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Old 01-28-2012, 5:19 PM   #21
GiulianoM GiulianoM is offline
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The software seems to work slightly better on the Mac platform...

Still waiting on my "kit" to arrive.

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Old 01-28-2012, 5:42 PM   #22
Raz0945 Raz0945 is offline
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Following along! It's would be nice to know, instead of guessing, if the LED's are what the sellers tell us. Thank you for doing this!

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Old 01-28-2012, 5:59 PM   #23
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Here's a shot of the software on a Mac platform.


This is part of the "Setup" screen, where you can adjust the part of the camera frame for analysis.

And yes, that's me... The aspect ratio is a bit off.


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Old 01-30-2012, 12:17 PM   #24
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Tagging along. I just may need to build one of these myself. Interesting project.

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Old 01-30-2012, 3:48 PM   #25
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Depending on how the "kit" looks like when it arrives, I may decide to redesign a new box to be made out of 1/4" black acrylic.

Has to be black, because the interior of the box needs to be completely dark - except for the light that it lets in through the slit at one end.


The "kit" project uses a VHS tape clamshell box, with some black paper to opaque the container.

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Old 02-01-2012, 6:07 PM   #26
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Kit

Here's the kit, it arrived today:




Contents:
  • VHS Clamshell box
  • Creative Labs 1.3 Megapixel HD Webcam
  • Black cardstock.
  • Velcro
  • A slice of a DVD-R disk.
The DVD slice acts as the diffuser, to split the beam of light into many slices.

You take the DVD, split the layers apart, and use the lower clear side with the grooves in it, and place it in front of the webcam lens.

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Old 02-01-2012, 6:16 PM   #27
JBDreefs JBDreefs is offline
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So, what your saying is that you have everything figured out and you are going to give us some results!

j/k...

Looking forward to your findings.

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Old 02-01-2012, 6:21 PM   #28
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Quote:
Originally Posted by JBDreefs View Post
So, what your saying is that you have everything figured out and you are going to give us some results!

j/k...

Looking forward to your findings.
You'll get your results, in 6-9 months.


"69 Months?!?!", you say, and I'll repeat "No, Six TO Nine months."

Kowalski, get me a herring.

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Old 02-09-2012, 8:23 PM   #29
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Progress

Making some progress here...

First thing I did was to take apart the webcam, to get down to the circuit board.




Next, I unscrewed and removed the square ABS plastic lens housing.

Using a hot-air heat gun (350F), I heated up the black aluminum lens housing, and un-screwed it from the square ABS plastic housing.

Heat was necessary because the threads of the lens housing were sealed in place using thread lock glue - which loosens up with heat.


At the bottom of the lens was the UV filter, which had to be removed so that the light spectrum wasn't limited to just visible light.


Here's the bare CCD sensor on the board, with the intact UV filter above it.




I re-attached the lens assembly minus the UV filter back onto the board.

Since the lens body had been removed, I had to readjust the lens focus, by screwing the lens body in/out - best done with some heat, and some needlenose pliars.

Here is a shot of the camera board with heat shrink tubing protecting the fragile connector wires.



I followed that up by putting the entire body in some 3/4" heat shrink tubing. I stuck the PCB inside the tubing, shrunk it down some, then cut a hole for the lens.




Covering the board is important - it blocks light from entering the back side of the board, which the CCD sensor will detect as a shadow - I saw shadows from the PCB circuit traces on the back side!


Here's the VHS clamshell box.

I took a chisel and shaved down the plastic bits on the inside of the case.

The wooden block is just a piece of pine, but cut so that the slope is at a 40 degree angle.




The last piece - which I can't easily capture on camera - is a sheet of holographic diffraction material.

Basically, it's a sheet of thin transparent plastic with 500 lines per millimeter etched into the plastic - its purpose is to take the incoming light, and diffract/diffuse it into the seperate bands of color.

I got a 6" x 12" sheet of it, and really onlly need about a 1" square.

That piece of diffraction plastic will go over the webcam lens.


Next, I will cut a slot into the end of the VHS clamshell box, to let the light in - that light will enter the box, and hit the camera lens at the 40 degree angle, and the plastic sheet will split it out into the color bands.

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Old 02-09-2012, 9:57 PM   #30
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You definitely pay attention to the details - now, let's see how it works!

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Old 03-07-2012, 8:47 PM   #31
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Updates

I picked up a SERPAC Project Box from Fry's today, and made some progress.

The box is a black ABS plastic clamshell box, the SERPAC model A42:

http://www.serpac.com/a42.aspx


The top and bottom half are held together by screws, and the front/rear panels are removable.



You can see the pin hole I drilled at one end - this lets the light in.



Back panel, with a notch for the USB cord.




And finally, here is the first real sample - even though the color arrangement is backwards.

http://spectralworkbench.org/spectra/show/126

This was taken from one of my 50W 20,000K LED panels, with the pin hole about 4" away from the LED.


I'll need to open it up and flip the holgraphic diffraction material around so that the color bands go from left to right instead of right to left.

Next is to get a store-brand CFL lamp, and see about finding some Mercury peaks for calibration.

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Old 03-07-2012, 8:55 PM   #32
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Totally awesome progress.
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Old 03-07-2012, 9:11 PM   #33
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Thanks!

It seems like a good first result, even though it's reversed.

However I was expecting some sharp peaks rather than the gradual smooth curve.

I'll pick up a CFL for calibration tomorrow.

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Old 03-10-2012, 11:09 AM   #34
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Calibration Test

Using a 20W 2700K compact flourescent lamp (CFL), I extracted this spectra for purposes of testing the calibration...

http://spectralworkbench.org/spectra/show/142


However, I think the numbers are off, or backwards.

I thought blues were in the 450 range, and reds in the 600 range...


That's not what the calibration test appears to be showing...

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Old 03-10-2012, 11:21 AM   #35
JBDreefs JBDreefs is offline
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Yeah, the graph appears to be backwards. I just estimated where the blues would be if the image was inverted: near the 450 mark. Unfortunately, I'm of no use when it comes to correcting this.
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Old 03-10-2012, 11:42 AM   #36
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Unfortunately I think I goofed up the mounting of the camera - the camera's upside down.

I cut a small piece of aluminum angle, and epoxied it to the inside of the box, but at the wrong angle...

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Old 03-11-2012, 6:17 PM   #37
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Success! Finally...

Success!

I've managed to get the meter moderatly calibrated against a normal CFL - to within 2-3 nanometers, give or take.

Here's the first attempt - this one was wrong because the camera was on the wrong side, and so the colors were reversed.

The angle is 40 degrees from horizontal, and it didn't matter whether the angle was 40 degrees up, or 40 degrees down...

The camera board is zip-tied to a short piece of 1/16" x 3/4" anodized aluminum angle, and the aluminum is epoxied to the ABS plastic case.

The Wrong Way



I went out and got another project box, since epoxied aluminum can't easily be removed from... well, anything.

I cut a new piece of aluminum, shorter this time so it could be mounted further down in the project box - farther away from the aperture.

You can see the aperture at the top, it's a vertical slot, which is then covered by 2 pieces of black posterboard to form a slit's edges, and another two horizontal pieces to form the slit's ends. They're glued on with rubber cement, easy to remove if I hork something up...

The Right Way



And finally, a comparison:




I can bring the meter to the ARC meeting on Tuesday if anybody's interested in checking it out.

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Old 03-11-2012, 7:47 PM   #38
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Have you done a new reading on those 50w chips of yours?
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Old 03-11-2012, 7:50 PM   #39
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I will, shortly...

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Old 03-11-2012, 9:00 PM   #40
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50W 20000K LED Spectrum

And we have our first valid results!

http://spectralworkbench.org/spectra/show/145


It shows three major peaks, at around 455nm (blue), 550 (greenish), and 630 (yellow/orange).


As you can see from the lines, there's a sharp drop off at the beginning 400nm range, so this LED in particular doesn't give off much UV.

Last edited by GiulianoM; 03-11-2012 at 9:13 PM.

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