Apparatus for determining the alcohol content of blood

Details Apparatus for determining the alcohol content of blood Apparatus for determining the alcohol content of blood

G - Physics

01

N

73/59

G01N 21/01 (2006.01)

Patent

CA 1044483

ABSTRACT OF THE DISCLOSURE The invention provides an apparatus for determing the alcohol content of blood by measuring the concentration of alcohol in exhaled breath. The apparatus includes a measuring chamber having an inlet via which exhaled breath can be blown in, a radia- tion inlet at one end of the measuring chamber and a radiation outlet at the other end of the measuring chamber. A radiation source in the form of a wide band thermal radiator is located up- stream of the radiation inlet. An interrupting device is located in the path of the beam and a filter having a pass band at 3.46 µm is arranged as a tuned receiver downstream of the radiation outlet of the measuring chamber. A first photo-electric detector is arranged beyond the filter and a second detector is arranged in the path of the beam beyond the radiation outlet of the measuring chamber and in front of the filter. An amplifier is connected to the output of the first detector. A reference voltage source is connected to the output of the second detector, the outputs of the amplifier and the reference voltage source being connected to a differential amplifier. A drive motor is connected to the out- put of the differential amplifier. An absorption device is dis- placeable in and at right angles to the path of the beam between the radiation outlet of the measuring chamber and the photo-electric detector, the absorption device being in the form of a wedge con- nected to the drive motor and having absorption in the band width of the filter. The drive motor is arranged to automatically dis- place the wedge to maintain at zero the voltage at the output of the differential amplifier. An indicator is connected to the drive motor for the wedge and is arranged to indicate the position of the wedge in the path of the beam. -1-

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