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Abstract
A New and efficient method of measuring on-line density of a process liquid has been developed. The sensor is a piezoelectrically excited vibrating tuning fork structure whose vibration amplitude is maximum at its resonance frequency. This resonance frequency is a function of the mass or density of the surrounding medium in which fork is put. The tuning fork is excited at frequencies sweeping from 800 Hz to 1 kHz in steps of about 5 Hz. The resonant amplitude is sensed by another piezoelectric crystal mounted on the other tine of fork. Once resonant frequency is crudely estimated, the step size is reduced to about 2 Hz and a short sweep cycle allowed to run around the resonant frequency to accurately determine the resonance frequency. A microcontroller based electronic circuit controls and measures the resonant frequency and converts it into density. The instrument has been calibrated in the laboratory.
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Notes on contributors
Amod Kumar
Amod Kumar received BE (Hons.) degree in Electrical and Electronics Engineering from Birla Institute of Technology and Science, Pilani (Raj.) in 1979 and ME degree in Electronics Engineering from Punjab University, Chandigarh in 1985. He has about 25 years experience in Research and Development of Process Control instruments. He is currently working as scientist in Central Scientific Instruments Organisation, Chandigarh. He has 6 publications in reputed journals and also presented more than 7 papers in National conferences. He visited Germany under DAAD fellowship in 1987–88. His areas of interest are Digital Signal Processing and Fuzzy Control.
Shashi Sharma
Shashi Sharma received BE degree in Electronics and Communication Engineering from Institution of Engineers (India) Kolkata in 1989 and MTech degree in Instrumentation from Punjab University, Chandigarh in 1999, She has over 21 years experience in Research and Development of Process Control instruments. She is currently working as Technical Officer in Central Scientific Instruments Organisation, Chandigarh, She has 4 publications in reputed journals and also presented more than 2 papers in National conferences. Her areas of interest are Microprocessor, Microcontroller and PC based Instrumentation.