Everything, ready to go. You get everything you need to experiment with bioimpedance spectroscopy and electrical impedance tomography. Spectra is a highly precise impedance measurement device. The kit includes the pre-tested main PCB with firmware already loaded, tank with 32 electrode flex electrode array, a custom portable enclosure, an electrode expansion adapter to easily connect your own electrode array, USB power and data cable, and a 4-channel gold-plated electrode cable for tetrapolar bioimpedance spectroscopy. You can start performing EIT scans on almost anything, anywhere!
To find out more, see software installation and device tutorials see: openeit.github.io
Features & Specifications
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Precise and highly configurable sensor hardware
- Can be configured to use up to 32 electrodes.
- Measures at 160,000 samples per second.
- Each impedance measure is made using differential referencing and 16-bit resolution.
- Includes automatic temperature calibration to ensure impedance accuracy.
- In-built firmware modes: 1. time series impedance, 2. bioimpedance spectroscopy, 3. 8 electrode EIT, 4. 16 electrode EIT, 5. 32 electrode EIT.
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Built for safety and ease-of-use
- DC power removal filters meet IEC60601-1 safety specifications.
- Compatible with a 3.5 V, 850 mAh battery (not included) for improved portability. On-board circuitry allows charging via the supplied USB cable. Up to 12 hours of battery life, depending on the specific use case.
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Flexible open source software
- Easy to install software supports time series impedance measurements, bio-impedance spectroscopy, and electrical impedance tomography, between 80 Hz and 80 kHz, with up to 32 electrodes.
- Supports three different types of tomographic reconstruction: Graz Consensus, Gauss-Newton Method, and Back Projection. All three can be run in realtime and can be configured with any number of electrodes (e.g., 8, 16, or 32) via changing the mode in firmware. You can record for analysis offline, and run in real-time.
- Hardware includes Serial Wire Debug (SWD) programmers for easy firmware re-programming.
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Portable design
- Tiny, portable PCB measures approximately 2” by 2” and comes with a plastic enclosure.
- Comes with a small, cylindrical tank phantom (140 mm diameter, 60 mm height).
Can I modify the software to suit my application?
Yes! See https://github.com/openeit
This is an open source software project, and we welcome community help and collaboration! Check out the discord channel and forum.
Disclaimer
Be gentle with your Spectra! Avoid spilling liquids on the enclosure that contains the PCB itself, as it was not designed to be waterproof. Nor has it gone through drop testing, so please do not throw it or drop it from a significant height. Follow general electrical safety guidelines when using your Spectra. All usage is at the buyers own risk. Finally, this is a research device and is not intended for medical diagnosis.