Fig. 1. Working principle diagram inside the instrument

Fig. 2. Composition of the experimental equipment

Fig. 3. Physical diagram of the experimental equipment

Fig. 4. Schematic diagram of the front and rear panels of the chassis. (a) Front panel; (b) rear panel

Fig. 5. Structure of the automatic opening and closing leaf chamber. (a) Overall structure; (b) structure of the drive assembly

Fig. 6. Structure of the hand-held leaf chamber. (a) Overall structure; (b) enlarged view of guide assembly; (c) enlarged view of drive assembly

Fig. 7. Circuit block diagram of the access node

Fig. 8. Workflow of the access node

Fig. 9. Activity diagram of compute nodes

Fig. 10. Human-computer interaction interface

Fig. 11. Remote monitoring interface

Fig. 12. Monitoring experiments. (a) Strawberry plants; (b) geranium plants

Fig. 13. Linear regression graph of photosynthetic rate of different plants. (a) Strawberry plant; (b) geranium plants

Fig. 14. Multi-line graph of photosynthetic rate of different plants. (a) Strawberry plant; (b) geranium plant

Fig. 15. Response time and stability test curve of the system

Fig. 16. Stability test curve of the system under different CO₂ concentrations. (a) 300 mol/L; (b) 500 mol/L; (c) 700 mol/L