Suspended particulate matter mass concentration real-time detection device, and measuring method

The invention discloses a suspended particulate matter mass concentration real-time detection device. The suspended particulate matter mass concentration real-time detection device comprises a photoelectric sensor, a voltage amplitude discriminator, an FPGA multi-channel acquisition module, a microprocessor module, a liquid crystal display module, a humidity sensor module, and a power module; signals collected by the photoelectric sensor are transformed into voltage signals via a signal adjusting circuit, and the voltage signals are send to the voltage amplitude discriminator; the voltage amplitude discriminator is connected with the FPGA multi-channel acquisition module and the microprocessor module successively; the microprocessor module is connected with the liquid crystal display module and the humidity sensor module respectively. According to a measuring method using the suspended particulate matter mass concentration real-time detection device, after establishment of a BP neural network via particle swarm optimization, obtained weight values, threshold values, and a mass concentration calculation formula obtained via relative humidity correction are send to the microprocessor module; and the microprocessor module is used for humidity algorithm compensation of received measuring results based on the mass concentration calculation formula; so that influences of environment change on measuring results are avoided, and measuring data is optimized.