Hi, why don't you used a monochrome camera w/o ircut filter? Color sensor camera has unwanted bayer color filters. I want to make something like this by myself, and faced the choice)
Near Slit , What is there ??? Diffraction grating or Mirror ?How to select wavelength for this caase? for example 400-700nm for analytical analysis of chemical solution or dye /Where you had connected DVD Diffraction grading? Have you connected the mirror? At the edge of the slit? Or you have connected in front of the camera-Lens?How to get absorbance -wavelength curve for a cuvette
Hello! Near the slit there is a cuvette for measuring the absorbance spectrum of liquids. But you can also put the cuvette on the outside of the spectrometer in front of the slit. The range of the detected wavelengths can be adjusted by changing the zoom of the objective. I haven't used any mirror in my setup...
@@pikubose7706 no, not with theremino software. First you have to calibrate your spectrum with a known spectrum and take a picture of this spectrum. With the software imageJ you can make a line plot of your spectrum. Then you know the relation between pixel-number and wavelength. The next step is to make a line plot with imageJ with just the empty cuvette or without the filter in front of the slit. You have to save this line plot values. The last step is to make a line plot with the liquid within the cuvette or with the filter in front of the slit. You have to save these line plot values too. Then you upload both line plots values in EXCEL and divide both values to get the absorbance factor. With these absorbance values you plot the absorbance graph...
It's a simple biconvex lens with f = 10 cm. The milky acrylic tube is made of quartz glass is is used for absorption-measurements of liquids ... Cheers stoppi
You can with either a moving prism or a moving grafting film but you need a reliable precise mechanism. You then can even use a photodiode to sense the amount of light instead of a ccd camera. But believe me a ccd camera is way easier to set up. Also you can scratch the bayer filter from the ccd sensor to see the whole spectra. Oc you need quartz optics for that.
Hallo! Nein, es handelt sich um ein Spektrometer für den visuellen/sichtbaren Spektralbereich (400-700nm). Hier findest du mein Gammaspektrometer für Gammastrahlen: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gVxSbSIfDzM.html
@@stoppi I am using white led flashlight for our optical spectrometer but it doesn't show emission lines. What should I do? Also, when I am using the fluorescent lamp for calibration it is not giving the same spectrum just like the others. Very different. Our goal in our optical spectrometer is to show the emission lines obtained from samples like salt and vinegar. But our optical spectrometer doesn't show specific lines.
Hello, Thank you for this excellent video. A few questions for you: 1) how did you attach you zoom lens to the webcam? glue? 2) The Biconvex lens collimator focal distance is measured 10cm from the slit to the edge of the lens? Is the distance from the collimator to the grating important? 3) Is the exterior diffuser inside the film canister used for all light input? Please describe the diffuser construction. It appears the film canister lid has hole cut into it. The hole is covered by the diffusion material and screwed into the canister lid. The canister cylinder then has a pin-hole to allow the light to hit the diffuser. Do I understand this correctly? Is there a material you would recommend for the diffuser? Thank you.
Hello! 1.) years ago I bought plastic adapters on ebay, which connect the lens with the Webcam board. You can see this black adapter in the video. 2.) the collimator lens with the focal length f (f.e. 10 cm) had to be positioned in the distance f to the slit to create parallel light beams through the grating. The distance between the collimator lens and the grating should be chosen as short as possible to avoid light losses. 3.) I use a film cannister for examining the spectrum of LEDs. With this construction only the light of the LED reaches the diffusor inside the cannister. You don't need the film cannister if you work in a dark room. Then no foreign light disturbs your measurements. The diffusor is made of a white/milk plastic plate, to lighten the whole slit equally. This is useful for laser light sources. Otherwise you would get just a spectrum line and not a band... Thanks for your good questions and good luck with your project
@@stoppi Hello again. I am waiting for a few components to arrive and would like to pick your brain for a couple more things. 1.) what informed your choice for the 10cm focal length lens? was simply the designed size of the unit? 2.) mid-way down the webpage in the description there is an image of the whole unit assembled and labeled. What is the purpose of the wires tucked behind the webcam? They appear to be connected near the lens on the chip board in earlier photos. 3.) I plan to use the same Logitech webcam featured in your build, but I also have a spare Logitech C525. Only downside is the lower max resolution. Do you think this webcam would be suitable for a 2nd unit? 4.) My intention for replicating your design is an affordable way to measure Near-Infrared wavelength and intensity. Obviously I will need to remove the IR filters. Do you have any other tips or advice for measuring 800nm+ NIR spectrum? Thank you for your time :)
Hello! 1.) I found the lens (collimator) in my lab and it has a suitable focal length and diameter. 2.) the second wire of the Webcam is connected to a push button for taking single pictures. I don't use it because there is also a button for pictures/videos in the Logitech software on the PC. 3.) I would use your second Webcam for a spectroscope with a simpler setup (f.e. No collimation lens) 4.) for IR-spectrum you will need to remove the ir-filter in front of the sensor
