Public Lab Research note


The user 'dhaffnersr' has been placed in moderation and will not be able to respond to comments.
  • 0

Empirical Verification Of 0.05mm Slit Width of DH4.0 v4 Spectrometer

by dhaffnersr |

Understanding Spectral Bandwidth and Resolution in the Regulated Laboratory

Upon closer scrutiny of my microscopic view of the 0.05mm slit width, I realized that the edges did not meet. This caused me great concern, although the measurements are correct as far as pixels go, on the title picture, (measuring from the razor's edge to the shadow of the lights edge from the bottom razor blade,) I re-examined my plots for the two laser scans I did recently and decided to isolate the green laser, as I had used it for calibrating my spectral bandwidth.

My laser that I use, is NOT some cheap off the shelf type, I have given its specifications several times in detail before, it is highly reliable and very stable monochromatic light source. There are two graphics below, the first one, explains how to determine spectral bandwidth and slit width, the second plot is mine, from the other day when I scanned both of my lasers, the 405nm uv laser pointer and the 532nm green laser.

spectral_bandwidth_chart_sept_9.png

532nm_lasers_sept_9_531_532_cutoff_slit_width_view.png

As is discussed in the data, I actually have a slit width of 0.5mm. I know what the problem is. I used construction paper to mount the two razor blades edge to edge, this is causing a slight bending effect, which can be seen in the title picture. The two edges are not meeting perfectly, so I am working on another one, where the mounting template will be more ridged and stable, and then I will re-verify that the edges do indeed meet and align.

Reference is below:

http://www.analiticaweb.com.br/newsletter/02/AN51721_UV.pdf - Understanding Spectral Bandwidth and Resolution in the Regulated Laboratory



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 .

category:verify

0 Comments

You must be logged in to comment.