Why Tabletop SEM?

Since their introduction to the microscopy market around 2005, Tabletop SEM’s as they have come to be known, are now widely considered a highly useful microscopic analytical tool. They are utilized by many research and quality assurance laboratories. Companies and research groups that previously never thought to acquire an SEM due to the cost, infrastructure and specially trained personnel required to operate them, are now finding Desktop SEM systems to be a cost effective solution capable of providing the imaging, morphological and elemental analysis capabilities they require while simultaneously being very easy to use by multiple members of their technical staff.

事实上，这些桌面SEM甚至发现了全国各地的许多Stew Outreach计划，以获得他们提供的有价值的教育意识。易于使用，即使是监督的中学儿童也在全国各地的科学计划中运作电子显微镜，这归功于电子显微镜供应商的令人钦佩的努力。

Buyers of Scanning Electron Microscopes are faced with many decisions regarding microscope capabilities as they relate to the eventual cost of the system. Beyond the initial acquisition cost depending on the type of microscope, there may also be significant on-going costs for maintenance, service costs for the tool, the cost of facilities and even specially trained operation personnel.

The original Tabletop SEM’s introduced around 2005 like theHitachi TM-1000or the originalFei Phenom G1由于其能力有限，经验丰富的电子显微镜师未被经验丰富地观察。如今，目前的桌面SEM产品已经关闭了这种差距，较高的光束能量和近视全尺寸钨丝系统的分辨率。

The gap between capabilities of these compact, personal Tabletop SEM’s and full-size SEM systems has grown much smaller. For example, ourEM-30 serieswith its 5nm resolution, variable apertures, motorized X-Y-Tilt stage, 30kV beam energy and full-featured EDS has practically equivalent capabilities to several full-size SEM’s, especially older model systems that are becoming obsolete or are not supported such as Amray, Cambridge, ISI, Topcon, Leo, Philips/FEI – as well as older models from Hitachi and JEOL.

通常接受，大约80-90％的扫描电子显微镜成像工作是在小于10,000倍的倍数下进行的。这很容易在今天市场上的任何SEM的范围内。所有这些系统都是许多工业质量分析的实用性，以及许多具有拥有自己独特的能力的每个系统的研究工作。面对您买方的挑战是确定哪种系统最适合您对样品类型和使用方法的需求。我们建议您请求我们的文章“购买SEM时的10分”，您可以从中找到博客帖子。

Likewise, when high magnification is necessary, the buyer must be cautious regarding the marketing claims as pertains to the SEM’s ability to see nano-sized features of samples. The sample itself and how it can be prepared are often the limiting factor in what ultimate magnification is possible regardless of the microscope. The SEM resolution, spot size and scanned image capture size will most often be a more important specification to compare as these play a direct role in what effective magnification is possible. The prospective buyer is encouraged to witness the magnification of “live” images as well as “captured” images as the resolution and size of display monitors factor into the true capabilities. Some Tabletop SEM’s are marketed with a magnification claim that does not equate to a resolution necessary to achieve such a magnification. Pay close attention to this combination of resolution and magnification. All SEM systems reach a level of “hollow” magnification where further detail present in a sample cannot be observed due to the limitation of the microscope’s resolution.显微镜的分辨率及其在最小尺度下显示细节的成像的能力通常比最终放大率更重要。

Tabletop SEM systems (scanning electron microscope) are widely used for a variety of microscopic analysis of biological, inorganic and man-made materials. All Scanning Electron Microscopes utilize a focused beam of electrons to scan the surface of a sample to collect a 3-dimensional image. Imaging detectors allow surface or topographical analysis (SE – secondary electrons) as well as composition analysis (BSE – backscatter electrons) and elemental chemistry analysis (EDS – energy dispersive x-ray spectroscopy).

与具有大腔室的传统全尺寸扫描电子显微镜不同，临界真空要求和严格manbetx提款为什么速度快e的环境要求，桌面SEM可以轻松坐在标准实验室或工业环境中的桌面或实验室长凳上，其其他分析仪器没有特殊要求。所需的唯一用途是标准交流电源和小型，安静的粗加工真空泵。不需要特殊的冷却，空调或基础。当用户希望达到最高放大率时，a振动隔离由于某些环境中的环境条件，可以建议表或支持。

应用程序SEM包括生命科学(生物、取证、Pharmaceuticals, Medical) and Material Science (Semiconductors, Geology, Metallurgy, Nanotechnology). These compact Tabletop SEM’s are also used when portability is required to take the analytical tool to the sample and obtain reliable imaging and other analysis on-site. Many labs using full-size SEM systems and busy core electron microscopy centers, are finding these small Tabletop SEM’s very useful for reducing backlog or for pre-checking a sample to locate features of interest prior to using valuable time on much more expensive systems.

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