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TIDA-00378: pcs/cm3 to ug/m3

Ray Vincent Aranzaso
Genius 16105 points
Part Number: TIDA-00378

Hi,

Good Day.

www.ti.com/.../tidub65c.pdf

In this document, it is stated that the range of this PM2.5/PM10 particle sensor is 12 to 35 pcs/cm3. How is this converted to ug/m3? Because other products on the market use the unit of ug/m3.

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Guru 62920 points

    Hi Ray,

    This design computes particle number concentrations by counting the pulses received at the photodetector and measuring their amplitudes.  More frequent pulses correspond to higher concentrations of a given particle size, and higher amplitudes generally correspond to larger particles since they would have more surface area to reflect light back to the detector.  (The reflectivity of the particle would influence things as well.) 

    If you were able to estimate the density of particles (in ug/m3), you could also consider the pulse amplitude to correspond to particle mass since larger reflected amplitudes would mean larger particle diameters which would mean more mass per particle.  The mass would be the product of the density and volume, which for spherical particles would be (diameter)^3 * pi/6.

    Please let me know if this isn't clear or if you have further questions.

    Regards,
    Max