Fig. 1. Diagram of optical path of dual-wavelength FWMI

Fig. 2. Variations in SDR and T_m of FWMI with FOPD. (a) 532 nm; (b) 355 nm

Fig. 3. OPD changes with incident angle

Fig. 4. SDR changes with divergence angle of incident beam

Fig. 5. SDR changes with tilted angle error

Fig. 6. SDR changes with frequency locking error

Fig. 7. Evaluation of tolerance of length of arm. (a) Relationship between SDR and length error of C7980; (b) relationship between SDR and length error of F2; (c) relationship between SDR and error of air gap

Fig. 8. SDR changes with cumulative wavefront error

Fig. 9. Profile models of optical characteristic parameters of aerosol

Fig. 10. MC simulation results of optical characteristic profiles of aerosols. (a) Simulation results of backscattering coefficient β_a at 532 nm; (b) simulation results of extinction coefficient α_a at 532 nm: (c) simulation results of backscattering coefficient β_a at 355 nm; (d) simulation results of extinction coefficient α_a at 355 nm

Fig. 11. Inversion errors of optical characteristic parameters. (a) backscatter coefficient β_a and extinction coefficient α_a at 532 nm; (b) backscatter coefficient β_a and extinction coefficient α_a at 355 nm