Interferometry is a method which allows the measurement of very small distances and thicknesses by way of transmitting two beams and using the interference principle (i.e., how they reinforce or neutralize each other) to determine the difference. A problem with interferometry is that it is usually l.....
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WPANs operating in the 60 GHz millimeter-wave band connect personal computer devices within a few meters range and allow for intra-communication services for the devices. Tapered slot antennas (TSAs) are suited for such applications and can be used either as single antennas or as an element of an ar.....
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Background:Stirling cycle-based cryocoolers employ mechanical compressors activated by inductive electrical motors producing an oscillating pressure in a gas. The main disadvantage of these conventional compressors is their limited lifetime, caused by mechanical friction and wear. Wear products degr.....
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Infra-red (IR) imaging (in the LWIR and MWIR bands) is widely used for observation and surveillance applications. Most of IR optical materials are very sensitive to temperature changes. This sensitivity is reflected in a temperature dependent refractive index, that in turn it affects the focal lengt.....
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Intraocular pressure (IOP), an important part of any eye exam, is measured with a special instrument called a tonometer. The most widely employed devices are the Goldmann and the air-puff tonometers. In both, the intraocular pressure is inferred from the force required to flatten (applanate) a const.....
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