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Moisture Content Measurement for Green Tea Using Phase Shifts at Two Microwave Frequencies (2000)

Zhang, Yangjun ; Okamura, Seichi

Springer

Subsurface sensing technologies and applications 1 (2000), S. 489-496

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ISSN: 1573-9317

Keywords: moisture content ; measurement method ; microwave ; phase shift ; green tea

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying , Geosciences

Notes: Abstract The experimental results for moisture measurement of green tea usingmicrowave free-space technique are presented. The method is based on a ratioof phase shifts at two microwave frequencies after propagating through asample of green tea. It is shown that the method provides the moisturecontent of tea leaves from 6% to 32% on a dry basis without any knowledge onthe thickness and the density of sample. The mean and the maximum errors inthe moisture determination for tea leaves were 1.2% and 3.7%, respectively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1026571800893

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Measurement of gas hold-up in three-phase systems by ultrasonic technique (1993)

Maezawa, Akinori ; Muramatsu, Shingo ; Uchida, Shigeo ; [et al.]

Weinheim : Wiley-Blackwell

Chemical Engineering & Technology - CET 16 (1993), S. 260-262

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ISSN: 0930-7516

Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: It was established by using double impulse method that the transmission time of an ultrasonic wave, which passes near a bubble, is either shorter or longer than that in the liquid system. This is attributed to the fluid vortex originated by the bubble rising ahead of the wave. The longitudinal distribution of gas hold-up in a three-phase system, measured by analyzing wave shape and reduction of transmission time is in good agreement with that obtained by using the static pressure method. This indicates the possibility of application of ultrasonic techniques to the simultaneous measurement of phase hold-ups in the three-phase system.

Additional Material: 4 Ill.