Circuit arrangement for determining the characteristics of liquids and/or gases, in particular the hemoglobin content of the blood
US4417812A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1981 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Mar 3, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/1626
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit arrangement for determining the characteristics of liquids and/or gases, in particular for determining the diverse parameters of blood. The equipment determines the ratio of the signals of the sensing element resp. of the signal converter at a double-light photometer and a reference, simultaneously performing constant or periodical testing, accordingly, the control of the whole measuring system can be ensured. Signal processing takes place by the expansion of series or cutoff point interpolating logarithm forming, by averaging; the system includes structural elements for performing adjustable error detection. The largest advantage of the circuit arrangement according to the invention lies in that the instabilities of the photometers of traditional construction may be eliminated, a higher measuring accuracy becomes possible, and by ensuring the testing possibilities, by performing a continuous self-control reliable measuring data are delivered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.