Increase in the Sensitivity of Photographic Materials with the Aid of Supplementary Light Intensification in the Photographing of Artificial Satellites of the Earth

摘要

It was found that uniform intensity gating of photographic negatives by weak diffused light for 3 to 5 minutes leads to a noticeable increase in the photographic effect, if the exposure was of the order of 0.05-0.01 sec. The effectiveness of the latensification of the image by intensity gating is great in those cases where the photographic materials are developed not to the maximum contrast. However, in the case of observation of artificial satellites of the earth, where the photographic materials were developed almost to maximum contrast, the gain in sensitivity amounts to about 60-80%. The corresponding increase in the limiting stellar magnitude of the observed satellite by magnitudes of 0.5-0.6, has great significance in many cases, since the intensity of the background produced by intensity gating should not go above 0.1, and the coefficient of contrast is hardly reduced. (Author)