초록 ▼

In a signal accumulating time control method and apparatus for a signal accumulating type radiation sensing device which produces an electrical signal corresponding to the amount of incident radiation and accumulates the same, an accumulating time controller has first and second different control mo

In a signal accumulating time control method and apparatus for a signal accumulating type radiation sensing device which produces an electrical signal corresponding to the amount of incident radiation and accumulates the same, an accumulating time controller has first and second different control modes and is adapted to change over from one of said first and second control modes to the other when the intensity of said incident radiation fluctuates a large amount.

대표청구항 ▼

A radiation sensing system comprising: (A) accumulation type radiation sensing means which produces an electrical indication by accumulating incident radiation over a selected accumulation time; (B) detecting means for detecting a large change in the intensity of said incident radiation, said detect

A radiation sensing system comprising: (A) accumulation type radiation sensing means which produces an electrical indication by accumulating incident radiation over a selected accumulation time; (B) detecting means for detecting a large change in the intensity of said incident radiation, said detecting means producing a characteristic output when it detects the intensity of the incident radiation; and (C) control means for controlling the accumulation time of said sensing means, said control means having first and second control modes different from each other and, in response to the characteristic output of said detecting means, changes an accumulation time control mode from one of said first and second control modes to the other, said control means, when operating in said second control mode, causes successive approximations, at different steps, of the accumulation time of said sensing means until a proper selected acccumulation time, among a plurality of different selected accumulation times, is reached such that the level of the electrical indication produced from said sensing means falls within a predetermined range.