Fig. 9-1 (center)

Schematic diagram of the remote particle counter By emitting a laser pulse in the air and then using a CCD camera to detect the backscattered light rays from airborne particles in the limited measurement volume of the laser propagation area, this system can produce the picture image shown in Fig. 9-2.

Fig. 9-2 (left)

Photographic image of backscattered light rays from particles suspended in air Even particles in the air 500 m from the observation station can be detected.

Fig. 9-3 (right)

A histogram of the peak intensity of backscattered light rays The number and optical peak intensity of white spots in Fig. 9-2 can be obtained by image data processing on a personal computer.

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