Hello everyone,
I would like to be able to compare the color output of several light sources (mainly LEDs) but an off-the-shelf spectrophotometer is (for now) out of the question due to its price.
So the project is to build something that would have a similar result but with a lower cost.
The plan is to use a slit and a diffraction grating, and then to focus the resulting spectre onto a CCD sensor. The basic idea is to use a webcam or a digital camera and then to transform the "jpg" image into a spreadsheed with values for each pixel. The wavelength calibrations and the intensity calibrations can be done by comparing to a known source (the sun for example).
My problem lies in two areas:
1. I am looking for a simple way to transform a jpg file into a spredsheed which can be used by a software like Radiant Imaging's "Color Calculator"
2. Instead of using my digital camera (which I still need for its main purpose - taking photos), or a webcam (sensor might be too small) I thought of using the CCD sensor from an office scanner. I haven't found any way of controlling that sensor without the motor and light that are included in a scanner
so here are my questions: Has anyone here any thoughts about all this? any experience in the CCD-part, or in the picture conversion part?
Thank you in advance
Oliver
I would like to be able to compare the color output of several light sources (mainly LEDs) but an off-the-shelf spectrophotometer is (for now) out of the question due to its price.
So the project is to build something that would have a similar result but with a lower cost.
The plan is to use a slit and a diffraction grating, and then to focus the resulting spectre onto a CCD sensor. The basic idea is to use a webcam or a digital camera and then to transform the "jpg" image into a spreadsheed with values for each pixel. The wavelength calibrations and the intensity calibrations can be done by comparing to a known source (the sun for example).
My problem lies in two areas:
1. I am looking for a simple way to transform a jpg file into a spredsheed which can be used by a software like Radiant Imaging's "Color Calculator"
2. Instead of using my digital camera (which I still need for its main purpose - taking photos), or a webcam (sensor might be too small) I thought of using the CCD sensor from an office scanner. I haven't found any way of controlling that sensor without the motor and light that are included in a scanner
so here are my questions: Has anyone here any thoughts about all this? any experience in the CCD-part, or in the picture conversion part?
Thank you in advance
Oliver
