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- W2002078739 abstract "A radio-frequency signal, gated at an audio rate, is applied to a bridge circuit. One arm of the bridge circuit is a phototube or a photomultiplier; the corresponding arm is a capacitor. The bridge is balanced in the absence of photocurrent, unbalanced in its presence, with the degree of unbalance being proportional to the average value of the photocurrent. (Dark current is canceled by an auxiliary circuit.) The null detector is an ac amplifier having a bandpass centered at the audio gating frequency, followed by a synchronous detector tuned to the same frequency. The circuits require no critical adjustments; impedances are well below the levels used in electrometer circuits, and the ultimate sensitivity is limited only by the statistical fluctuations in the dark current. At room temperature, the stability of the zero level is determined by the constancy of the mean level of the dark current. The new method makes it possible to produce stable instruments with a maximum full-scale sensitivity of 4×10−9 lu whereby, with a bandwidth of 1 cps, a signal-to-noise ratio of 100 is maintained." @default.
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- W2002078739 date "1960-08-01" @default.
- W2002078739 modified "2023-09-23" @default.
- W2002078739 title "Double Modulation Photometer" @default.
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- W2002078739 doi "https://doi.org/10.1063/1.1717064" @default.
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