Gas analyzer
US3932754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1974 |
| Grant date | Jan 13, 1976 |
| Priority date | — |
| Expiry date | Mar 27, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3504
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A multiple gas analyzer is disclosed utilizing the infrared absorption principle for determining the quantity of two or more gases with a sample tube and a reference tube in parallel orientation with an infrared source between one end of the two tubes, and an infrared detector assembly between the other end of the tubes. Immediately opposed to each end of the tubes are a pair of mirrors, one being a transmitting mirror remote from the infrared source and directing the infrared beam in parallel paths through the reference tube and sample tube, and a receiving mirror opposite the infrared detector assembly to focus the infrared beam after passing through the tubes on to the infrared detectors. A chopper disc is interposed between the infrared source and the transmitting mirror to provide intermittently direct pulses to the infrared beam through the reference tube and sample tube to the infrared detectors, and a circuit is provided to compare the differential of signal strength from the two signals generated by each of the detectors and to calibrate the same with regard to the gas content being read. Filters are provided in the infrared detector assembly for that particular wave lengt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.