the altitude of lower than about 20km and to decrease monotonically in the upper atmosphere. Due to the small amount of the stratospheric OCS molecules, a solar occultation measurement using a balloon-borne laser heterodyne radiometer will be required for the detection. The radiometers which are described below have been constructed for a laboratory measurement and resulted in successful detection of many absorption lines in the solar spectrum around a wavelength region of 10 um.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127625975","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}
引用次数: 0
Laser Sources and Sensitivity Calculations for a Near-Infrared Dial System 近红外刻度盘系统的激光源和灵敏度计算
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.wc5
M. Milton, B. W. Jolliffe, R. Partridge, P. Woods
{"title":"Laser Sources and Sensitivity Calculations for a Near-Infrared Dial System","authors":"M. Milton, B. W. Jolliffe, R. Partridge, P. Woods","doi":"10.1364/lors.1987.wc5","DOIUrl":"https://doi.org/10.1364/lors.1987.wc5","url":null,"abstract":"The applications of DIAL systems operating in the near ultraviolet and visible spectral regions are limited to the small number of species that absorb in those regions. However, the infrared spectral region offers the possibility of detecting a much larger number of gases, including most of the hydrocarbons. Although many DIAL systems have been constructed for use in the mid-infrared (at 10 μm in particular), relatively few attempts1-4 have been made to use the near-infrared despite the large number of strong absorption lines, particularly around 3 μm. The design of a direct-detection DIAL system to operate in this region involves a considerable number of differences from DIAL systems operating in other spectral regions. We consider here: the spectroscopy of target gases, possible laser sources, and the sensitivity and accuracy that might be expected from such a system, with particular consideration to its use for measuring hydrocarbon concentrations at the ppm level in the atmosphere.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"6061 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134156004","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}
引用次数: 0
High Spectral Resolution Lidar Measurements of Cirrus Cloud Optical Properties 卷云光学特性的高光谱分辨率激光雷达测量
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.mc9
C. Grund, E. Eloranta
{"title":"High Spectral Resolution Lidar Measurements of Cirrus Cloud Optical Properties","authors":"C. Grund, E. Eloranta","doi":"10.1364/lors.1987.mc9","DOIUrl":"https://doi.org/10.1364/lors.1987.mc9","url":null,"abstract":"Lidar backscatter signals are generated by scattering from both molecules and particles. The spectral distribution of light scattered by molecules is Doppler-broadened by rapid, thermally induced, molecular motions. Light scattered by aerosols and cirrus particles is essentially unshifted because of the relatively slow Brownian motion of particles. Using this difference, the High Spectral Resolution Lidar (HSRL)1,2 interferometrically separates particulate from molecular backscatter. By using the distribution of molecular scattering as a known target, the HSRL achieves unambiguous, calibrated measurements of atmospheric extinction, backscatter cross section, and backscatter phase function.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126824345","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}
引用次数: 0
Sources and Technology for Coherant Lidar Wind Measurement 相干激光雷达风测量的来源与技术
Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques Pub Date : 1900-01-01 DOI: 10.1364/lors.1987.wb2
M. Vaughan
{"title":"Sources and Technology for Coherant Lidar Wind Measurement","authors":"M. Vaughan","doi":"10.1364/lors.1987.wb2","DOIUrl":"https://doi.org/10.1364/lors.1987.wb2","url":null,"abstract":"The required characteristics of laser sources, both pulsed and cw, are described and illustrated. Technology questions in attaining quantum limited system performance are briefly outlined.","PeriodicalId":339230,"journal":{"name":"Topical Meeting on Laser and Optical Remote Sensing: Instrumentation and Techniques","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125548079","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}
引用次数: 0
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