莱布尼茨研究所用于激光雷达大气研究的光谱仪器数字化仪和AWG

2018-12-12 07:43:00 来源:EEFOCUS
标签:
Sensitive enough to detect laser beam reflections from single atoms 100 km away even in broad daylight
 
Grosshansdorf, Germany - 12. December 2018. Atmospheric research uses pulsed laser beams to measure temperature and wind speed along the beams by measuring the Doppler shifted and backscattered light at 100 km height in the atmosphere. The returning light signals are very weak and can be blocked by sunlight, but The Leibniz Institute for Atmospheric Physics (IAP) has solved this problem: they developed the world's only portable instrument that can be used during the daytime and it has already provided new insights into Antarctic atmospheric conditions. This new generation of compact and reliable systems uses a novel, diode-pumped laser and, at its heart, are a Spectrum Instrumentation Arbitrary Waveform Generator (AWG) and two Digitizers that provide the extremely high speed, sensitivity and real-time capability required.
 
The measuring technique is called Doppler resonance LIDAR as the light is backscattered by tuning the laser precisely to a resonance transition of a metal atom. The backscattered signals are extremely weak (single photons per laser pulse) and are almost completely drowned out by solar radiation during the day. The difference between night and day measurements is that there is 100,000,000 times more background noise during the day from the sun.
 
Various lasers being tested at the IAP offices
 
Understanding temperature distributions in the atmosphere at altitudes between 80 and 110 km, called the MLT (Mesosphere and lower Thermosphere), is crucial for performing numerical simulations of the Earth's climate. One well-established approach to provide such data is to measure the Doppler broadened line width of metal atoms, e.g. of the potassium resonance line at 770 nm and of the iron resonance line at 372 nm or 386 nm, by means of resonance LIDAR systems using pulsed lasers. Until now, these lasers have used flashlamp-pumps, but this project is the first to develop a novel laser system using a highly efficient, tunable, diode-pumped, alexandrite laser that is better able to cope with rough environmental conditions such as on research ships or in polar regions. With this technology, a concentration of about 1 atom per cubic centimeter is sufficient for temperature and wind measurements at 100 km distance, which is an altitude where the atmospheric pressure is so low than only rockets can access this altitude.
 
Dr. Josef Höffner, who is leading the project, explained, "The aim of the project is to create compact mobile measurement systems that we can take around the world. Such systems require automatic operation under extreme environment conditions like Antarctica without access to them for long periods of times. We therefore need components that are very robust and reliable as well being able to provide the levels of sensitivity, speed and flexibility required under these challenging conditions. Spectrum's five-year warranty gives us peace of mind that these critical items can be relied on."  
 
There are several aspects to improving the measurements in this project. The first is suppressing the background noise by having an extremely small field of view for high resolution, optical filtering and small field of views. This means that the laser has to be stabilized in the field of view as well as all filters. The laser itself requires a complex and fast real-time stabilization system with nanosecond timing. This is controlled by the Spectrum M2i.6012 20 MS/s AWG and fires at 500 pulses a second for 24 hours a day. The signals from the backscattered light are processed by the Spectrum M4i.4421 250 MS/s 16-bit digitizer. The conditions within the laser are measured with a M4i.2221 2.5 GS/s 8-bit digitizer card. The system handles more than 1 GByte/sec for 24 hours a day with a response time of about 1 ms after processing the measured data in real-time. In total, 21 signals are managed by a software package developed at the IAP.
 
Unloading of the mobile LIDAR onto the fast ice in front of the Australian Antarctic station Davis (69° S) from the ice breaker "Aurora Australis"
 
"We have achieved a compact, highly integrated solution by combining fast, flexible electronics with real-time capability, which is an impressive improvement compared to the previous, large and difficult-to-handle solutions that were many times bigger," said Dr. Höffner. "Our old system needed a 10 ton, 6 m container and this has been shrunk to a 1500 kg system using the Spectrum cards and a novel laser. We have nearly finished shrinking this even further to fit into a one-meter cubed box of only 250 kg, which will use the same electronics and a more compact and advanced laser."
 
The sensitivity and portability of this new, highly compact device is enabling new temperature data to be obtained with unprecedented resolution and accuracy in remote places. "Our measurements have already had a big impact on our understanding of the atmosphere and, what's really exciting, is that we have proven that we can design a system that is reliable, lightweight, compact and efficient enough for future space missions," concluded Dr. Höffner.
 
Dr. Höffner presented the latest results from this project at the International Conference on Space Optics that was held on the 9-12 October in Chania, Greece.
 
关注与非网微信 ( ee-focus )
限量版产业观察、行业动态、技术大餐每日推荐
享受快时代的精品慢阅读
 

 

继续阅读
何为固态激光雷达?它有什么优势?

激光雷达被认为是各行各业的关键传感技术,在机器人、无人驾驶、智慧城市等领域充当着推动者的角色。而近年来一直被寄予厚望的固态激光雷达成为业内关注的热点。

Spectrum仪器推出16通道便携式任意波形发生器AWG

德国Spectrum仪器今日宣布推出符合LXI仪器标准的任意波形发生器(AWG),为需要测试16个同步精确电子信号的工程师和科学家带来了福音。

聚焦光幕和激光雷达安全,TUV莱茵助推行业高质量发展

8月4日,由德国莱茵TUV集团(以下简称“TUV莱茵”)、济宁市市场监督管理局和济宁国家高新技术产业开发区主办,国家半导体及显示产品质量检验中心(山东)承办的“安全光幕、激光雷达专项研讨会”在山东济宁成功举行。

初创公司造出超 mini 激光雷达,不再被干扰捆绑

据外媒报道,激光雷达是机器人和自动驾驶汽车感知周围世界的重要方式,但是激光仪和传感器通常都占据很大的空间,而初创公司Voyant Photonics却创造了一个能够放置在大头针上的激光雷达系统。

国产 AGV 产业或将替代进口,激光雷达成最后一关?

GGII数据显示,2018年AGV销量2.35万台,同比增长49.65%,2018年AGV市场规模34.81亿元,同比增长36.38%。

更多资讯
三安光电 H1 财报:营收净利分别下降 18.82% 、 52.34%、开盘再暴跌,这家龙头企业经历了什么?

与非网8月22日讯,三安光电发布了半年报,公司上半年营收为33.88亿元,同比下降18.82%;净利为8.83亿元,同比下降52.34%。营收和净利润的大幅下滑,让这家LED芯片龙头星光暗淡不少。

以闪存加速数字经济,2019全球闪存峰会在杭州举行

2019年8月22日,由浙江省经济和信息化厅、杭州市人民政府指导,杭州市萧山区人民政府主办,萧山经济技术开发区管理委员会、中国计算机学会信息存储专委会、武汉光电国家研究中心协办,北京世纪百易网络有限公司(DOIT)、杭州华澜微电子股份有限公司承办的“2019全球闪存峰会”在杭州国际博览中心(G20主会场)盛大举行。

信息孤岛难破,AI 如何解决安全难题?

震网病毒、乌克兰电网大停电事件、韩国核电站资料泄露、勒索病毒爆发,工业控制系统安全事件的频频爆发,暴露了工业控制系统安全隐患对社会的危害。

高性能计算给人工智能带来了哪些启示?

有效的IT组织可以寻求更广泛使用人工智能的方式,通过从高性能计算(HPC)中吸取的经验和教训,将其重点放在系统级思考上。

全球经济大衰退,仪器仪表还能否如鱼得水?

时下,美股遭遇重创,道指狂跌,美股年内最大单日跌幅屡屡让人大跌眼镜,这一系列的信号引发了人们对经济衰退的担忧。上一次出现这样的情况,还是2007年大衰退前夕。