Method and system for high volume sample rate holographic particle measurement

Abstract

Methods and systems for measuring particles within a flow are provided. An aircraft transports a high volume sample rate holographic measurement instrument through a particle-containing volume of interest along a reference axis X (time). As the instrument moves relative to the volume of interest, the holographic measurement instrument transmits a collimated light beam across the volume of interest along an optical axis Z. The light beam interacts with particles contained within the volume of interest, and a high-speed, one-dimensional detector array detects incident light reflecting patterns of light intensity levels that are associated with the interaction between the light beam and the particles. A processor integrates information relating to the detected patterns and a rate of relative movement between the measurement probe and the volume of interest to determine at least a statistically meaningful sampling of time-dependent particle distribution information associated with an entirety of the volume of interest. Using the time-dependent particle distribution information and automatic reconstruction algorithms running on the processor, the processor reconstructs holograms that depict the particles within the volume of interest. These holograms are then used to measure a spatial distribution, size distribution, number density or concentration, and/or shape of the particles within the volume of interest.

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