Capacitance Test
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More Fun Than a Blood Test: Researchers Want Diagnosis To Be as Simple as Spitting On Your Screen | 80beats (Discover Magazine)
**What's the News:** If two South Korean researchers have their way, the days
of needing specialized equipment to test whether someone has strep, the flu,
or other common illnesses may soon be numbered. The pair want to check for
disease markers in a tiny drop of a bodily fluid by pressing it against a
touchscreen, so your diagnosis could come straight from your smart phone.
While there's no app for that yet, the scientists recently finished a proof-
of-concept study showing that a touchscreen could differentiate between
various concentrations of bacterial DNA--a first step towards diagnosing your
disease by spitting on your iPad.
**How the Heck:**
Touchscreens like those in smartphones and tablets work by detecting changes
in capacitance, or how much electric charge a material can store. When you're
using your phone, the touchscreen senses the relatively large capacitance
change of fingertip vs. no fingertip. But, the researchers knew, touchscreens
can detect much smaller differences. Using screens to measure the capacitance
of a bodily fluid droplet could reveal the sample's contents, they
hypothesized, since the type and amount of a pathogen would change a fluid's
capacitance in a particular way. To test ...
Induction motor capacitance TEST BOX Part 3