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자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 Symposium 한국자동차공학회 2001년 심포지움(PROCEEDINGS OF BUSAN ENGINE INTERNATIONAL)
발행연도
2001.12
수록면
113 - 117 (5page)

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초록· 키워드

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Measuring method of gas temperature with ultrasonic wave is to get the temperature from the sound velocity of sound wave when it goes through a substance which looks upon the ideal gas. It is because of the fact that the temperature of ideal gas is the function of only sound velocity. Formerly the measurement of gas temperature by sound wave was used to determine from the transit time that it was measured directly when the sound wave goes through a constant distance in gas. This study has been used a principle that sound velocity is estimated with the frequency when the phase difference between used a principle that sound velocity is estimated with the frequency when the phase difference between ultrasonic transmitter and ultrasonic receiver is single wavelength as well. But this method is different at the point that it is used ultrasonic wave as carrier wave and is transferred it to frequency modulation. In this study, the effect on a length between the ultrasonic transducers is considered, and being used a wind channel with heater and a blower, the variation of temperature is observed in accordance with air velocity and angle between direction of face of ultrasonic transducers and direction of gas flow.
Conclusions are as follows. Ultrasonic wave by frequency modulation method can measure the gas temperature safely because it can prevent noise from surround. and is amplified a constant frequency. Gas temperature by ultrasonic wave is little effect on the distance of sensors. air velocity, angle of between gas flow direction and face direction and face direction of sensors in this experimental range. Opposite angle of sensors is little effect on the temperature below 30° , but temperature measurement of ultrasonic wave is impossible if it is over 30° . But this problem may virtually have relevance to directivity of ultrasonic wave.

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Abstract

1.INTRODUCTION

2.PRINCIPLE OF TEMPERATURE MEASUREMENT USING ULTRASONIC WAVE

3.Experimental equipment and method

4.Conclusion and discussion

5.Conclusions

Acknowlegement

References

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