Breathalyzers
are the most common judges of a suspected impaired driver’s blood alcohol
content (BAC). How they get results is a science unto itself.
According to BACtrack, a breathalyzer manufacturer
based in San Francisco, breathalyzers use one of three systems: semiconductor
oxides, fuel cells, and infrared spectrometry. Fuel cells are widely fielded by
law enforcers on the road due to their high accuracy and portability (even
though the results can be somewhat less reliable). Infrared spectrometry, on
the other hand, is normally used at police stations or labs.
Semiconductor
Oxide
A semiconductor oxide sensor generates readings by
detecting the amount of ethanol present in a person's breath. Metal oxides like
silica, copper oxide, and tungsten trioxide are highly sensitive but affordable
enough for personal use. You can buy one and carry it with you on your night
out to keep you informed of your BAC.
Fuel
Cells
Fuel cells are more accurate than metal oxides as they
can't be fooled by non-alcoholic sources, unlike semiconductors. A fuel-cell
breathalyzer normally comes with a pair of electrodes that oxidize alcohol and
produce an electric current. BAC readings, in this case, depend on the output
the electrodes produce.
Infrared
Spectrometry
Due to their size and weight, infrared spectrometry
breathalyzers usually stay at the station or labs. This is the most accurate
way of determining BAC from a person’s breath.. By observing how molecules
absorb infrared light, they can identify which of the molecules belong to
ethanol.
Seth Blum is an experienced DWI attorney in Raleigh,
NC. To contact him with questions about
your case please call 919-832-7700 or visit www.KurtzandBlum.com
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