IN-SITU MEASUREMENT OF PARTICLE SIZES Sandia National Laboratories has developed and patented (U.S. Patent No. 4,441,816), a method for in-situ measurement of particle sizes. The size information is obtained by scanning an image of the particle across a double-slit mask and observing the transmitted light. This method is useful when the particle size of primary interest is 3 mu m and larger (e.g.) in situ measurements in fossil fuel combustion systems. The technique is well suited to applications in which the particles are non-spherical and have unknown refractive index. It is particularly well suited to high temperature environments in which the particle incandescence provides the light source. The system is very simple and low cost; the signal from each particle is very simple, thus minimizing the complexity of the signal processing; the measurement volume is small, so that high particle densities can be accommodated; the size information is obtained from a single detector, so that the high optical sensitivity of photomultiplier tubes can be realized; knowledge of refractive index is not required thus making the system simpler; and particle velocity as well as can be measured. This is not a solicitation. Parties interested in licensing this invention are invited to submit a letter of interest providing information about the company, area of potential application for the technology, and a point of contact. Letters should be sent to Joanne Trujillo, MS 1380, Sandia National Laboratories, P.O. Box 5800 Albuquerque, NM 87185-1380. (FAX) 505-271-4202.

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