The invention discloses a three-band integrated atmospheric
aerosol particle scattering coefficient
measuring instrument and a three-band integrated atmospheric
aerosol particle scattering coefficient measuring method. The
measuring instrument comprises an optical measurement chamber, a light-emitting-
diode (LED)-based
integrating sphere light source (7) is arranged at the top of the chamber, a plurality of diaphragms (19, 20, 21, 22, 23 and 24) are arranged in the chamber, and a reflector (9) is arranged at a non-detection end to prevent multiple times of
scattered light from entering a
detector (11); and a sample gas inlet port (17) and a gas outlet port (18) are formed in the chamber, and the sample gas is extracted through a sampling pump (13) and enters a scattering cavity (8) from the gas inlet port. When the
integrating sphere light source (7) is lightened, the light emitted from the
light source is irradiated on the sample gas, and the actual measured
scattered light intensityis received through a single
photon detector (11) and converted into the measured
photon number; a
frosted glass (28) with stable performance is used for generating
scattered light to eliminate errors caused by
light intensity fluctuation of a light source and
magnification drift of a photoelectric multiplier tube; through the standard gas and the zero gas, the measured
scattering coefficient is calibrated and the air
Rayleigh scattering background is deducted; and the single
photon detector converts the received scattered light signals into electrical signals, then the electrical signals areprocessed and controlled by a micro
processing control circuit, the
scattering coefficient is measured in real time, and the data are transmitted to a touch screen (16) and displayed. The
measuring instrument has good instantaneity, high
measurement precision and
stable system, and is easy for maintenance.