| CPC G01N 29/022 (2013.01) [G01N 29/4436 (2013.01); G01N 2291/02408 (2013.01)] | 20 Claims |
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1. A dust mass measurement device comprising:
a sensing channel configured to generate a sensing clock signal, the sensing channel comprising a first surface acoustic wave sensor configured to generate a surface acoustic wave and a first amplifier configured to amplify the surface acoustic wave generated by the first surface acoustic wave sensor;
a reference channel configured to generate a reference clock signal, the reference channel comprising a second surface acoustic wave sensor configured to generate a surface acoustic wave and a second amplifier configured to amplify the surface acoustic wave generated by the second surface acoustic wave sensor;
a counter electrically connected to the sensing channel and the reference channel and configured to generate a first output signal based on the sensing clock signal, and generate a second output signal based on the reference clock signal; and
a controller electrically connected to the counter and configured to:
calculate a frequency difference between the sensing clock signal and the reference clock signal based on a difference value between the first output signal and the second output signal; and
measure a mass of particulate matter based on the frequency difference between the sensing clock signal and the reference clock signal.
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