没血色
发表于 2025-3-25 06:53:18
Introductionts in data storing and processing, laser and semiconductor technology. In addition, the main feature common to all optical techniques is the non-intrusiveness, meaning that the measurements do not influence the investigated systems in any way, as conventional probes often do. This also implies the p
亲爱
发表于 2025-3-25 07:51:46
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Crumple
发表于 2025-3-25 14:18:09
Introduction to the Schlieren and Shadowgraph Methodtographic films respond to changes of brightness and, therefore, it is possible to image such objects directly on the retina or on a film (example: bright-field microscopy). The structures of an object to be investigated will generally influence transmitted light too little as to yield a recordable
Increment
发表于 2025-3-25 18:01:25
Fundamentals of Holography and Interferometrycal arrangements for such experiments are shown, and the techniques of data acquisition and evaluation are discussed. Examples demonstrate the advantages of the techniques used. The holographic interferometry has displaced the Mach-Zehnder interferometry completely, because not only is it much cheap
glamor
发表于 2025-3-25 22:22:18
Differential Interferometryia. Interferometry represents a major part among a variety of techniques. It uses the interference of two wavefronts of light propagating to the recording plane via two different optical paths — passing through or passing by the test substance. Presupposition for interference is the optical coherenc
sparse
发表于 2025-3-26 02:14:01
Pulsed Laser Holographythe square of the light wave amplitude) going through or being reflected by the scene is registered on a photosensitive surface as illustrated in Fig. 7.1. By recording this way, the information of the phase distribution of the light waves is not required. Henceforth, from a given photograph it is i
COUCH
发表于 2025-3-26 07:55:58
Evaluation of holograms by digital image processingmage analysis and image processing applicable in many technical and scientific areas (Table 8.1). Numerous problems of pattern recognition, data handling of digitized pictures, and computer graphics, formerly only reserved for computing centres, TV stations or military organizations, can now be solv
Arroyo
发表于 2025-3-26 09:02:55
Light Scattering ensemble of particles — crystals, aerosols, molecules, atoms etc. — is partially “deflected” in directions deviating from the incident direction. In some scattering processes, in addition to the change in direction, there is also a change in frequency. The evaluation of the scattered light with reg
FLAGR
发表于 2025-3-26 13:34:56
Laser-Doppler Velocimetry (LDV)n more detail it should be noted that in a modified version the same technique can be applied to velocity measurements of surfaces of solids. In comparison to traditional flow measurement techniques, e.g., the hot wire anemometer or Prandtl probe, the LDV provides the following advantages:
天文台
发表于 2025-3-26 19:36:16
Dynamic Light Scattering the sample to be determined. The theoretical foundations of this method were layed in the beginning of the century; but the high resolution required to detect and measure the small frequency shifts and narrow spectral linewidths of the scattered light imposed stringent demands on both the light sou