Deviation Factor and Temperature-Compensation Factor of Simple Industrial Ultrasonic Solution-Concentration Sensor Which Automatically Eliminates Temperature Dependence

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概要

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• In this study, the author analyzed the deviation factor and the temperature-compensation factor of a new simple ultrasonic solution-concentration sensor which automatically eliminates temperature dependence using the phase-locked loop method (PLLM) and the phase difference method (PDM). The deviation factor is an essential specification for designing a voltage-controlled oscillator (VCO), a phase detector (PD) and an acoustic cell (AC). It was proved that the deviation factor obtained using the empirical equation is always the same, regardless of the center frequency (f_o) of the VCO in the PLLM and the frequency of the driving oscillator (OSC) (f_D) for the transmitter in the PDM. The deviation factor for a 0.0-1.0% NaCl solution determined by both PLLM and PDM was 0.0078. Moreover, it became clear that the same temperature-compensation factor can be used for determining the concentrations of both NaCl and sugar solutions; this factor is derived from the empirical equations of sound velocity. Specifically, its value in a 0.0-1.0% NaCl solution at f_o = 2.15MHz for PLLM is 3.381kHz/℃, and that in a 0.0-5.0% sugar solution is 3.379kHz/℃. [DOI: 10.1143/JJAP.41.3339]

• 社団法人応用物理学会の論文
• 2002-05-30

著者

• Ikeda Kiyoshi

  Faculty Of Engineering Shinshu University

関連論文

• Ultrasonic Measurement of Concentration in Solutions by a Phase-Locked Loop Method
• Automatic Ultrasonic Measurement of Sound Velocity in Liquids by a Phase Difference Method
• Deviation Factor and Temperature-Compensation Factor of Simple Industrial Ultrasonic Solution-Concentration Sensor Which Automatically Eliminates Temperature Dependence
• Ultrasonic Measurement of Sound Velocity in Liquids by a Phase-Locked Loop

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