Show HN: A large format XY scanning hyperspectral camera
9 days ago
- #spectroscopy
- #hyperspectral-imaging
- #DIY-camera
- A hyperspectral camera captures spectral data for each pixel.
- The project involves a 200um fibre optic cable attached to a spectrometer moved in X and Y axes behind a large format camera lens.
- Uses the colour-science.org library to create RGB images from spectral data.
- Components include a Sinar 4 x 5" camera, Scheider-Kreuznach Symmar-S 240mm f5.6 lens, and Broadcom AFBR-S20M2WV spectrometer.
- 3D printed parts were designed in OpenSCAD and printed in PETG for mounting stages and fibre cable.
- Stepper motor control is managed by a Raspberry Pi Pico with TMC2130 drivers, controlled via USB UART commands.
- Images were captured with long exposure times, resulting in large data files (6.8GB for 400x400 pixels).
- Noise reduction techniques included averaging intensity from multiple wavelengths.
- Experiments with different light sources (UV, LED) showed varying spectral responses.
- Future improvements include trying different pinhole sizes, fibre widths, and longer exposures.