Re: Sky Quality Meter

["Richard Miles" <rmiles.btee@btinternet.com>]

Doug,

The features listed on the website do not quote the acceptance angle of the 
lightmeter.  Can you say what the size of the acceptance cone is?  I imagine 
it subtends about 30 degrees or thereabouts.

Thank you,
Richard Miles

----- Original Message ----- 
From: "Doug Welch" <welch@physics.mcmaster.ca>
To: "TASS List" <tass@listserv.wwa.com>
Sent: Monday, June 13, 2005 5:07 PM
Subject: Sky Quality Meter


>
> Folks,
>
> Anthony Tekatch and I have developed a sensitive, handhelp meter for 
> measuring the
> brightness of the night sky. Please visit the webpage below and read the 
> FAQ if you would
> like to know specifics. (Of course, I would be happy to answer questions 
> off-list, too!)
> This seems like the sort of thing TASS folk might be interested in, so I 
> hope you'll forgive me for
> posting it here. Feel free to pass it along to anyone else that you thing 
> might be interested!
>
> Cheers,
> Doug
>
> =========================================================================
>
> We wish to announce the availability of a reasonably-priced,
> handheld meter for measuring the brightness of the zenith
> sky at night. This meter displays the surface brightness
> of the sky in visual magnitudes per square arcsec and can
> be used at even the darkest sites to obtain precise
> measurements. It is ideal for light pollution studies and
> site selection.
>
> Use of the "Sky Quality Meter" is simple - point it at the
> zenith, push the single button once, and the sky surface
> brightness appears on the LED display.
>
> The "Sky Quality Meter" contains a very sensitive, solid-state
> light sensor which is interfaced with a microcontroller
> and temperature sensor to correct for temperature-induced
> changes to the microcontroller oscillator and the sensor
> dark current. An infrared blocking filter restricts the
> sensitivity of the device to the visual bandpass. The meter
> is designed for long battery life and automatically shuts
> itself off after making a measurement.
>
> For additional features and ordering information please
> visit the webpage:
>     http://www.unihedron.com/projects/darksky/
> A mailing list has been formed for SQM users.
>
> Individual units sell for US$79.99 plus shipping.
> (A 9V battery *is* included!)
>
> We look forward to your potential orders!
>
> Anthony Tekatch, Unihedron
> Lawrence Ave.
> Grimsby, ON   L3M 2L9
> CANADA
>
> Tel: (905) 741-9458
> E-mail: sales@unihedron.com
>
>
>
>