-------- In message <[email protected]>, Ron Bean writes:
>And since this is time-nuts: Measuring humidity accurately is tricky. >According to people who have tested them, commercial electronic humidity >sensors, when tested in a lab, have never come anywhere close to the >accuracy claimed in the data sheet. The main problem in measuring humidity is physical gradients: It is incredibly hard to create a volume of homogenous humidity on a planet which has gravity, and for that reason, a lot of labs are not anywhere near as accurate as they think they are. >The exception is the "cold mirror" type of sensor, which measures the >dewpoint by cooling a mirror and bouncing a light off it to sense the >temperature where dew condenses on it. Those are expensive, and they >require maintenance to keep the mirror clean. And they are comparatively slow, last I saw one it could only do a measurement every second minute. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
