High-accuracy ultrasonic temperature measurement based on MLS-modulated continuous wave |
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| Affiliation: | 1. College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China;2. Department of Missile Engineering, Ordnance Engineering College, Shijiazhuang 050003, China;1. Department of Chemistry, Masjed-Soleiman Branch, Islamic Azad University (I.A.U), Masjed-Soleiman, Iran;2. Department of Chemistry, Razi University, Kermanshah, Iran;3. Department of Chemistry, Shiraz University, Shiraz, Iran;1. School of Civil Engineering & Mechanics, Huazhong University of Science and Technology, Wuhan, Hubei, PR China;2. Department of Civil & Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;1. Institute of Innovative Technologies EMAG, Katowice, Poland;2. Silesian University of Technology, Gliwice, Poland |
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| Abstract: | Ultrasonic temperature measurement has the potential to improve measurement accuracy by increasing the length of a received signal due to its excellent performance with noise resistance. However, when the distance between the transmitter and receiver is limited, the received signal can be polluted by strong multiple echoes, which can significantly degrade temperature accuracy. This paper proposes a method for high-resolution ultrasonic temperature measurement. With the use of a maximum length sequence (MLS)-modulated continuous wave, the obstructive effect of echoes is effectively suppressed. A hybrid method is employed for accurate time-of-flight (TOF) estimation by incorporating both cross-correlation and phase shift (PS), which is the basis of highly accurate temperature measurement. The experimental results in distilled water show that the proposed method estimates TOF with a standard deviation of less than 0.3 ns, and temperature errors consistently remain within ±0.04 °C. |
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| Keywords: | Ultrasonic temperature measurement Maximum length sequence (MLS) Time-of-flight (TOF) Cross-correlation Phase shift (PS) |
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