The specifications given by the decisions of the design are:
- Spectral range: 380-760nm
- Resolution: ~2nm
- Integration time: 10µs-36min
- Frame-rate: ≤ 1Hz
[1]: In fact the CCD is slightly underfilled so the range extends slightly beyond 380-760 nm, but because there are no sorting filters, 2nd order diffraction will start to overlap from around 760nm.
[2]: The resolution will depend strongly on the build quality. Read more in the spectrograph design section and/or below.
[3]: While the firmware for the MCU is capable of integration times up to 36min, the CCD’s dark current makes any integration longer than 1s impossible without cooling.
[4]: The frame-rate is naturally dependent on the integration time, but the real bottleneck is the UART-transmission speed. Transmission of a full CCD takes at best 642 ms.
Being an advanced IKEA-project the OtterVIS LGL spectrophotometer’s specifications will wary depending on how well it’s assembled.
I can think of the following obvious parameters that will influence the resolution of the spectrometer:
- Slit width and quality
- Alignment and focus of the slit
- Alignment and focus of the CCD
OtterVIS spectrophotometer 