It is frequently used in the fields of aerodynamics, plasma physics and heat transfer to measure pressure, density, and temperature changes in gases. The Mach–Zehnder interferometer's relatively large and freely accessible working space, and its flexibility in locating the fringes has made it the interferometer of choice for visualizing flow in wind tunnels and for flow visualization studies in general.
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: 18 In most cases, the fringes would be adjusted to lie in the same plane as the test object, so that fringes and test object can be photographed together. In Fig. 2, we see that the fringes can be adjusted so that they are localized in any desired plane. Localized fringes result when an extended source is used. By appropriately adjusting the mirrors and beam splitters, the fringes can be localized in any desired plane.Ĭollimated sources result in a nonlocalized fringe pattern. Localized fringes result when an extended source is used in a Mach–Zehnder interferometer. The result is that light travels through an equal optical path length in both the test and reference beams leading to constructive interference. In this orientation, the test and reference beams each experience two front-surface reflections, resulting in the same number of phase inversions. The reflecting surfaces of the beam splitters would be oriented so that the test and reference beams pass through an equal amount of glass. Note also the precise orientation of the beam splitters. As seen in Fig. 1, a compensating cell made of the same type of glass as the test cell (so as to have equal optical dispersion) would be placed in the path of the reference beam to match the test cell. White light in particular requires the optical paths to be simultaneously equalized over all wavelengths, or no fringes will be visible (unless a monochromatic filter is used to isolate a single wavelength). If the source has a low coherence length then great care must be taken to equalize the two optical paths. In contrast to the well-known Michelson interferometer, each of the well-separated light paths is traversed only once. The Mach–Zehnder check interferometer is a highly configurable instrument.
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230000000875 corresponding Effects 0.000 claims description 19.
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230000003287 optical Effects 0.000 title claims abstract description 19.230000000051 modifying Effects 0.000 title claims abstract description 256.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to EP13160100.7A priority Critical patent/EP2782270A1/en Priority to EP13160100.7 priority Application filed by Xiaoyang Network Co Ltd filed Critical Xiaoyang Network Co Ltd Priority to PCT/EP2014/054021 priority patent/WO2014146887A1/en Publication of CN105075153A publication Critical patent/CN105075153A/en Application granted granted Critical Publication of CN105075153B publication Critical patent/CN105075153B/en Status Active legal-status Critical Current Anticipated expiration legal-status Critical Links Original Assignee Xiaoyang Network Co Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) 罗德 Current Assignee (The listed assignees may be inaccurate.Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number CN201480015230.3A Other languages Chinese ( zh) Google Patents CN105075153A - Optical iq modulator control CN105075153A - Optical iq modulator control