Category: Lab Updates

Lower noise frequency-domain measurements with new preamp

in Lab Updates

Raeef took new measurements with a much lower noise preamp made by the Boston University Electronics Design Facility (EDF).  Below is a drift measurement (60 repeated measurements every minute for 1 hour) with an 850nm laser diode, taken from 50-500MHz on an optical phantom with a 3mm APD.  Also shown are noise floor measurements for all 6 laser diodes.    

First Frequency-Domain Measurements

in Lab Updates

Raeef helped to take out first few successful frequency-domain measurements through a tissue-simulating phantom on Dec 21, 2012.  Below is a plot showing an overlay of 60 repeated measurements over an hour (a drift test) using an 808nm laser diode and APD receiver.  There are some noise issues, but a great start!