System and method and apparatus for a continuous aerosol monitor

Details System and method and apparatus for a continuous aerosol monitor System and method and apparatus for a continuous aerosol monitor

1982-09-30

1984-09-25

Willis, Davis L.

Optics: measuring and testing

For size of particles

By particle light scattering

356338, G01N 1502

Patent

active

044732961

ABSTRACT:
A method and apparatus is disclosed for measuring the mass concentration of particulates entrained in a process or work area. One or more sensors are employed which electro-optically and continuously weigh the effluent extracted from the process area. The effluent is caused to enter a sample volume area either by convection or through a preseparator. The sampling volume is exposed to near infrared radiation of a light emitting diode (LED). An information signal indicative of small and large particulates entrained in the effluent is developed. The signal is converted and classified to signals corresponding to the presence of small or large particulates and further sub-classified as to size. The electro-optical "weighing" signals are operated on to produce a mass concentration read-out via an empirical algorithm exercised by a microprocessor in a centrally-located control/read-out unit which serves a multiple of remote sensors. The microprocessor also permits convenient automatic compensation of each sensor's electro-optical transfer function, i.e., baseline zero and span. Traceable calibration is also provided.

REFERENCES:
patent: 3398286 (1968-08-01), Ford et al.
patent: 3430220 (1969-02-01), Deuth
patent: 3563661 (1971-02-01), Charlson et al.
patent: 3713743 (1973-01-01), Simms
patent: 3797937 (1974-03-01), Shofner
patent: 3810697 (1974-05-01), Steinberg
patent: 3869208 (1975-03-01), Lorenz
patent: 3873206 (1975-03-01), Wilcock

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