Alternative chemical sensors, such as webcam spectroscope

rsevs3

katonafull wrote:

Every complicated things begin like an easy idea.
/ The ball point pen is a hungarian invention

)) /
and the complicated thing sometimes convertabled to an easier thing.
I will try this sensor, if i have free time.

I believe in the creative power of mind, and I also know that nothing is impossible.
Although I know that almost no chance, so i need a lot of perseverance, encouragement, spiritual and mental support, including the negative criticism.

But i never will accept the expressions like: it won't succeed.

If it don't work with Nh3/4, No3...it will work with iron...or anythíng

I will try it, and if it won't work, i played a good one, and i win some experience.

If you see, tell what the mistake in the plan, but please don't emit negative energy. Thanks!

What negative criticism? I very much want this to work. It has +100000000 cool factor. (Im not sure what number that is, my eyes blur about half way through counting them, but its alot :wave1:

)

The link i was talking about was this one posted by Dui (I thought it was posted by katonafull):

http://animalscience.ucdavis.edu/faculty/mitloehner/publications/2005%20Webber%20Agr%20ammonia.pdf

Which they seem to be measuring ammonia in the air. A simple statement about a document that could well be very helpful in giving your project a head start.

With regard to my comment about determining the composition of the atmospheres of other planets, wath this video and tell me it isnt complex!

http://www.ted.com/talks/lang/en/garik_israelian_what_s_inside_a_star.html

Is your project going to be this hard? No. But it is still going to be a fairly complex project. Especially on the data processing. My guess is that getting the picture will be the easy bit. However, you can bet your bottom dollar that i want it to work.

Finally, having reread my post i dont know how you got 'negative energy' from it. But then i am the original poster and am reading i how i intended it. Appologies if that is how it came across. The same for this post, it has been an extrememly busy few day at work and my brain is unwinding. Mmmm beer :occasion5:

DuiNui

I don't think "negative criticism" was aimed at anyone in particular.
But for sure it's gonna be a hard thing to do.
Hard in a University with all the resource.
And perhaps "impossible" in a hobby workshop.

katonafull

hooked wrote:

I agree with you katonafull. Good luck.

Can you explain what you meant by 'the chemicals, that we want to measure aren't show optical effect like light absorption.', do you mean in the visible region?

I thought all elements had a spectra as the spectra relates to the elements interaction with light.

Hmm...I don't know.
I asked a teacher in the university about that, and he answered that...NH3 / 4, NO2, NO3 don't show light adsorption...

That's why i would have a table, that contain the light absorption of the materials...

katonafull

DuiNui wrote:

Well yes.
But my point was that would you really want to be playing around with a self modified microwave?
This years blockbuster movie from Thailand...
"Honey I Cooked the Kids"

katonafull

rsevs3!

Quote:

What negative criticism?

Ohh, yes, i aimed the: never won't work attitude.
And I want to highlight the importance of the constructive, negative criticism.
Because we need negative criticisms to the development.

This notice said not to you.

DuiNui

katonafull wrote:

Hmm...I don't know.
I asked a teacher in the university about that, and he answered that...NH3 / 4, NO2, NO3 don't show light adsorption...

Hmmm, I am 43 and something I learned a LONG time ago.
Teachers don't know everything, in fact generally speaking they know very little, just what their syllabus involves.

I was in first year college electronics and I asked my tutor, "What is it about the construction of CMOS gates that requires the pulling up (or down) of an unused input"?
His answer:
"You don't, it's not necessary"
I quit the course 2 weeks later, he knew everything there was about how to calculate the forward gain of a transistor, but nothing about how to use one.
:upset:

DYOR

Rant over...

katonafull

This is the reason of that i want to try it.

I know a teacher, who didn't want to accept my school excercise, because i use the star-delta transformation in a resistance calculation.

He didn't know that reduction

))
Than i explained to him, why equals my result with his result.

)

I just found out ... I ask my astronomer acquaintance

katonafull

I find a softwear that shows the spectrum of the elements!!!

It really won't be easy

http://www.freshney.org/education/pte/p ... r_full.exe

katonafull

katonafull wrote:

I find a softwear that shows the spectrum of the elements!!!

It really won't be easy

http://www.freshney.org/education/pte/p ... r_full.exe

I'm stupid it isn't light adsorption spectrum...

but maybe it will be usefull

rsevs3

This is interesting.

http://biomath.ugent.be/~peter/ftp/pvr766.pdf

Need to find some info on the sensor and whether it can be made at home

DuiNui

Nice article, shows it's possible.
We need a double agent to get a job there (the sensor manufacturer) and steal one so we can copy it

rsevs3

*James Bond theme starts in head*

I'll go and get my suit

rsevs3

A few more articles along the same lines.

http://www.s-can.at/medialibrary/publications/p_2006_03.pdf

This is the light source they are using in the in situ spectrometers

http://www.msscientific.de/fiberlight_gb.htm

according to

http://www.chemeurope.com/en/news/22526/continuous-water-analysis-using-in-situ-uv-spectroscopy-featuring-a-miniature-deuterium-lamp.html

Only 675 euros

Probably not something you would pick up on ebay :think:

katonafull

Do you know the UV/VIS technque?

rsevs3

From the bit of reading i have done, they use that light source, bounce it off a mirror and back into some fiber optics into a magical black box that gives out a reading

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