Apparatus for measuring components of liquid samples
US4236075A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1978 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | Aug 7, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring components of liquid samples, such as milk samples, based on the ability of these components to absorb infrared radiation at certain frequencies. A single radiation beam is directed through a cuvette containing the sample, and the apparatus comprises a plurality of pairs of optical filters. Each of these pairs is associated with a respective one of the components to be measured and comprises a component filter for passing infrared radiation at a narrow frequency band at which the radiation absorbing ability of the said component is relatively high, and a reference filter for passing infrared radiation at a different narrow frequency band at which the radiation absorbing ability of the component is lower. A component of the sample is measured by successively positioning the filters of the associated pair of filters in the radiation beam between the radiation source and the cuvette, and the radiation passing the cuvette is detected by a detector, preferably a thermopile radiation detector of the monolithic type, and the content of the respective component is calculated on the basis of the signals received from the detector. The radiation beam is chopped by …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.