摘要:

It is known that if a point source is placed in the neighbourhood of a plane boundary, radiation may reach a point on the same side of the boundary by a route which includes a lateral wave path in the second medium. The flux arriving by such a lateral wave path is calculated for two cases, viz. (1) a semi-infinite, absorbing second medium and (2) a very thin absorbing film, placed between identical media.

ISSN:0030-3909    

DOI:10.1080/713818830

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A spherical concave grating in a Seya-Namioka monochromator is supposed divided into many small elementary gratings. Computation enables the projection of diffracted rays through the elementary gratings for incident rays emitted from a point light source situated in the plane of projection in the middle of the entrance slit, in the plane of symmetry perpendicular to the grooves of the grating. The intersection points of diffracted rays with a plane perpendicular to the diffracted ray through the vertex of the grating are determined, which give a ‘spot diagram’ in this plane. Curves of equal aberration are defined and traced on the grating. The astigmatism, the shape, and the dimensions of the geometrical image are discussed. The advantage to be obtained by the use of dissymmetrical gratings is demonstrated.

ISSN:0030-3909    

DOI:10.1080/713818840

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Es wird die Messung des radialen Brechungsindexverlaufs von Gradientenfasern in Interferenzmikroskopen untersucht. Die Bedingungen für die Justierung der Faserabschnitte im Mikroskop werden angegeben. Der Brechungsindexverlauf kann für kurze Faserabschnitte (dünne Phasenobjekte) bis zum dritten Glied einer Reihenentwicklung bestimmt werden. Bei langen Faserabschnitten oder großen Brechungsindex-Gradienten (dicke Phasenobjekte) ist das nicht ohne weiteres möglich. Für diese Fasern wird ein Verfahren angegeben, mit dem der quadratische Anteil des Brechungsindex-Profils bei bekannter Faserlänge ermittelt werden kann.

ISSN:0030-3909    

DOI:10.1080/713818834

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper will discuss a technique for cross-correlating a one-dimensional input signal with a library of stored reference signals simultaneously. The technique involves the linear scanning of a temporally-modulated image of a photographic reference mask across a temporally-integrating read-out device. First, a physical feeling for the technique is given, followed by a mathematical analysis, a description of a breadboard system now in operation, a simple experiment to demonstrate the correlators features, and a mention of some alternate configurations desirable for specific applications.

ISSN:0030-3909    

DOI:10.1080/713818831

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Two new samples are studied by a two-photon absorption process using ruby laser irradiations in ordinary mode. The loss of energy through electronic vibrational coupling to the lattice is about 6177 cm−1in tetraphene. This is about 7625 cm−1in dypiridinium thallium pentachloride, which suggests that in this sample there is a small radiationless deactivation loss besides the electronic vibrational loss. The threshold energy required for the excitation of the above process in an organo-metallic sample is two and a half times more than that in an organic sample.

ISSN:0030-3909    

DOI:10.1080/713818837

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

Based upon the simplified theory of Kubelka and Munk a quantitative relationship for the fluorescent intensity, observed from either side of a plane parallel sheet of turbid material, has been derived. The fluorescing substance is assumed to be uniformly distributed throughout the bulk of the medium. The results obtained show that fluorescence measurements from either side have good linearity over a very wide range of concentrations of fluorescing substance. Measurements from either side are very nearly equivalent in this regard. As expected, the fluorescent intensity observed at the illuminated surface is higher than that observed at the exit plane. The results are intended mainly for use in the quantitative analysis of fluorescent substances dispersed in a turbid medium. Typical applications are thin-layer chromatography and electrophoresis.

ISSN:0030-3909    

DOI:10.1080/713818832

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper deals with measurements of the pupillary response to several kinds of input signals such as sinusoidal modulated light intensity, flashes, noise and frequency-modulated flicker light. The results are compared with one another. This turns out that the dynamic behaviour of the pupillary response to continuous input signals (sinusoidal, random) differs slightly from the behaviour of the response to flashes, while the shape of the response to frequency-modulated flicker light is quite different and resembles the far-to-near response of the pupil system.

ISSN:0030-3909    

DOI:10.1080/713818835

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

It is shown that an object wave can be reconstructed from a hologram by reflecting the illuminating wave from it. The image thus formed arises due to the backward coherent scattering from the metallic silver particles in the emulsion.

ISSN:0030-3909    

DOI:10.1080/713818839

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713818829

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

ISSN:0030-3909    

DOI:10.1080/713818838

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor