Calibration method for gas or vapor relative concentration sensor
Abstract
Abstract This invention concerns a calibration method and compatible sensor construction for the determination of relative concentration of a gas or vapor. According to the method a sensor is brought to controlled conditions, in which at least one calibration point is determined, and then with the help of the calibration point measurement values the response of the sensor for the measured gas or vapor is computed. According to the invention, both the temperature of the sensor and the relative concentration of the desired gas or vapor is measured at the actual measurement site, and the temperature of the sensor is deviated from the ambient temperature so transiently that the partial pressure of the measured gas or vapor can be assumed to stay at least approximately constant at the measurement site, whereby the results of measurements performed at each deviated temperature level can be used for computing a correction factor for the calibration of the sensor. An improved measurement accuracy results from the uncomplicated calibration routine.
Inventors
- 👤 Pekka Belt
- 👤 Lars Stormbom
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |