Westinghouse Electric

About: Westinghouse Electric is a company organization based out in Cranberry Township, Pennsylvania, United States. It is known for research contribution in the topics: Brake & Signal. The organization has 27959 authors who have published 38036 publications receiving 523387 citations.

Luminescent Centers in ZnS: Cu: Cl Phosphors

Abstract: Measurements of the magnetic susceptibility and emission spectra have been made on zinc sulfide activated by copper and/or chlorine. The results of these measurements demonstrate that the luminescent centers are diamagnetic in the absence of optical excitation, and that of the five previously reported emissions, only three are distinct. These are: a blue emission resulting from the addition of chloride, a green emission when copper and chloride are simultaneously present, and a red emission when copper alone is present. The results are discussed on an ionic model, and on a semiconductor model. We conclude that the blue emission is due to zinc vacancies, the green emission to substitutional copper, and the red emission to interstitial copper.

Parametric path modeling for an optical automatic seam tracker and real time robotic control system

Abstract: A control processor in a robotic system treats optically sensed locations along the path ahead of the tool, which are classified in relation to elapsed distances and identified in 3-D coordinates and 3-axes tool orientation, to apply in real time and under feedforward a control signal representing the error between anticipated tool position and anticipated sensed location on the path. In the process, the anticipated sensed location is obtained by reference to a model made ahead of time with the stored sensed locations grouped as a function of elapsed distances and having a common algebraic feature, such as the slope or the change of slope. A taught path for the robot has been recovered by the control processor also based on elapsed distances and control is related to actual tool position provided by the robot.

Quadriphase code-a radar pulse compression signal with unique characteristics

Abstract: A description is given of a class of radar signals called quadriphase codes. The quadriphase code described is derived from a prototype biphase code by a biphase-to-quadriphase (BTQ) transformation. These codes feature subpulses with a half-cosine shape and a phase change between the adjacent subpulses restricted to either +90 degrees or -90 degrees . This feature results in the spectrum falloff of 12 dB/octave compared with the biphase code spectrum falloff of 6 dB/octave. After a discussion of biphase codes with low autocorrelation sidelobes and tabulating selected biphase codes, the authors show the synthesis of the quadriphase code from the prototype biphase code. Quadriphase-code characteristics, including the autocorrelation function, the compressed pulse shape, the spectral characteristics, the energy pulsewidth, the pulse compression ratio, the range sampling loss, the Doppler effect, and the tabulation of selected quadriphase-code properties are presented. Digital decoding of the quadriphase codes is discussed, including the linear decoder and the coded pulse anticlutter system (CPACS) decoder, one form of phase discrimination constant false alarm rate. >

Determination of Synchronous Machine Constants by Test Reactances, Resistances, and Time Constants

Abstract: In recent years there have been many advancements made in the art of analysis of three-phase synchronous machine operation. Most treatments to date have very properly stressed the theoretical point of view, the practical point of view receiving less attention due in part to the complications involved, particularly those due to saturation effects. In this paper the practical stand-point is stressed and discussed on the basis of observations made from many tests; an important feature of these tests is that saturation effects under short circuit were studied by applying short circuits to machines operating at rated voltage. Due to serious saturation effects, the so-called constants of synchronous machines may have different values under different conditions. What are considered to be the most important of these values are discussed, and by defining certain saturated and other values, an attempt is made to provide a definite basis for the specification of machine constants. Part I reviews certain basic concepts and discusses practical considerations of test methods. Part II describes methods of determining the more important constants by test. Part III illustrates the application of these methods to actual power machinery, and presents tabulated test results as well as a table of typical constants. The Appendixes are devoted to certain additional tests and conclusions, and to development of formulas.