Particle detecting device

A particle detecting device, comprising:

• an impactor comprising a box and an impacting plate, wherein the box comprises a screening chamber, an air inlet and a discharging through hole, the screening chamber is disposed within the box and in fluid communication with the air inlet and the discharging through hole, and the impacting plate is disposed within the screening chamber, corresponding to the air inlet, and maintains a spacing distance, wherein a gas containing a plurality of suspended particles inhaled through the air inlet is impacted for performing separation and screening based on different diameters of the suspended particles, so that screened and required-diameter particles are led out and collected through the discharging through hole;
• a resonator disposed under, sealed and connected to the impactor, and comprising a sampling chamber, a driving board, a piezoelectric vibrator and a suspended-particle sensor, wherein the sampling chamber is in fluid communication with the discharging through hole of the impactor, the driving board is disposed within the sampling chamber and comprises at least one passage hole disposed thereon, and the piezoelectric vibrator is packaged on the driving board, wherein the suspended-particle sensor is packaged on the piezoelectric vibrator, and the suspended-particle sensor is corresponding to the discharging through hole and maintains a spacing distance, wherein driving power and operation frequency of the piezoelectric vibrator are provided by the driving board, and a resonance frequency of the piezoelectric vibrator is changed, thereby the screened and required-diameter particles are sedimented and collected on a surface of the suspended-particle sensor, so that a mass and a concentration of the screened and required-diameter particles are detected;
• and
• a piezoelectric actuator disposed under, sealed and connected to the resonator, and driven to enable gas transportation, so that the gas is inhaled through the air inlet from an outside of the particle detecting device, flows into the resonator to be collected by the suspended-particle sensor, and discharged out of the particle detecting device through the at least one passage hole.