Ultrasonic Temperature Measurement in Internal Combustion Engine Chamber

Livengood, J. C.; Rona, Thomas P.; Baruch, Jordan J.

doi:10.1121/1.1907425

Cited by 21 publications

(1 citation statement)

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“…The windows used in such methods might be contaminated and accuracy can also be degraded. Therefore, acoustic pyrometry [2] has been developed and commercialized as an alternative non-intrusive pyrometry, by using the CT method [3,4].…”

Section: Introductionmentioning

confidence: 99%

Acoustic computer tomographic pyrometry for two-dimensional measurement of gases taking into account the effect of refraction of sound wave paths

Lü

Wakai

Takahashi

et al. 2000

Meas. Sci. Technol.

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The algorithm which takes into account the effect of refraction of sound wave paths for acoustic computer tomography (CT) is developed. Incorporating the algorithm of refraction into ordinary CT algorithms which are based on Fourier transformation is very difficult. In this paper, the least-squares method, which is capable of considering the refraction effect, is employed to reconstruct the two-dimensional temperature distribution. The refraction effect is solved by writing a set of differential equations which is derived from Fermat's theorem and the calculus of variations. It is impossible to carry out refraction analysis and the reconstruction of temperature distribution simultaneously, so the problem is solved using the iteration method. The measurement field is assumed to take the shape of a circle and 16 speakers, also serving as the receivers, are set around it isometrically. The algorithm is checked through computer simulation with various kinds of temperature distributions. It is shown that the present method which takes into account the algorithm of the refraction effect can reconstruct temperature distributions with much greater accuracy than can methods which do not include the refraction effect.

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Section: Introductionmentioning

confidence: 99%

Acoustic computer tomographic pyrometry for two-dimensional measurement of gases taking into account the effect of refraction of sound wave paths

Lü

Wakai

Takahashi

et al. 2000

Meas. Sci. Technol.

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Schallimpulse im Niederdruckplasma

Hayess¹

1966

Contrib Plasma Phys

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Zur Schallerzeugung in der Siederdruckentladung kenn e k e lokale Impuk-Bihentladung angewendet werden. In der vorliegenden Arbeit wird anhand experimentellcr Cntersuchungen gezeigt, daB dabei die Schallerzeugung durch eino lokale Aufheizung dea Neutralgases im Bereich der Anregungselektrode zustande kommt. Es entstehen einsinnig gerichteta Schallimpulse. &?i der Ausbreitung durch die Entladungssaule regen dime Schallimpulse die elektrisch aktiven Plasmakomponenten zu zeitlich stark gedampften Schwingungen an, die sich anf photoelektrischem Wege nachweisen lassen. Die Ausbreitungsgeschwindigkeit und die riiumliche Dampfung der optisch zu beobachtenden Wellcnzilge Bind fiir die Schallausbreitung selhst charekteristisch.

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