Bob kb8tq writes:
> I think you will find that things work out a whole lot better if you target
> something
> just above room temp. If your room runs 22 +/- 3 C , a set point of 27C
> likely results
> in better operation than 17C.
This decision should be based on expected abnormal sit
Many years ago, I got some junker DP sensors - the chilled mirror type.
I never did find any specific info on the model, or get around to
figuring out the guts to run them. I can't recall if the support
electronics were missing, or maybe potted, or if I just didn't want to
reverse engineer them
The method still appears to be in use:
http://www.michell.com/nl/documents/Optidew_Vision_97144_NL_Datasheet-V6.pdf
Bruce
> On 24 December 2020 at 14:37 Dana Whitlow wrote:
>
>
> The optical sensing of despoint by dew-on-the-mirror was used in a device
> designed
> at the Whirlpool Research lab
Hi
One of the (many) parts of the EG&G empire made a dew on the mirror
setup and (apparently) sold quite a few of them. It was one of the few gizmos
that could reliably tell you about very low temperature (like -50C) dew points.
Bob
> On Dec 23, 2020, at 8:37 PM, Dana Whitlow wrote:
>
> The
The optical sensing of despoint by dew-on-the-mirror was used in a device
designed
at the Whirlpool Research labs in St. Joseph, MI. It apparently never made
it into
production, but a number of units were built and sold or given away (I'm
not sure).
I know about this because I interned at the lab
You could always use a TEC as the heart of a dewpoint sensor by optically
sensing the temperature required for dew to form on a cooled mirror.
In practice the temperature at which the dew vanishes is typically used.
A collimated light beam together with a photodiode is typically used to sense
the
Hi
I think you will find that things work out a whole lot better if you target
something
just above room temp. If your room runs 22 +/- 3 C , a set point of 27C likely
results
in better operation than 17C.
Bob
> On Dec 23, 2020, at 2:57 PM, ed breya wrote:
>
> This recent TEC talk reminded
This recent TEC talk reminded of some of my long term planned projects,
and related issues. I have at least four "someday" projects involving
TECs, to regulate device temperatures near or below "normal" room
temperature, including a high precision DC voltage standard, a sub-fA
electrometer circ
