1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 0

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 1

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 2

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 3

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 4

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 5

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 6

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 7

1/4 meter Scanning Monochromator LOW LIGHT SCATTER DESIGN, US $456.00 – Picture 8

1/4 Meter Scanning Monochromator Low Light Scatter Design

US $456.00

Champaign, Illinois, United States
Jan 29th

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1/4 meter Scanning Monochromator This is a LOW LIGHT SCATTER DESIGN monochromator using two gratings in succession one after the other. (see optical path pictures) It is basically a Czerny-Turner design with the addition of a second grating. This also doubles the dispersion. The two gratings have light baffles between them to reduce light scattering and stray light. The two gratings are mechanically linked and move in unison. RESOLUTION = 0.23 nm (see discussion below) DISPERSION = 0.9 nm/mm (see discussion below) Spectral Range = 370 to 740 nm (see pictures) SLITS = 0.01" OR 1/8" All of the internal optics are 1 inch diameter. 2 mirrors and 2 gratings. FOCAL LENGTH = 9 INCHES = 0.23m = The first mirror is 9 inches from the input slits. F/# = F/9 Dimensions; 12 X 7 X 8 inches Weight = 13 lbs It looks like the monochromator is in calibration. I used my eye on the narrowest output slits to view these neon lamp lines. Here are some of the Neon lines in angstroms and the corresponding monochromator counter readings. Angstroms Counter 5341.0938 = 534 5400.5617 = 540.5 5764.4188 = 577 5852.4878 = 585.5 5944.8342 = 595 6074.3377 = 608 6096.1631 = 610 6402.246 = 641 6506.5281 = 651 DESCRIPTION OF THE SPECTRUM PICTURES; I took spectra images to show the capabilities of this monochromator. For spectrum, there are two wavelength regions. One on the top and one on the bottom. This way shows higher resolution than one long spectrum picture would. The top row is the wavelength scale in nanometers along with the some of the elements responsible for some of the solar absorption lines. The second color row is someone else's sun absorption spectra I used for aligning my images. The third row is my solar absorption spectrum. Since my CCD would only cover 37nm at a time, I stitched multiple 1 second exposures together to make this spectrum. The forth row is the Neon spectrum collected similarly. The bottom row is color is someone else's. Note my Neon spectrum 604 nm to 641 nm shows one single CCD frame. The others got truncated when stitching them together. I also included one high resolution picture 616 nm to 449 nm. Absorption lines are not detectable in my CCD pictures below 370 or above 740 nm. I believe that the lines above 740 are second order grating lines from 370 nm. Close-ups of all the optics are shown in 4 pictures. I added the American flag to show the 2 mirrors reflections. 2 other pictures show slit and grating 1 and 2. I used a 15 foot long fiber optic cable to bring the sunlight into the monochromator. I simply pointed the outside end of the cable at the sun and put the inside end directly in front of the spectrometer slits. For Neon, I placed a neon panel lamp directly in front of the slits. To record the spectra, I removed the output slit from the monochromator. I used a lens to transfer the monochromator output into the CCD. The lens was 3 inches from the monochromator image exit and 5 inches from the CCD. That gives an image magnification of 5/3. My CCD camera has a detector size of 24.5 by 24.5 mm and 1024 by 1024 pixels. Based on my recorded spectrum, my CCD camera covered 37 nm. So that is a dispersion of 37 nm / 24.5 mm. By removing the lens magnification factor, I get 37nm/24.5mm X 3/5 = 0.9 nm/mm monochromator output dispersion. Since the smallest output slit is 0.01 inches = 0.254mm, then the monochromator resolution is 0.9 nm/mm X 0.254mm = 0.23 nm There is a funny little arm (removed for shipping but included). This arm intersects the input beam and moves up and down depending on the wavelength. This up and down is adjustable for various wavelength regions using the brass ring on the top. I think it was used to correct for the spectral response of the light detector using some kind of optical neutral density filter wedge. (not included) There was no documentation with this monochromator so I don't know what the gratings lines/mm are. Maybe if you are smarter than me, you can calculate it from the specifications given above. To change the slits, you open a little hatches on the top and rotate the smaller slits into the optical path. To make this monochromator scan, an additional motor (not included) must be attached to the grating rotator gear train. Even though there is a red high voltage warning label on it, there are NO electrical connections to this monochromator. I think this warning refers to the high voltage supply to a photomultiplier tube detector which I do not have. SHIPPING COSTS INCLUDE INSURANCE

Condition	Used : An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections.
Seller Notes	“As seen in pictures”