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Dosimeter for photometric applications

  • US 4,468,562 A
  • Filed: 06/17/1982
  • Issued: 08/28/1984
  • Est. Priority Date: 06/17/1982
  • Status: Expired due to Fees
First Claim
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1. A temperature independent dosimeter for measuring an amount of irradiation, which comprises:

  • a photodiode, operating in its photovoltaic mode, which produces a signal that is amplitude-proportional to the amplitude of the sensed irradiation and is substantially free of temperature effects;

    means coupled to the output of the photodiode for converting the signal to a plurality of pulses that are proportional in frequency to the amplitude of the signal;

    said converting means comprising a pair of operational amplifiers, with the inverting input of one of said operational amplifiers being responsive to the output of the photodiode;

    means coupling the output of said one operational amplifier to the inverting input of the other operational amplifier;

    feedback means from the output of said other operational amplifier to the inverting input of said one operational amplifier;

    means for counting said pulses; and

    means for terminating the irradiation when the count reaches a predetermined amount.

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