Feeble light measuring device

Details Feeble light measuring device Feeble light measuring device

1992-07-24

1993-10-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313529, H01J 4014

Patent

active

052507955

ABSTRACT:
A feeble light measuring device comprising a photon counting tube, an image detector and a signal processor. The photon counting tube includes a photocathode for generating an electron upon an incidence of light to be measured, an MCP for multiplying the photoelectron from the photocathode and a phosphor screen for converting the photoelectrons multiplied by the MCP into a light image such as luminous spots. The MCP is not saturated by an incidence of single photoelectron. Thus the spread of the luminous spot corresponding to the single photoelectron is very small. The image detector converts the light image from the photon counting tube to electric outputs the signal processor removes noise components of the electric outputs from the image detector to extract signal components of the electric outputs.

REFERENCES:
patent: 4988859 (1991-01-01), Tsuchiya et al.

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