Systems and methods for identifying and controlling interfaces b

Details Systems and methods for identifying and controlling interfaces b Systems and methods for identifying and controlling interfaces b

1995-06-07

1996-10-15

Gonzalez, Frank

Optics: measuring and testing

Blood analysis

250573, 250577, 73 6169, G01N 3348

Patent

active

055659772

ABSTRACT:
Systems and methods locate at least three spaced apart sensing units in association with volume of blood comprising a first blood component region, a second blood component region, and an interface region between the first and second blood component regions. The systems and methods locate at least one of the sensing units so that its optical field lies above the interface region and at least one of the sensing units so that its optical field lies below the interface region. Each sensing unit senses the attenuation of energy emitted into blood in its optical field and generates a signal relating to the attenuation. The systems and methods convert the signals to a signal vector of signal values having a shape approximated by a function. The systems and methods normalize the signal vector, and also create a vector of convolution signal values by multiplying the normalized signal vector by the function. The systems and methods identify the sensing unit associated with the highest convolution signal value. It is this sensing unit that lies closest to the interface. The systems and methods can limit the signal values of the signal vector according to prescribed criteria that eliminate the effect of noise.

REFERENCES:
patent: 4194391 (1980-03-01), Rosenberger
patent: 4450722 (1984-05-01), Keyes, IV et al.
patent: 5463228 (1995-10-01), Krause

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