Bridger Photonics
Bridger Photonics - Continuous-Wave Laser Absorption LiDAR System
A continuous-wave laser can be changed or modulated to achieve the same effect as differential absorption. This laser absorption spectroscopy technique is known in various forms as wavelength modulation spectroscopy (WMS), frequency modulation spectroscopy (FMS), or tunable diode laser spectroscopy (TDLAS). Bridger mounts the LiDAR systems on aircraft, so the ground serves as a scattering point of laser light back to the LiDAR system.
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- Transmit a continuous-wave laser through the gas to the ground with a laser frequency that is known to be absorbed by the gas.
- Modulate the laser’s frequency in time.
- Determine the concentration of the gas in the beam path by measuring the amount of modulated laser light returning from the ground.
- Scan the laser beam to determine gas concentration for all areas and to create gas plume imagery.
- Can enable compact, monolithic, and inexpensive laser sources that can be flown on light aircraft or drones.
- Can enable fiber delivery for combining with other measurement (e.g. topographical LiDAR) lasers.
- Does not require high peak power pulsed lasers for safer operation.