| 摘要 |
The present invention is a device to measure the characteristics of droplets within a stream of liquid droplets used in spraying. It comprises: a light source (45) supplying light across the stream of droplets; detection (means 2) to detect change in the light level caused by a passing droplet, the detection means generating a signal according to the change in light; and processing means (59) to analyse the characteristics of the droplets in the stream based on the signal produced by the detection means. The light passes through a slit (3A) in a panel (53) disposed between the droplet stream and the detection means (52), so that the change in level of light detected by the detection means is proportional to the diameter of the droplet. Preferably two or more intersecting light beams (68,69) are used to provide comparative data about passing droplets.
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