Purple/blue laser for soap particle backscatter testing?

[Tony]

I've always wanted to build a solid state coil, small but perfectly formed (and tuned!)

IIRC half the battle was tuning the secondary to 1/4 wavelength.

[julesandtash]

Bob, could you build one of the music playing solid state ones?

That would be soooooo cool at the BBB, we could have musical arcs to keep us entertained (providing the music wasn't drowned out by the noise from the generator of course)

[Rotary-Motion]

been a while since i read this one, blast from the past

 

bots are interested, there like virtual people, me buddies lol

[Tony]

Oh I tried a green laser for soap backscatter, it was no better than the red so it got sold on.

[nathanrobo]

Does this work?

I didn't like soap testing, too fiddly and seemed like results were a little subjective?  How does this method compare?

[Head Womble]

Does this work?

I didn't like soap testing, too fiddly and seemed like results were a little subjective?  How does this method compare?

I think it would be good to do some tests at the BBB,
if we all bring a small sample (50ml or so) of our bio we could start with the laser test,
maybe marking it 1 to 10 for clarity,
then do a titrated soap test,
we may be able to draw some usefull conclusions from it.

Even if it is that there is no correlation between the two.

This does however rely on Nige being able/willing to do the titrated tests.

[Tony]

For me it shows the difference between clear water layer but with some soap present and crystal water layer with very little soap present, which is otherwise hard to quantify.  It also avoids the effect of bubbles of bio stuck to the sides of the glass in the water layer, which can make it look soapy when in fact it isn't.

[greasemonkey]

Would infra red or ultra violet show up soap particles?

[nigelb]

Does this work?

I didn't like soap testing, too fiddly and seemed like results were a little subjective?  How does this method compare?

I think it would be good to do some tests at the BBB,
if we all bring a small sample (50ml or so) of our bio we could start with the laser test,
maybe marking it 1 to 10 for clarity,
then do a titrated soap test,
we may be able to draw some usefull conclusions from it.

Even if it is that there is no correlation between the two.

This does however rely on Nige being able/willing to do the titrated tests.

An interesting quote there regarding the subjectivity of soap testing. I suppose it's all down to how accurate you are with the kit you use. If you're a bit heavy handed, clumsy or have a degree of colour blindness then you're always going to struggle. I've never suffered from these conditions and found that titrated soap testing is by far the most accurate method currently available.

However, it would be interesting to perform some comparrison testing with lasers and I'd be quite willing to help. I could bring all my kit if you wish and have a little play before I consume too much falling down fluid!!

[Head Womble]

Great stuff Nige, I'll bring a sample or two.

I think I still have some of the samples I sent you, so I'll bring them as well.

[Head Womble]

Tony I assume it's best done in a glass jar, is that right ?

[Tony]

Yep glass jar in the dark, in daylight it's not going to work.  I have a pile of little glass sample jars if necessary.

I find the 50:50 a very quick and easy test, and it saves titrated test chemicals - I use Nige's titrated test as a backup for when I'm not sure about the 50:50 results.

[Head Womble]

Yep glass jar in the dark, in daylight it's not going to work.  I have a pile of little glass sample jars if necessary.

I find the 50:50 a very quick and easy test, and it saves titrated test chemicals - I use Nige's titrated test as a backup for when I'm not sure about the 50:50 results.

I see a problem here, by the time it's dark me, you, and many others may not be able to see the results very clearly.
Or anything else for that matter.

[Julian]

Yep glass jar in the dark, in daylight it's not going to work.  I have a pile of little glass sample jars if necessary.

I find the 50:50 a very quick and easy test, and it saves titrated test chemicals - I use Nige's titrated test as a backup for when I'm not sure about the 50:50 results.

I see a problem here, by the time it's dark me, you, and many others may not be able to see the results very clearly.
Or anything else for that matter.

One of you may no longer be there at all!

[Head Womble]

Yep glass jar in the dark, in daylight it's not going to work.  I have a pile of little glass sample jars if necessary.

I find the 50:50 a very quick and easy test, and it saves titrated test chemicals - I use Nige's titrated test as a backup for when I'm not sure about the 50:50 results.

I see a problem here, by the time it's dark me, you, and many others may not be able to see the results very clearly.
Or anything else for that matter.

One of you may no longer be there at all!

Why, what's happening to Tony ?