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Method for controlling coming and going personnel, and a system thereof

  • US 6,975,227 B1
  • Filed: 07/21/2003
  • Issued: 12/13/2005
  • Est. Priority Date: 08/24/2000
  • Status: Expired due to Fees
First Claim
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1. A method for controlling coming and going personnel at a facility comprising the steps of:

  • ionizing air by a discharging device, the air has been contacted with a coming person who entered into a control area provided between outside and inside of the facility;

    detecting the ionized air by a mass spectrometer as a molecular weight;

    inputting the molecular weight into a control processor;

    checking the molecular weight against molecular weights of dangerous substance which have been registered previously into said control processor to detect the molecular weight of dangerous substance in the air;

    inputting a signal of the detected dangerous substance into a door driving controller; and

    closing a door provided in the control area by operating said door driving controller to prohibit said coming person from entering the facility.

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