Laser Doppler flow measurements with a semiconductor laser.

In their report on laser Doppler flow measurements (J. Biomed. Eng. 1985, 7, 225) Boggett et al. compared, among other things, three different light sources for use in a laser Doppler device. The aim of that study was to distinguish between Doppler shifted and non-shifted backscattered light to obtain a flow dependent signal, which is not caused by intensity fluctuations due to number fluctuations, laser amplitude instabilities or other unwanted causes. We wish to comment on that paper.