Shadow Doppler Particle Analyzer ( SDPA )
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Principle
The SDPA optics consists of a conventional laser Doppler velocimeter (LDV) and a shadow receiver. The velocity of a particle passing through the measuring volume is obtained by the LDV. On the other hand, the shadow image of the particle is focused on an objective lens and then magnified onto a fiber-array linear image sensor (typically 64 channels). Each channel of the sensor is connected to an avalanche photo diode (ADP).
The sensor captures a sliced image of the particle shadow with two laser beams at each data-sampling moment. The image is digitized by 8-bit analog-digital converters for data storage. Combined with the velocity information, the particle shape is reconstructed from collection of the sliced images.
Exhibit A: Doppler & Shadow Measurement
Exhibit B: Particle Shape Measurement (for Arbitrary Shaped Particles)
For more detailed explanation about the principle of SDPA, please click on these links.
1. "Shadow Doppler Particle Analyzer" (Technical Report)
Click these links for more details.
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