optical imaging probe
Of these, shadowing probes differentiate particle shadows from the light
of the unobstructed beam
arrays of optically activated diodes; for example, the one-dimensional cloud probe
normally for sizing 10-μm to either 300- or 600-μm cloud hydrometeors, the two-dimensional cloud probe
normally for sizing and imaging 25–800-μm cloud
hydrometeors, and the two-dimensional precipitation probe
normally for sizing and imaging 200-μm to 6.4-mm precipitation
hydrometeors. The electronics record either the maximum one-dimensional width of the shadow or two dimensions and shape of the shadow, to estimate particle size and type (raindrop
growth habit, etc.). Another type, the cloud particle imager
, illuminates each particle with a pulsed laser and records size, shape, and detailed structure of each hydrometeor
with a high-resolution solid-state digital imaging camera, normally to size 5-μm–2.3-mm hydrometeors.
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