Public Lab Research note

The user 'dhaffnersr' has been placed in moderation and will not be able to respond to comments.

Laser Calibration (532nm) of New DVD Diffration Grating 4.7 GB

by dhaffnersr |

Read more:

Resolution and Calibration for the DH 4 v4a Spectrometer

I replaced the DVD diffraction grating for my spectrometer in order to get a more balanced spectral resolution that the JDEPC-OV05 cmos camera can easily process @ its pixel specifications, also I believe with further testing, it will help, since I cannot control exposure time, only gamma correction with Spekwin32.

The new ruling density for the diffraction grating is now; 4.7 GB = 0.74mm @ 1540 lines with a wavelength range of 650nm.

My Aries 532nm Green portable laser was used to calibrate the spectral bandwidth data table is given below;


Figure.1 is the laser line at FWHM, shown on the plot with the horizontal green line at exactly 0.37323[nm]


Figure.2 is the laser peak at 531.39nm (laser allowed to warm up for 1 minute), just shy of the 531.65 central wavelength for this laser specified on it's specifications sheet.


Figure.1a is the CFL calibration I did today using Plab spectral workbench 2, you can see from the title picture, that there is clearly 2 distinct green lines and a clear second blue line, I marked all the lines just for reference purposes.


Figure.2 is a zoomed in view of the second blue spectral line


Figure.3 is a zoomed in view of the double green peaks


Figure.3a is the full plot for the CFL spectrum with a quality "fit" of 7 using the 4.7 GB DVD diffraction grating


spectrometer spectrum-matching spectrography image-compositing image-processing citizen-science field-test spectralworkbench grassroots-science weird-science plots ultraviolet database compact-fluorescent testing spectral-analysis science refinement google google-maps google-earth tests led chlorophyll metadata data-collection data popular-science museum-of-science leds quantitative datalogger civic-science slit-width specification research-notes electrochemical wavelength technique purelab reference hopewell city-point city-point-hopewell-va dhaffnersr david-h-haffner-sr spekwin32 david-h-haffner haffner david ethanol quartz graphs gnu-plot 400nm 400-nm-led technical technical-specs technical-specifications testing-uv-led images-led-testing images-led-testing-400-nm-uv images-test-led-400nm-ultra-violet uv-spectrum-200-400-nm-leds-testing-test-results quartz-cuvettes quartz-cuvette 400nm-led-thru-quartz-cuvette-test electrical-engineering google-search meta-tag meta-tags chlorophyll-testing cool-stuff very-cool-stuff relevant uv-vis uv-vis-ethanol b aspirin uv-vis-chlorophyll dye dyed eosin eosin-y extract portable-laser emission-wavelength wavelengths generic-laser uv-vis-sodium-hydroxide redox width-of-dvd-grating slit-length distance-of-slit bandwidth methylene-blue blank-distilled-water aries emission-wavelength-for-rhodamine-b image-raman-spectrometer google-image-rhodamine-b-samples google-image-raman-spectrometer-homemade plots-spectrometry optical-spectroscopy circular-dichroism-spectroscopy fluorescence-dye photophysik led-testing led-test .


Correction for the data table, R = 531.39/569.8 = 0.93, NOT 1.11

You must be logged in to comment.