Computer sound card assisted measurements of the acoustic Doppler effect for accelerated and unaccelerated sound sources

Bensky, Thomas J.; Frey, Sid

doi:10.1119/1.1405503

Cited by 22 publications

(18 citation statements)

References 4 publications

(4 reference statements)

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“…(7) and (2) one can integrate both sides to obtain ϕ in Eq. (6). Finally, substituting the expressions for A and ϕ, the model for the signal received by the microphone is…”

Section: Theoretical Resultsmentioning

confidence: 99%

Calculating g from Acoustic Doppler Data

Torres

González-Espada

2006

The Physics Teacher

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Traditionally, the Doppler effect for sound is introduced in high school and college physics courses. Students calculate the perceived frequency for several scenarios relating a stationary or moving observer and a stationary or moving sound source. These calculations assume a constant velocity of the observer and/or source. Although seldom discussed in this context, generalization of the Doppler effect for accelerated sound sources is relatively straightforward and can be used as an enriching tool in the classroom. The purpose of this paper is to describe a simple experiment to determine the acceleration of gravity (g) from an acoustic source in free fall.

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“…(7) and (2) one can integrate both sides to obtain ϕ in Eq. (6). Finally, substituting the expressions for A and ϕ, the model for the signal received by the microphone is…”

Section: Theoretical Resultsmentioning

confidence: 99%

Calculating g from Acoustic Doppler Data

Torres

González-Espada

2006

The Physics Teacher

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“…One method would be to attach a low mass sound source to the atlatl spur and use the Doppler shift to measure velocity versus time. 12 Two sound sources with different frequencies could be attached to different places on the atlatl and enable simultaneous measurements of the velocity and angular velocity. The assumption that force and torque depend only on hand position should be verified by throwing with different masses.…”

Section: Discussionmentioning

confidence: 99%

Dynamics of spear throwing

Baugh¹

2003

American Journal of Physics

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The spear thrower ͑atlatl͒ is a hunting weapon with very ancient origins. It is a lever that enables wrist rotation to make a substantial increase in the velocity of a thrown spear. A model for throwing a projectile with an atlatl is presented. This model is used to analyze the projectile velocity as a function of the dimensions, rigidity, and mass distribution of the atlatl and mass of the projectile. The model assumes that the throwing force and wrist torque are functions only of the horizontal position of the throwing hand and that the spear is sufficiently long that the atlatl applies only a horizontal force to the proximal end of the spear. The applied force and torque were derived from a high-speed video digitizer plus the known physical dimensions of the atlatl and spear.

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“…A computer sound card has been used in measuring the speed of a moving object by direct application of the Doppler effect for sound [5], for recording thermal noise of crystal tuning forks by detecting nanomechanical interactions as an alternative to the usual microcantilever-optical levers used in atomic force microscopy (AFM) [6], and for data acquisition in resonant photo-acoustic detection [7].…”

Section: Introductionmentioning

confidence: 99%