Contour Plotting by a Sonic Phase Lock Loop
The use of a sound wave as a measurement tool is increasing for a number of reasons. Medically it is a benign ray. Scientifically it is a means of measuring with the minimum of disturbance and in an engineering sense it provides digital information which is readily processed by a computer. However, sonic measurements have largely used a pulse-echo technique which has been refined to a high degree by advances in electronic circuitry and components. Effort has been concentrated in the ultrasound region for practical reasons.
KeywordsAutomatic Gain Control Voltage Control Oscillator Electronic Circuitry Fluid Path Sonic Measurement
Unable to display preview. Download preview PDF.
- 1.British Patent Specification No. 1,523,231 et seq. U.S. Patent No. 4,119,950 etc.Google Scholar
- 2.A New Genus of Transducer? R.J. Redding, “Measurement and Control”, Vol.13, pp 27–30, January 198oGoogle Scholar
- 3.Sound Beams for Fire Alarm and Gas Detection Systems. “Fire”, March 1980Google Scholar
- 4.Paper to I.E.E.E. Ultrasonics Symposium, Boston, November, 1980Google Scholar