| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ethyl alcohol detector which detects ethyl alcohol in the blood from infrared rays emitted from a driver and is utilized for preventing driving under the influence of liquor. <P>SOLUTION: An imaging control part 42 captures a first subject image of a first wavelength band containing the absorbing wavelength λ1 of ethyl alcohol from the infrared radiated light of a subject 20 or reflected light and a second subject image of a second wavelength band containing the other absorbing wavelength λ2 of a disturbance substance having an absorbing wavelength in the same first wavelength band as ethyl alcohol by replacing a filter 16 and stores them in a memory 38. A reference image registration part 40 stores a first subject image captured by the imaging control part 42 when a registration mode is set in a nonvolatile memory 36 as a reference image in advance. An ethyl alcohol detection part 44 calculates an ethyl alcohol-containing degree on the basis of the first subject image and the reference image, and a disturbance substance detection part 46 calculates a disturbance degree on the basis of the second subject image and the reference image. A determining part 44 determines the detection or non-detection of ethyl alcohol on the basis of the ethyl alcohol-containing degree and the disturbance degree. <P>COPYRIGHT: (C)2013,JPO&INPIT |
