Building an accurate DIY Spectroscope
9 هزار بار بازدید -
4 ماه پیش
-
In this video we use
In this video we use a camera that's capable of saving RAW pictures and an analogue / pocket spectroscope to create a DIY digital spectroscope. On the way we talk about many topics that affect our results, including color filter arrays, lenses, etc ...
Our spectroscope is limited to the visible range (even a bit less, to roughly 425nm to 675nm) and it's not going to be as accurate as commercial devices (but way more accurate that all other videos I've seen on the same topic!). However, we will calibrate it carefully so it should be reasonably accurate.
I've seen a few other videos about the same topic but in my view they all have issues. First, many videos just parse data from a JPEG. That may be fine to measure the smooth spectrum of a lamp but once you turn it at the sky your spectral lines will not be very accurate (why? check out the video). Second, at least one that I've seen uses a monochrome camera but they don't account for the efficiency of the diffraction gratings so the intensity of light they measure across the spectrum won't be right (also, who's got access to a monochrome camera?). This seems to be a general thing, the videos I've seen normally calibrate the spectroscope to give accurate wavelengths but they don't usually calibrate the intensity of the light. Moreover, I haven't seen any tests indicating how accurate their results are ... in this video we try to do better by going through the whole process of creating and calibrating a reasonably accurate spectroscope!
More details can be found on the blog post under https://mpr-projects.com/index.php/20.... The code can be downloaded under https://github.com/mpr-projects/DIY-S.... An example of the sun's spectrum can be found on Wikipedia https://en.wikipedia.org/wiki/Fraunho....
Our spectroscope is limited to the visible range (even a bit less, to roughly 425nm to 675nm) and it's not going to be as accurate as commercial devices (but way more accurate that all other videos I've seen on the same topic!). However, we will calibrate it carefully so it should be reasonably accurate.
I've seen a few other videos about the same topic but in my view they all have issues. First, many videos just parse data from a JPEG. That may be fine to measure the smooth spectrum of a lamp but once you turn it at the sky your spectral lines will not be very accurate (why? check out the video). Second, at least one that I've seen uses a monochrome camera but they don't account for the efficiency of the diffraction gratings so the intensity of light they measure across the spectrum won't be right (also, who's got access to a monochrome camera?). This seems to be a general thing, the videos I've seen normally calibrate the spectroscope to give accurate wavelengths but they don't usually calibrate the intensity of the light. Moreover, I haven't seen any tests indicating how accurate their results are ... in this video we try to do better by going through the whole process of creating and calibrating a reasonably accurate spectroscope!
More details can be found on the blog post under https://mpr-projects.com/index.php/20.... The code can be downloaded under https://github.com/mpr-projects/DIY-S.... An example of the sun's spectrum can be found on Wikipedia https://en.wikipedia.org/wiki/Fraunho....
4 ماه پیش
در تاریخ 1403/03/03 منتشر شده
است.
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