The dDOS (digital diffuse optical spectroscopy) Spectrum Analysis Unit (dSAU) is a device being developed for Professor Darren Roblyer and the ​Biomedical Optical Technologies Lab (BOTLAB). It will aid in his research in the use of diffuse optical spectroscopic imaging for monitoring the effects of chemotherapy on cancer cells. The device must be able to simultaneously create six frequency sweeps that will modulate external laser drivers through user specified frequency ranges between 50 MHz and 400 MHz. Secondly, the dSAU must also be able to measure two waveforms, one from the aforementioned output and the other received from an external amplified photodiode that will measure the light scattered off the tissue from the modulated laser at a point. Furthermore, the Analyzer must communicate this waveform information to a PC running custom software for recording and visualizing the data. This software must also be able to set frequency sweeps and otherwise control the Analyzer. In order to meet these goals we designed custom printed circuit board(s) with six direct digital synthesizer chips for producing the output waveforms, a two channel 14 bit 250MSPS ADC for measuring the inputs and a ​Zynq SOC (ARM + Artix-7) with custom firmware and running Linux for controlling these devices and communicating with the PC. We also developed custom PC software written in Visual C++ 2010 and designed to work on Windows 7. All communications use 1000Mbps Ethernet over copper and are platform agnostic.

This project was carried out as a part of an ECE Senior Design Project for the class of 2014.

Revision A

Hardware

Motherboard

Frequency Synthesis Daughterboard

Firmware

Software

Reports and Other Resources

Developers

Current Developers

• Dan Gastler, Primary Maintainer and Developer
• Eric Hazen, Overseer

Senior Design Project Team

If the original team is to be contacted please contact the new maintainers first. Eric Hazen or Dan Gastler can redirect questions as needed.

• Christopher Woodall (chris.j.woodall <at> gmail.com), Motherboard PCB Designer & Primary Support Contact
• Thomas Nadovich, Frequency Synthesis PCB Designer
• Benjamin Havey, microZed-Zynq Firmware and Software Developer
• Caroline Ekchian, PC Side Frontend Developer
• Andy Mo, Server-Client Communications Developer