Spectral Distribution Characteristics Research Articles

Some observations on the spectral distribution characteristics of short-wave radiation within Pinus radiata D. Don canopies

Some observations on the spectral distribution characteristics of short-wave radiation within Pinus radiata D. Don canopies

Photoconductive characterization of undoped, semi-insulating GaAs crystals

Extrinsic photoconductivity spatial and spectral distribution characteristics in undoped, semi-insulating GaAs crystal wafers have been investigated and the results are compared with those for optical absorption. The photoconductivity spatial distribution in a single wafer has been shown generally in reverse relation with that for optical absorption.

Luminescent Materials for Cathode-Ray Tubes

This paper describes the mantufacture, characteristics, and utilization of three kinds of luminescent materials (phosphors) which are employed in cathode-ray tube screens. The phosphors' dependence for efficiency upon minute details of manufacture is brought out, and the subject of activators discussed. The different forms of persistence and spectral distribution characteristics with their corresponding usefulness in the oscillographic and television fields are shown. One material, called phosphor No. 1 is recommended for general-purpose cathode-ray tube screens, particularly for visual observation where the highest brilliancy is desired; another, phosphor No. 2, for work where its brilliant phosphorescence is wanted for observing extremely low-frequency phenomena and transients; and the third material, phosphor No. 5, of very short persistence and highly actinic emission, when photographic records are to be taken of the cathode-ray tube trace.

Development of Cathode-Ray Tubes for Oscillographic Purposes

Some typical electrical characteristics of a cathode-ray tube electron gun are shown and the function of the various gun elements described. Light output, luminescent screen efficiency, space distribution of radiation, as well as decay and spectral distribution characteristics of willemite screens, are shown and the relations of the various factors discussed. The starting and dynamic characteristics of the tube are discussed. Magnetic and electrostatic deflection are discussed with regard to sensitivity, frequency range of application, and impedance of defection plates. In conclusion, a few general precautions in the operation of cathode-ray tubes are given.