Hi "Ole Bob", Yes, I understand the need for a nice coherent beam if a person is going to eyeball it for the Tyndall effect.
I was thinking more along the lines of having red,green and blue LEDs on one side of the cell and light sensors on the other side to measure the light transmission changes for each wavelength. Based on some of the thoughts expressed on this list,it seems we would expect to see changes in blue first,then green and finally,red. Perhaps one might wish to stop brewing when a certain reading in green or red is reached. This might give a qualitative spin on the conductivity readings. Plotting conductivity versus Tyndall readings for a brewing run might show something interesting. I have been keeping samples of each batch to check conductivity and Tyndall effect over time as I seek to stabilize my process and if this idea is workable, I could also check to see if there are shifts in wavelength readings over time. If there is a shift to higher readings in the green and red wavelengths,and the blue readings go down, this might tell us something about the changes in particle size as related to storage containers,light exposure, etc. Just thinking out loud, does anyone else have an interest in this sort of thing? David ----------- "Robert L. Berger" wrote: > > Hi Blue eyes; > > One needs laser diodes for this purpose and they come in 635 to 685 > nanometers which is in the IR zone. NEC manufacture on page > 54 of Mouser cat. > > I t might be possilbe to rig up a set of optics to focus the beam from a > standard diode but it wont be simple. > > So the hunt is still one for other color laser diodes. > > "Ole Bob" > > > s > > -- > The silver-list is a moderated forum for discussion of colloidal silver. > > To join or quit silver-list or silver-digest send an e-mail message to: > [email protected] -or- [email protected] > with the word subscribe or unsubscribe in the SUBJECT line. > > To post, address your message to: [email protected] > Silver-list archive: http://escribe.com/health/thesilverlist/index.html > List maintainer: Mike Devour <[email protected]> -- E-mail: [email protected] Fax to: 1-253-681-1133 ICQ#... 44960928 _____NetZero Free Internet Access and Email______ http://www.netzero.net/download/index.html
