Abstract: To measure property-specific distributions like surface area and mass concentrations, in a particle field that attenuates light passing therethrough, such as a spray or aerosol, a probe beam having a suitably selected wavelength is directed into and thereby caused to interact with the particle field. Light produced by this interaction is detected by sensors separated a distance from the beam. Extinction of the probe as it propagates through the particle field is quantified by determining the amount of light exiting the field in comparison with the amount of light entering the field. The property specific concentrations are determined from the light detected by the sensors after correcting for the extinction of the beam as well as attenuation of the light traveling the distance from the beam to the sensors. The light produced by the interaction of the probe with the particle field may include scattering, fluorescence, or both.

Abstract: To measure property-specific distributions like surface area and mass concentrations, in a particle field that attenuates light passing therethrough, such as a spray or aerosol, a probe beam having a suitably selected wavelength is directed into and thereby caused to interact with the particle field. Light produced by this interaction is detected by sensors separated a distance from the beam. Extinction of the probe as it propagates through the particle field is quantified by determining the amount of light exiting the field in comparison with the amount of light entering the field. The property specific concentrations are determined from the light detected by the sensors after correcting for the extinction of the beam as well as attenuation of the light traveling the distance from the beam to the sensors. The light produced by the interaction of the probe with the particle field may include scattering, fluorescence, or both.

Abstract: A duplex voice communication link including controls therefor as provided between a Base Station connected directly to a telephone line of a telephone exchange and a Mobile Unit consisting of a small, compact cordless telephone instrument containing transmitter, receiver and control circuits powered by a rechargeable battery pack. A single logic tone is transmitted and detected for all logical control for ring signals, on-hook and off-hook signals and dial pulses.