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Device for measuring the alcohol content of a gas
| Details |
Inventors: Legrand, Guy;
Assignee:
Primary Examiner: Levy; Stewart J.
Assistant Examiner: Williams; Hezron E.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
A device for measuring the alcohol content of a gas includes an improved mechanism for determining the presence of alveolar air in the gas which is exhaled into the device by a test subject. The device has a conduit (11) into which the test subject exhales. Gas from the conduit passes through a nozzle (19) and into an intake opening (18) of a pumping device (14). Upon actuation, the pumping device extracts a first predetermined volume of exhaled air from the conduit, so that an electro-chemical cell (25) can detect the quantity of alcohol in the first predetermined volume of air. To actuate the pumping device, a predetermined value correspondig to a second volume of air must be detected by an evaluation device (28) responsive to a pressure sensitive device (27) for measuring the pressure of the gas in the conduit. In addition, the pumping device will not be actuated until a threshold circuit (35) detects a minimum pressure. |
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DETAILED DESCRIPTION One of the goals of the invention is to propose a device which can measure the alcohol content of air which is discharged at the end of an exhalation period of a subject being tested.
Another purpose of the invention is to propose such a device which can take a predetermined quantity of alveolar air, at the end of the exhalation period, regardless of the subject's thoracic capacity.
Another purpose of the invention is to propose such a device endowed with means to verify that the subject is continuously and fully exhaling air from his lungs, especially without again inhaling fresh air.
In this spirit, the invention pertains essentially to a device to analyze the alcohol content of a gas, especially to test an individual's alcoholemia level; this device is different in that it comprises a conduit (11) for the circulation of said gas, a controlled pumping device (14), connected to said conduit to take a predetermined volume of said gas when it is activated, with this pumping device being connected to means to detect and measure alcohol (25) and means (17) to control the activation of the pumping device comprising a cascade assembly of a device (27) which is sensitive to the pressure prevailing in said conduit and a device (28) to evaluate a volume of gas, controlled by said pressure sensitive device.
With such an arrangement, it is ensured that the air which is analyzed is taken towards the end of the exhalation period.
According to another important characteristic of the invention, the device also comprises means to detect a low threshold of the pressure prevailing in said conduit and logical means to link the signal issued by said evaluation means and the signal issued by said low threshold detection means, to formulate the control for the pumping system.
Thus, with such a device, the air to be analyzed is taken only when a minimum amount of air has been exhaled and when the subject stops blowing into the conduit, with the pressure in the latter falling at that time to a value close to atmospheric pressure
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