摘要:

The paper discusses a method of reading information from an electroluminescent digital store and describes in detail the operation of a matrix containing 1282digit positions. The method of reading makes use of the non-linear electro-optical property of electroluminescent cells to provide modulation. By applying two sinusoidal excitation voltages, at frequenciesf1andf2respectively, to the selected row and column of an electroluminescent array, only the cell at the intersection will emit light at the difference frequency (f1—f2). This difference frequency may be detected in the photo-current of a photo-multiplier observing the matrix. The information is stored in the form of a punched card or mask placed between the matrix and the photo-multiplier. At a particular operating frequency, the access time and reliability of the store are shown to be a function of the signal/noise ratio at the photo-multiplier output.

DOI:10.1049/pi-b-2.1962.0184

出版商:IEE    

年代:1962

数据来源: IET

摘要:

It is shown that theoretical and practical factors limit the intensity of the image of the electron microscope to so low a value that operation under conditions of optimum resolving power is extremely difficult. A method of overcoming this difficulty by the use of a dynamic image intensifier is proposed and its theoretical performance analysed. It is shown to offer possibilities of achieving a displayed image on a cathode-ray-tube display which contains substantially all the information that can be conveyed in the microscope electron beam.The practical realization of this proposal is described, together with evidence that the theoretical prediction is achieved.

DOI:10.1049/pi-b-2.1962.0186

出版商:IEE    

年代:1962

数据来源: IET

DOI:10.1049/pi-b-2.1962.0187

出版商:IEE    

年代:1962

数据来源: IET