Spectral analysis of laser Doppler signals in real time using digital processing

✍ Scribed by G. Dougherty

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 484 KB
• Volume: 16
• Category: Article
• ISSN: 1350-4533
• DOI: 10.1016/1350-4533(94)90008-6

✦ Synopsis

A versatile spctrum analyser was devebed to generate and display lhrGT Doppler s&j2 signals, and akivedparameters, continuously in reul time using a digital signal processing chip. A major attraction of the ystem is that it is entirely programmable, so that both the a&n+ithms and the attribute of the system, such as witllIowficm.-tion andfiame overlap, can be easib a&red. It was used to investigate the relative mmrits of a variety of algorithms using a blood-pow phantom.

An index based on &first moment of the Dopplerpo wer spectrum warfiund to be the-most relkablcjlav indicator, with linearity extending towards a velocity of 5 mm s-' for a blwd huematocrit of 5%. The system is not limited to analysis baud on the fat Fourier transjkm (FFlJ, and is

suitable for non-linear techniques such as maximum entrcrp~ spectral estimation (UESI$).