Calibration in a blood analyzer

Details Calibration in a blood analyzer Calibration in a blood analyzer

1975-12-08

1977-12-06

Serwin, R.E.

Chemistry: physical processes

Physical processes

Crystallization

356 39, 364416, G01N 3316, G01N 2124

Patent

active

040614697

ABSTRACT:
In a blood analyzer, improved calibration is provided. First and second photodetectors sense energy supplied directly from a source and from the source through a sample respectively. A log ratio amplifier provides an analog output indicative to the log of the ratio of the outputs of the photodetectors to a control circuit. When a blank sample is measured, a programmable voltage source operates to set the analog output to a selected level. A reference sample having optical density corresponding to a preset value is next measured, and a variable gain amplifier is set by the control circuit to cause the analog signal to correspond to the preset value.

REFERENCES:
patent: 3697224 (1972-10-01), Means
patent: 3725204 (1973-04-01), Marshall, Jr. et al.
patent: 3861877 (1975-01-01), Matharani et al.
patent: 3873273 (1975-03-01), Moran et al.
patent: 3874850 (1975-04-01), Sorensen et al.

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