Asia-Pacific Remote Sensing最新文献_第3页

Multiwavelength scanning standoff time-resolved Raman system for planetary exploration and environmental monitoring 用于行星探测和环境监测的多波长扫描对峙时间分辨拉曼系统

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324611

Shiv k. Sharma, J. Porter, A. Misra, T. Acosta-Maeda

{"title":"Multiwavelength scanning standoff time-resolved Raman system for planetary exploration and environmental monitoring","authors":"Shiv k. Sharma, J. Porter, A. Misra, T. Acosta-Maeda","doi":"10.1117/12.2324611","DOIUrl":"https://doi.org/10.1117/12.2324611","url":null,"abstract":"We have developed a multiwavelength Scanning Standoff Time-Resolved Raman spectroscopy (S2TR2S) system to detect minerals and chemicals from a long distance (10-100 m) over a large area. The multiwavelength SSTRRS system uses 532 and 785 nm pulsed lasers and two separate 5x beam expanders to excite spontaneous Raman spectra of the chemicals with 10 mm diameter laser beams. The VIS-NIR system employs a common Meade telescope (F/10, aperture 20.3 cm). In order to improve detection efficiency, the light collected by the telescope is directly coupled into two f/1.8 transmission spectrograph covering the VIS and NIR spectral regions by changing the volume Holographic Raman gratings for 532 and 785 nm laser lines, respectively. The spectrograph is equipped with a gated intensified CCD camera and edge filters are used to reject the reflected and Rayleigh scattered laser light. The S2TR2S system is operated using pan-tilt pointing capability for precise measurements of selected distant points (under computer control). By making standoff Raman measurements over a predefined grid array, a large area can be sampled and Raman composition maps are constructed off the distant target area. This mapping capability of the instruments has been used to identify a wide variety of minerals and hazardous chemicals from their Raman fingerprints and Raman images. The use of pulsed laser and gated detection allow the measurement of the Raman spectra of minerals with minimum interference from photoluminescence from transition metal ions and rare-earths ions, and ambient light.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126237084","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: 2

Development of conductively cooled Tm,Ho:YLF MOPA for lidar applications 激光雷达用导冷Tm,Ho:YLF MOPA的研制

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324636

M. Aoki, A. Sato, S. Ishii, K. Mizutani, K. Nakagawa

{"title":"Development of conductively cooled Tm,Ho:YLF MOPA for lidar applications","authors":"M. Aoki, A. Sato, S. Ishii, K. Mizutani, K. Nakagawa","doi":"10.1117/12.2324636","DOIUrl":"https://doi.org/10.1117/12.2324636","url":null,"abstract":"The realization of three-dimensional global wind profile measurements provides significant benefits, such as improvement in the precision of numerical weather forecasts and understanding of the causes of climate change. A spaceborne coherent Doppler wind lidar is considered to be the most powerful instrument for providing accurate tropospheric wind profiles with high spatial and temporal resolutions. Conductively cooled techniques are also important for spaceborne lidar applications because they have several advantages over liquid cooling systems. The National Institute of Information and Communications Technology (NICT) is conducting feasibility studies of conductively cooled, Q-switched 2 μm Tm,Ho:YLF lasers to meet a requirement for a spaceborne CDWL. In recent years, the energy extraction efficiency from Tm,Ho:YLF lasers has been improved dramatically by reviewing the laser rod parameters and the resonator design. In this study, we report on a single-frequency, Q-switched Tm,Ho:YLF master oscillator power amplifier (MOPA), which meets the specifications of a spaceborne CDWL transmitter. The MOPA consists of a 3.86-mlong ring oscillator and a single-pass amplifier. For the single-pass amplification, an average output power of 3.95 W, which corresponds to a pulse energy of 131.7 mJ, was obtained at a pulse repetition frequency of 30 Hz and a cooling temperature of -40°C.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124915401","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

Standoff Biofinder: powerful search for life instrument for planetary exploration 对峙生物探测仪:用于行星探测的强大的生命搜索仪器

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324201

A. Misra, T. Acosta-Maeda, J. Porter, M. Egan, M. Sandford, P. Gasda, Shiv k. Sharma, P. Lucey, D. Garmire, Jie Zhou, T. Oyama, Noah M. Acosta, C. Mckay, R. Wiens, S. Clegg, A. Ollila, N. Abedin

{"title":"Standoff Biofinder: powerful search for life instrument for planetary exploration","authors":"A. Misra, T. Acosta-Maeda, J. Porter, M. Egan, M. Sandford, P. Gasda, Shiv k. Sharma, P. Lucey, D. Garmire, Jie Zhou, T. Oyama, Noah M. Acosta, C. Mckay, R. Wiens, S. Clegg, A. Ollila, N. Abedin","doi":"10.1117/12.2324201","DOIUrl":"https://doi.org/10.1117/12.2324201","url":null,"abstract":"The “Standoff Biofinder” is a powerful “search for life” instrument that is able to detect biomolecules from a collection of rocks and minerals in a large area with detection time less than a second using a non-contact, non-destructive approach. Biological materials show strong, short-lived fluorescence signals when excited with ultraviolet-visible (UVVis) wavelengths. The Standoff Biofinder takes advantage of the short lifetimes of bio-fluorescent materials to obtain real-time images showing the locations of biological materials among luminescent minerals in a geological context. The Standoff Biofinder uses an expanded and diffused nanosecond pulsed laser to illuminate a large geological region and a gated detector to record time-resolved fluorescence images. The instrument works in daylight as well as nighttime conditions and bio-detection capability is not affected by the background light. The instrument is able to detect both live and dead biological materials, and is a useful tool for detecting the presence of both extant and extinct life on a planetary surface. The Standoff Biofinder instrument will be suitable for locating fluorescent polyaromatic hydrocarbons, amino acids, proteins, bacteria, biominerals, photosynthetic pigments, and diagenetic products of microbial life on dry landscapes and Ocean Worlds of the outer Solar System (e.g., Enceladus, Europa, and Titan). An important feature of the Standoff Biofinder instrument is its capability to detect biomolecules which are inside ice, without sample collection.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127773408","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: 3

GCOM-C/SGLI capability for coastal observation GCOM-C/SGLI沿海观测能力

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324406

H. Murakami, K. Ogata

引用次数: 1

Remote sensing-based estimation of seagrass percent cover and LAI for above ground carbon sequestration mapping 基于遥感估算海草覆盖百分比和LAI的地表固碳制图

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324695

A. Tamondong, C. Cruz, Rey Rusty Quides, M. Garcia, J. A. Cruz, J. Guihawan, A. Blanco

{"title":"Remote sensing-based estimation of seagrass percent cover and LAI for above ground carbon sequestration mapping","authors":"A. Tamondong, C. Cruz, Rey Rusty Quides, M. Garcia, J. A. Cruz, J. Guihawan, A. Blanco","doi":"10.1117/12.2324695","DOIUrl":"https://doi.org/10.1117/12.2324695","url":null,"abstract":"Seagrasses are distinct flowering plants which thrive underwater. They are part of a complex ecosystem that supports different forms of life. Recent studies found out that coastal wetlands – mangroves, saltmarshes, and seagrass, are far more proficient in sequestering and storing carbon than terrestrial ecosystems. Although seagrasses occupy only 0.2% of the area of the oceans, they sequester approximately 15% of total carbon storage in the ocean. Several remote sensing techniques are available to map and monitor seagrasses but most of them focus only on extent and area coverage. To estimate the carbon sequestration of seagrass beds, aside from extent, other parameters are needed such as leaf area index, percent cover, density, biomass etc., However, there are limits in mapping seagrass parameters using remote sensing. The reflectance measured by sensors is affected by other factors such as water absorption, turbidity, dissolved organic matter, depth and phytoplankton which affects the backscattering of energy. In this study, different remotely sensed datasets and field data were used to measure the parameters needed to estimate the carbon sequestration. Multispectral satellite images such as Sentinel-2 and PlanetScope were utilized to map the distribution and percent cover. High-resolution RGB images obtained by unmanned aerial vehicle (UAV) were also utilized to correlate field data gathered parameters. Field data such as species, percent cover, leaf area index, canopy height and above ground biomass were gathered in situ. Data extracted from different remote sensing technologies were put together to support the estimation of carbon sequestration of seagrass beds.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127547117","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: 7

The fact and causes of warm-dry and warm-wet change since 1971 in HEXI corridor area of Gansu Province, China 甘肃河西走廊地区1971年以来暖干、暖湿变化的事实及成因

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324617

Shu Lin, Li-Wei Liu, Dan-hua Li, G. Lu

{"title":"The fact and causes of warm-dry and warm-wet change since 1971 in HEXI corridor area of Gansu Province, China","authors":"Shu Lin, Li-Wei Liu, Dan-hua Li, G. Lu","doi":"10.1117/12.2324617","DOIUrl":"https://doi.org/10.1117/12.2324617","url":null,"abstract":"Based on daily precipitation data of 19 weather stations from 1971~2017 over the Hexi Corridor in Gansu, characteristics of three analytical elements (precipitation, rain days and precipitation intensity) were analyzed. Results show that precipitation in the whole Hexi Corridor increases significantly in the autumn, and the winter precipitation in the east of Jiuquan to Zhangye also increases significantly. Rainy days in summer decreases significantly, while increases significantly in autumn. The extreme events using the three analytical elements account for 56% in 2000s, showing a significant increase. It accounted only for 16%, 10%, and 18% in 1970s, 1980s and 1990s respectively. Seasonal variability of the extreme events is also significant, i.e., 70% in summer, 60% in autumn, 50% in spring and winter. The frequency of the three analytical extreme events since 2000s is about half of that since 1971.Potential causes of the interdecadal changes of summer and autumn precipitation in 1990s and 2000s were investigated. There are obvious interdecadal variation in 200 hPa and 500 hPa geopotential heights, as well as the 700 hPa relative humidity and specific humidity. This variation leads to more autumn precipitation and less summer precipitation in 2000s.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132513222","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

Simulation of non-stationary sea clutter based on DSP 基于DSP的非平稳海杂波仿真

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324123

Min Zhang, Jinxing Li, Ming Gao

引用次数: 0

Development of Tm,Ho: YLF laser for future space-based doppler wind lidar 未来天基多普勒风激光雷达用Tm,Ho: YLF激光器的研制

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324388

S. Ishii, A. Sato, M. Aoki, K. Akahane, S. Nagano, K. Nakagawa, Kaori Sato, H. Okamoto

{"title":"Development of Tm,Ho: YLF laser for future space-based doppler wind lidar","authors":"S. Ishii, A. Sato, M. Aoki, K. Akahane, S. Nagano, K. Nakagawa, Kaori Sato, H. Okamoto","doi":"10.1117/12.2324388","DOIUrl":"https://doi.org/10.1117/12.2324388","url":null,"abstract":"Most of space-based observing systems make water-vapor- and temperature-related measurements, while spacebased observing systems for wind measurement is limited. The current passive space-based observing systems for wind measurement has a large coverage area and high temporal and horizontal resolutions but has a low vertical resolution. The World Meteorological Organization (WMO) wants to develop space-based wind profiling systems. A Doppler Wind Lidar (DWL) is a useful and power technology for wind measurement and it can be designed as compact mobile, airborne, and space-based systems. DWL would provide us with a wind profile having high vertical resolution, low bias, and good precision, and it is necessary to fill the gap of current observations. The National Institute of Information and Communications Technology (NICT) is developing a single-frequency high-energy Tm,Ho:YLF laser, 2-μm key technology and instrument for a future space-based coherent DWL. We demonstrated the Tm,Ho:YLF laser producing a pulse energy of 125 mJ operating at 30 Hz meeting requirements for the future spacebased coherent DWL. In the paper, we will describe recent progress at NICT.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122476438","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

Unmanned aircraft system-based lidar survey of structures above and below the water surface: Hilo Deep Draft Harbor Breakwater, Hawaii 基于无人机系统的水面上下结构激光雷达调查:夏威夷希洛深吃水港防波堤

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324730

A. LeWinter, M. Pfennigbauer, P. Gadomski, D. Finnegan, Roland Schwarz, Jessica H. Podoski, M. Truong

{"title":"Unmanned aircraft system-based lidar survey of structures above and below the water surface: Hilo Deep Draft Harbor Breakwater, Hawaii","authors":"A. LeWinter, M. Pfennigbauer, P. Gadomski, D. Finnegan, Roland Schwarz, Jessica H. Podoski, M. Truong","doi":"10.1117/12.2324730","DOIUrl":"https://doi.org/10.1117/12.2324730","url":null,"abstract":"With recent advancements in unmanned aircraft system (UAS) technology, along with the miniaturization of airborne laser scanning systems, capabilities of unmanned laser scanning (ULS) systems have increased. Traditional terrestrial laser scanning surveys provide high density point clouds (hundreds - thousands of pts/m2) of a focus area, but have limited field-of-view and line-of-sight due to the constrained static nature of the system. While airborne and mobile laser scanning platforms relieve many of these limitations, lower point density (airborne), confined operation pathways (mobile), and higher operational costs become a factor. Here we present results from ULS data acquired over the Hilo Deep Draft Harbor Breakwater in Hawaii in June 2018. Inspecting the breakwater for failures and instabilities is of vital importance for Hilo. At three kilometers length and exposure to open ocean, a terrestrial laser scanning survey of the breakwater is not possible. Airborne and mobile laser scanning are not ideal due to reduced point densities and site access, respectively. In June 2018, using a RIEGL RiCOPTER with VUX laser system, the authors collected highresolution data over the above water breakwater extents. For below water surfaces, a Riegl BDF-1 bathymetric depth finder was operated from the same UAS, used to generate profiles of subaqueous surfaces of the breakwater. These bathymetric transects supplement the detailed topographic data collected above water on the breakwater. We discuss the operational concerns in both project planning and acquisition phases, as well as detailed analysis of the resulting data, used for a rigorous structure inspection program.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"1069 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132186251","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

Stand-off detection of amino acids and nucleic bases using a compact instrument as a tool for search for life 用一种小型仪器作为寻找生命的工具，对氨基酸和核酸进行远距离检测

Asia-Pacific Remote Sensing Pub Date : 2018-10-24 DOI: 10.1117/12.2324827

T. Acosta-Maeda, A. Misra, L. Muzangwa, G. Berlanga, Shiv k. Sharma, M. Abedin

{"title":"Stand-off detection of amino acids and nucleic bases using a compact instrument as a tool for search for life","authors":"T. Acosta-Maeda, A. Misra, L. Muzangwa, G. Berlanga, Shiv k. Sharma, M. Abedin","doi":"10.1117/12.2324827","DOIUrl":"https://doi.org/10.1117/12.2324827","url":null,"abstract":"Amino acids and nucleobases are of particular interest to NASA’s science goal of “Search for life” because they are essential for life as the basic constituents of proteins and deoxyribonucleic acids (DNA). Their detection would point to possible biosignatures and potential life bearing processes and thus there is a need for technologies capable of identifying them. Raman spectroscopy provides univocal and accurate chemical characterization of organic and inorganic compounds and can be used to detect biological materials and biomarkers in the context of planetary exploration. While micro-Raman systems are useful, a remote Raman instrument can increase the analysis area around a rover or lander. At the University of Hawai‘i we developed a portable, compact time-resolved remote-Raman instrument using a small 3” diameter mirror lens telescope, and used it to demonstrate daytime detection of amino acids and nucleobases from a distance of 8 m. The measured spectra allowed us to univocally identify 20 proteinogenic amino acids, four nucleobases, and some non-proteinogenic amino acids, despite the presence of native fluorescence, especially in aromatic compounds. We were also able to distinguish between α and β amino acids, as well as between different polymorphs. We found the remote Raman system is well suited for planetary exploration applications, with no requirement for sample preparation or collection, and rapid measurement times.","PeriodicalId":370971,"journal":{"name":"Asia-Pacific Remote Sensing","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129102912","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: 1