Browse Prior Art Database

Measuring the Rate of Liquid-Bubbling

IP.com Disclosure Number: IPCOM000096671D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Armitage, JD: AUTHOR

Abstract

The upper drawing shows a closed loop process control system. The process relates to heating steel 16 by furnace 14. The process control system detects the rate and type of bubbling in steel 16 and controls furnace 14.

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Measuring the Rate of Liquid-Bubbling

The upper drawing shows a closed loop process control system. The process relates to heating steel 16 by furnace 14. The process control system detects the rate and type of bubbling in steel 16 and controls furnace 14.

The rate and type of bubble is detected by light 10, semi-transparent mirror 17, lens 11 and detector 12. The amount of light which is reflected from the surface of steel 16 is a function of the rate and type of bubbling. The light is reflected by one-way mirror 17 and is detected by detector 12. Circuit 13 performs a Fourier analysis on the signal from detector 12. Such determines the relative magnitude of the high and low frequency components of the output signal from detector 12. Furnace 14 is in part controlled by circuitry 13 in response to the frequency components in the signals from detector 12.

The bottom drawings show that, if the output of detector 12 varies at a high rate, the Fourier components are greater at the relatively high frequencies. Also, if the signal from detector 12 varies at a relatively slow rate, the Fourier components of the signal are greater at the relatively low frequencies.

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