I would like to investigate the colourimetric properties of human eyes. The OneLight Spectra is ideal for this. Unfortunately, it has not been sold in Germany for over 10 years and the OneLight Corporation no longer exists. For my investigations, I would have to modify the control software somewhat, for which I would need the "source code". Most of it is written in LabView.
In addition, I have not yet been able to get the software to work properly on newer operating systems. The colourimeter supplied by Ocean Optics refuses to run at the same time as the actual Spectra hardware. I hope that I could also fix this problem by changing the source code. Perhaps it would even be possible to run the entire system on a current operating system. So far I am using WindowsXP in the Virtual Box.
I would be grateful for any hints. It would also help me if someone knew someone who could help me.
Best regards,
Christian Greim
You could use a commercially available system called Spectra X from Lumencor. Since you need to investigate human vision, you could also build a system at home by selecting a certain number and type of LEDs, controlled with a microcontroller. It would be straightforward and highly customizable. If you'd like, I can help you with that.
I fear that there is no one who will donate me such a system. As far as I understand from the somewhat unsystematic description, LEDs with fixed light emission characteristics are used, as can be seen at https://lumencor.com/resources/solid-state-illumination-light-engines-for-photoresponsivity-characterization. This is absolutely not what I need. With my old OneLite Spectra, I have a daylight-like light source where I can choose exactly which wavelength I need and at what intensity via DLPs. Thanks anyway for the tip.
Yes, I thought you needed a system to obtain a color of a given composition perceivable by the human eye (which is not a spectrometer). The SpectraX system is equipped with 8 different LEDs (ranging from 395 nm to 747 nm) that can be turned on/off, resulting in a combination of colors, also varying the power level of each one. It's not my field of study, but I am very curious about your application. Let me ask you a question: for the human eye, is a discretized light spectrum the same as a continuous spectrum? In other words, if you discretize the continuous spectrum with a certain number of steps, wouldn't the result be the same? Having a spectrum ranging from 510 nm to 555 nm, with all the intermediate frequencies, wouldn't produce the same effect as having a spectrum with two peaks at 510 nm and 555 nm? There's only a 45 nm difference between the two.
You are quite persistent. With the OneLight Spectra, the narrowest spectrum with a peak that I can produce is about 20 nm wide. That's actually already too wide, but I can push this spectrum to almost 1 nm exactly where I need it. So I can pretty much create a spectrum the way I want it without having to rely on the emission curve of individual light sources.
This issue you raise "Having a spectrum ranging from 510 nm to 555 nm, with all the intermediate frequencies, wouldn't produce the same effect as having a spectrum with two peaks at 510 nm and 555 nm?" is part of the problem I want to investigate.
Unfortunately, the light source you offer really doesn't help me. I am really looking for the "source code" for my old OneLight Spectra, or a device that can really do exactly the same as my old device. However, in terms of sustainability, it is annoying to replace a functioning device with a new one only just because you can't get the software.
Thank You again for Your Tip,
Christian Greim
- Badges
- Science topic
- Similar topics
- Phytochemistry
- Extracts