A Method of Determining the Overall Quantum Efficiency of Visual Discriminations by H. B. Barlow
نویسنده
چکیده
The present literature on quantum efficiency is confusing and contains contradictions partly because definitions of efficiency have differed, partly because false assumptions about the working of the eye have been implicit in the method of calculation used, and partly because the experimental results chosen for the calculations were obtained under different conditions. The present paper defines overall quantum efficiency, reviews the literature leading up to the present work, points out the difficulties that have arisen, and describes a new method for determining the efficiency that is simpler and more accurate than previous methods. The range of application and significance of quantum efficiency as a measure of visual performance are discussed. In the following paper (Barlow, 1962) some results obtained with the method will be presented. Definition. The overall quantum efficiency (F) of vision is most simply defined as the following ratio:
منابع مشابه
Measurements of the quantum efficiency of discrimination in human scotopic vision.
In the previous paper (Barlow, 1962) a method for determining the quantum efficiency of vision was described. In the present paper some results obtained on human parafoveal scotopic vision are reported. There are many experimental parameters involved in an estimate of overall quantum efficiency: for the stimulus these are the area, duration, intensity, retinal location, colour, and the relative...
متن کاملThe effect of first order magnetic field in a GaAs/AlAs spherical quantum dot with hydrogenic impurity
In this research, the effect of the first order magnetic field on the ground-state of a centered hydrogenic donor impurity in a GaAs/AlAs spherical quantum dot has been calculated. The perturbation method has been used within the framework of effective mass approximation for these calculations. Overall, the analysis shows that a proper choice of quantum dot radius and magnetic field can signifi...
متن کاملThe effect of first order magnetic field in a GaAs/AlAs spherical quantum dot with hydrogenic impurity
In this research, the effect of the first order magnetic field on the ground-state of a centered hydrogenic donor impurity in a GaAs/AlAs spherical quantum dot has been calculated. The perturbation method has been used within the framework of effective mass approximation for these calculations. Overall, the analysis shows that a proper choice of quantum dot radius and magnetic field can signifi...
متن کاملA Simple Image Analysis Method for Determination of Glucose by using Glucose Oxidase CdTe/TGA Quantum Dots
Glucose, as the major energy source in cellular metabolism, plays an important role in the natural growth of cells. Herein, a simple, rapid and low-cost method for the glucose determination by utilizing glucose oxidase and CdTe/thioglycolic acid (TGA) quantum dots (QDs) on a thin layer chromatography (TLC) plate has been described. The detection was based on the combination of the glucose enzym...
متن کاملEvaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators
Objective(s): The purpose of this study was to examine the optimal reconstruction parameters for brain dopamine transporter SPECT images obtained with a fan beam collimator and compare the results with those obtained by using parallel-hole collimators.Methods: Data acquisition was performed using two SPECT/CT devices, namely a Symbia T6 and an Infinia Hawkeye 4 (device A and B) equipped with fa...
متن کامل