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- W1982196356 abstract "When using time-of-flight aerosol spectrometers, particle size measurement is based upon a particle's transit time between two laser beams. The particle's transit time is assumed to be the time difference between the two pulses of light that are produced as the particle passes through the two laser beams. Particle coincidence, which occurs when a second particle crosses the first laser beam before the first particle crosses the second laser beam, has a complex effect upon the measured size distribution. As a result of coincidence, time-of-flight aerosol spectrometers can replace real particles of one size with spurious, or phantom, particles of a different size in the measured distribution. When partial detection of a particle occurs, i.e., only one pulse from a particle is detected, another particle producing a pulse that occurs while the timer is open can cause the recording of a randomly sized phantom particle. The creation of these phantom particles, which we termed “open-timer” phantom particles, has been investigated theoretically and experimentally in a commercially available time-of-flight aerosol spectrometer. The number of these open-timer phantom particles was found to increase with particle size and aerosol concentration. In addition, the instrument's detection logic affects the number and size of the phantom particles. These are most apparent in the tails and minima of the measured distribution. In order to minimize phantom particle creation, the concentration of partially detected particles must be minimized. Strategies to reduce phantom particle concentration involve reducing the concentration of small particles near the optical detection threshold of the spectrometer." @default.
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- W1982196356 date "1991-01-01" @default.
- W1982196356 modified "2023-09-24" @default.
- W1982196356 title "Coincidence in Time-of-Flight Aerosol Spectrometers: Phantom Particle Creation" @default.
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- W1982196356 doi "https://doi.org/10.1080/02786829108959476" @default.
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