Abstract

The limiting sensitivity of an alternating-current system of amplification is considered. The practical limit is determined theoretically and experimentally for measured circuit parameters. A particular circuit using an electrometer-tube and a cesium-antimony cell is shown to be capable of detecting 4.5×10−15 watt in 30 seconds. Data on various input-tubes and photoelectric cells are given.

© 1939 Optical Society of America

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