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The Engineering Toolbar
The Ultimate Resource for Engineering and Technical Research. (Learn More) |
Understanding Microscopes
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From Edmund Optics Inc.
Compound microscopes differ from simple magnifiers in that there are two separate magnification steps that occur instead of one. The objective lens is nearest the subject under observation and provides a magnified real image. The eyepiece magnifies the real image provided by the objective and yields a virtual image appropriate for the human eye. Remember that the eye has its own lens, which relays virtual images onto the retina. Microscopes have been standardized over time to simplify design and manufacture. Most microscopes employ the Deutsche Industrie Norm, or DIN standard configuration, while the Japanese Standard (JIS) is less commonly used. DIN microscopes begin with an object-to-image distance of 195mm, and then fix the object distance (with respect to the rear shoulder of the objective) at 45mm. The remaining 150mm distance to the eyepiece field lens sets the internal real image position, defined as 10mm from the end of the mechanical tube. Objective lens thread is the same for DIN and JIS, that is 0.7965" (20.1mm) diameter, 36 TPI, 55° Whitworth. Products & Services
Calibration standards and reference sources include any source that can provide a reference for the calibration of an instrument or comparison of a material or component.
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Data loggers and data recorders acquire digital data from sensors and other signals. They are primarily used to store data for subsequent downloads to a host PC, but may also include real-time features such as monitors and alarms.
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Data acquisition is the digitizing and processing of multiple sensor or signal inputs for the purpose of monitoring, analyzing and/or controlling systems and processes. Signal conditioning includes the amplification, filtering, converting, and other processes required to make sensor output suitable for rereading by computer boards.
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Topics of Interest
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A simple microscope is a single positive component used to magnify an object, when the object is located at or within the focal point of the component. The...
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THE MICROSCOPY
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3.3 Condenser-Lens System
The TEM may be required to produce a highly magnified ( e.g, M = 10 5) image of a specimen on a fluorescent screen, of diameter typically 15 cm. To ensure that the screen...
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