PM2.5 concentration monitoring device based on CCD back scattering

The utility model relates to a PM2.5 concentration monitoring device based on (charge coupled device) CCD back scattering. The concentration monitoring device comprises a light emission unit and a light detection unit, wherein the light emission unit is composed of a quasi-continuous laser 532nm in wavelength; the light detection unit is composed of a telescope objective, a CCD and a computer, wherein the CCD is located on a focal plane of the telescope objective; a signal output end of the CCD is connected to the computer; the beam propagation direction of the laser is parallel with the optical axis of a telescope for receiving scattered light; and a back scattering signal is received through the low-illumination CCD. The concentration monitoring device disclosed by the utility model has the characteristics of good mobility and operability, relatively low cost and simple structure. By regulating a balancing pole and a balancing hammer on a tripod, PM2.5 concentration in a required region can be conveniently measured.