A telescope is then used to collect data on the scattered light and calculate the distance to the target. Since the light is traveling at the speed of light — 299,792,458 m/s — the device is able to calculate how long it has taken the light (photons) to travel from the time it leaves the device and the telescope receives the returning photons. Just about anything will scatter the light (photon): dust, vapors, aerosols, and, in this application, a moving object.
A customer that outfits law enforcement vehicles with electronics also tests the LIDAR guns for performance. An Ophir PD300 sensor connected to an Ophir meter regularly checks the power output of the beam to confirm it is producing the proper amount of power.
The customer wants to go one step further in the testing procedure and test each of the three diodes that produces the beam. Two different methods were tested.
The equipment for the two tests included:
Ophir-Spiricon BeamGage® Professional software Ophir-Spiricon USB SP620 profiling camera 2” Opalescent diffuser 25mm CCTV lens “C” mount ND1 filter
When simply firing the beam directly onto the SP620 profiling camera, the beam scattered across the area of the array and made it impossible to distinguish the three diodes, as seen in Figure 3.