Environmental substance identificaton using tuned lidar modulation

A non-transitory computer readable medium comprising instructions which, when implemented in a substance identification system, cause the system execute operations comprising:

• emitting modulated radiation towards a target area,
• wherein the radiation is modulated using respective modulation codes for a predetermined number n of wavelength bands, n being an integer greater than 1;
• and
• analyzing a spectrum of detected modulated radiation from the target area to identify a substance in the target area,
• wherein the spectrum is analyzed using a time correlation of the emitted modulated radiation and the detected modulated radiation.

A system configured to implement a method of identifying substances, the method comprising:

• emitting modulated radiation towards a target area,
• wherein the radiation is modulated using respective modulation codes for a predetermined number n of wavelength bands, n being an integer greater that 1;
• and
• analyzing a spectrum of detected modulated radiation from the target area to identify a substance in the target area,
• wherein the spectrum is analyzed using a time correlation of the emitted modulated radiation and the detected modulated radiation.