Abstract
The temperature dependent of the ratio between second and first harmonic signals in wavelength modulation spectroscopy was experimentally measured. The results show the ratio decrease with the temperature increase, the temperature increase from 30°C to 50°C, the ratio decrease about 5%, the results is consistent with theoretical calculation. As increasing the temperature of the CO gas, the ratio between second and first harmonic signals is the straight line parallel displaces downwards. Therefore, the measuring concentration can be corrected by using a calibrated temperature curve in practice sensor application. The results are useful for the application of the diode laser sensor of the ratio detection type.
| Original language | English |
|---|---|
| Article number | 90 |
| Pages (from-to) | 747-754 |
| Number of pages | 8 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 5832 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2005 |
| Externally published | Yes |
| Event | Optical Technologies for Atmospheric, Ocean and Environmental Studies - Beijing, China Duration: 18 Oct 2004 → 22 Oct 2004 |
Keywords
- Diode laser
- Harmonic detection
- Wavelength modulation