🚀 go-pugleaf

In article <86134@ut-emx.uucp> lihan@ccwf.cc.utexas.edu (Bruce G. Bostwick) writes:
>In article <1993Jan4.134028.27684@phx.mcd.mot.com>,
>schuch@phx.mcd.mot.com (John Schuch) writes:
>|>In article <1993Jan4.002944.6494@sequent.com> washer@sequent.com (Jim
>"Throw it over the wall" Washer) writes:
>|>>I'd like to mount a temp probe on my car to sample the air temp. I'd like
>|>>to get as accurate a reading as possible (without exceeding some reasonable
>|>
>|>I think I'd try either in the trunk, or inside one of the tail-light
>|>assemblies first. At sixty miles per hour, the airstream hitting the
>|>sensor will cool it nearly as much as being wet. You need to find
>
>BZZZT!   He _wanted_ the air temperature -- which means he _wants_ _maximum_
>"cooling" of the sensor.
>

Excuse me but if you cool the sensor by placing it in an airstream, your
not reading the actual temperature of the air. Reading a sensor cooled
by an airstream, by itself, tells you nothing. If you measure one sensor
in an airstream and another one nearby but shielded from the air stream,
you can determine the speed of the airstream. Other than that, I don't
know why you would want to cool the sensor.

You will note that weather stations keep the thermometer in a little
louvered box to break-up the wind. Even high-end indoor/outdoor
thermometers include a little shell to place over the external
sensor.

John



-- 
+--------------------------------------------------------------------------+
| John R. Schuch  -  Motorola Computer Group  -  Manufacturing Engineering |
| N7XVS - schuch@phx.mcd.mot.com - (602) 438-3008 - CompuServe: 70733.3330 |
+--------------------------------------------------------------------------+