Fig. 1. Structure diagram of the gas cell sampling system

Fig. 2. Cooperative target telemetry system based on WMS

Fig. 3. Layout of a fenced TDLAS system

Fig. 4. Handheld TDLAS system with non-cooperative targets for remote sensing

Fig. 5. Intelligent robot equipped with RMLD^[44]

Fig. 6. Realization of the leak localization^[44]

Fig. 7. UAV carrying a small methane laser sensor^[45]

Fig. 8. Structure of the ICL non-cooperative target telemetry experiment system^[46]

Fig. 9. Leak plume image^[46]

Fig. 10. A set of methane and ethane detector system deployed on the vehicle^[62]

Fig. 11. Field test results of dual-gas (methane / ethane) sensor system. (a) Methane; (b) ethane^[62]

Fig. 12. A new type of compact dense mode multi-channel gas cell^[92]

Fig. 13. A portable hydrogen sulfide detection sensor^[93]

Fig. 14. A mid-infrared hydrogen sulfide gas detection system^[97]

Fig. 15. TDLAS system for oxygen_{detection in the remaining empty layer at the top of oil tank^[114]}

Fig. 16. Structure of the detector gun in the TDLAS system^[114]

Fig. 17. A handheld remote methane leak detector^[125]

Fig. 18. RMLD deployed on UAV^[126]

Fig. 19. Device combining the robot platform “Gasbot” with RMLD^[129-130]