Fig. 1. Structure diagram of laser heterodyne spectrometer

Fig. 2. Laser heterodyne spectrum measurement and data processing flow

Fig. 3. Jacobian value of ozone in 3.3 μm

Fig. 4. Gas concentration inversion process of optimal estimation algorithm

Fig. 5. Schematic diagram of line shape function measurement of laser heterodyne spectrometer

Fig. 6. Measured results of instrument line shape function

Fig. 7. 3.3 μm ozone absorption feature measurement and inversion fitting results

Fig. 8. Prior profiles and inversion results of ozone concentration

Fig. 9. Ozone column concentration in Golmud