Schwebstoffe im Schallfeld

Brandt, Olof; Freund, Hermann; Hiedemann, E. A.

doi:10.1007/bf01330066

Cited by 39 publications

(5 citation statements)

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“…Gucker and Doyle constructed an apparatus with which they could measure the amplitude ratio X p / X g , where Xp is the amplitude of oscillation of the particle and X, is that of the unperturbed sound wave. Sewell (1910) obtained an equation relating the amplitude and phase of the particle to that of the unperturbed sound wave, which approximates to the following result obtained by Brandt et al (1937) for rapid variation of X p / X g and small particle radii (a < 5 pm for the conditions of Gucker and Doyle): in which i = R , pp is the particle density, w is the angular frequency of the sound wave, and p is the gas viscosity. Particle amplitudes were measured photographically, and particle radii were determined from the rate of fall of the aerosol particles in the absence of the acoustic field.…”

Section: Acoustic Levitationmentioning

confidence: 54%

A History of Single Aerosol Particle Levitation

Davis

1997

Aerosol Science and Technology

191

142

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Section: Acoustic Levitationmentioning

confidence: 54%

A History of Single Aerosol Particle Levitation

Davis

1997

Aerosol Science and Technology

191

142

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“…It is very useful to have the approximate solution of the BBO equation as given by Brandt, Freund, and Hiedemann (BFH) (Brandt et al, 1937). It is very useful to have the approximate solution of the BBO equation as given by Brandt, Freund, and Hiedemann (BFH) (Brandt et al, 1937).…”

Section: Motion Of Aerosol Particles In An Acoustic Field: Vibrationmentioning

confidence: 99%

Ultrasonic agglomeration and preconditioning of aerosol particles for environmental and other applications

et al. 2015

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“…If the seeding particles are sufficiently small to follow the fluid motion, the particle velocity is equal to the fluid velocity [19][20][21].…”

Section: Laser Doppler Anemometrymentioning

confidence: 99%

Calibration of a micromachined particle velocity microphone in a standing wave tube using a LDA photon-correlation technique

Raangs

Schlicke

Barham

2005

Meas. Sci. Technol.

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In this paper, a new method of calibrating an acoustic particle velocity sensor using laser Doppler anemometry (LDA) is discussed. The results were compared and were in good agreement with the results obtained by conventional methods, where the sensitivity of the microflown is obtained with the use of a reference microphone and a standing wave tube. The LDA signal generated by the acoustic particle motion was analysed using the photon-correlation method, where the signal is considered to consist of a series of discrete photon events. The photon-correlation system is used to measure particle velocity amplitude next to the microflown particle velocity sensor in a standing wave. Measurements are performed for frequencies between 250 Hz and 4 kHz and velocities between 5 mm s−1 and 25 mm s−1 (root-mean-square (rms) values) which are equivalent to sound fields of 100 and 114 dB SPL in free field. From the output voltage of the probe microflown and the LDA-derived particle velocity in a standing wave, the sensitivity of the microflown is obtained. The two different calibration methods are in good agreement showing a discrepancy of 1 dB for the frequency range of 250 Hz–4 kHz.

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Schwebstoffe im Schallfeld

Cited by 39 publications

References 0 publications

A History of Single Aerosol Particle Levitation

A History of Single Aerosol Particle Levitation

Ultrasonic agglomeration and preconditioning of aerosol particles for environmental and other applications

Calibration of a micromachined particle velocity microphone in a standing wave tube using a LDA photon-correlation technique

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