To measure the concentration of trace CO 2 with high performance, tunable diode laser absorption spectroscopy technology was adopted in this paper.Kalman-wavelet algorithm was used to depress the detector noise and optical interference fringe noise. Experimental results show that the second harmonic signal-to-noise ratio of the measuring system at 50ppmv CO 2 gas was improved by 2.06 times compared with no filtering. Under different CO 2 concentrations, the measuring errors are from 2.57% to 2.66%. According to Allan variance analysis, the minimum detection limit was reduced to 5.2 ppmv with the optimal integration time of 61 s. And, the standard deviation value was decreased from 33 to 19 ppmv during long-term measurement, which can guarantee the high-performance measurement of CO 2 gas.

This paper proposes a real-time semantics-driven infrared and visible image fusion framework (RSDFusion). A novel semantics-driven image fusion strategy is introduced in image fusion to maximize the retention of significant information of the source image in the fusion image. First, a semantically segmented image of the source image is obtained using a pre-trained semantic segmentation model. Second, masks of significant targets are obtained from the semantically segmented image, and these masks are used to separate the targets in the source and fusion images. Finally, the local semantic loss of the separation target is designed and combined with the overall structural similarity loss of the image to instruct the network to extract appropriate features to reconstruct the fusion image. Experimental results show that the RSDFusion proposed in this paper outperformed other comparative methods on both subjective and objective evaluation of public datasets and that the main target of the source image is better preserved in the fusion image.