Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

The majority of conventional liquid level monitors in industry operate using a gamma-ray absorption technique. Gamma-rays with energies utilised in these machines are strongly absorbed by water/liquids. In a γ -ray measurement a collimated beam is momentarily exposed to the container that is to be measured, with some of the beam below and some above the nominal liquid level. The γ-rays are detected using a scintillation tube after passing through the container and its contents. Thus if more of the γ -ray beam is absorbed by a higher liquid level, the counts drop, and vice-versa. The type of machine is in the main a pass/fail monitor — that is it passes a can if the liquid level is above a predetermined height, and rejects it if it is not. There are several problems associated with the use of γ -ray based systems, most notably environmental considerations, the fact they are potentially hazardous and subject to strict legislation.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17B

Chapter

Chapter 8: Systems, Reliability, Training

Section

New Systems

Pages

1929-1935

DOI

10.1007/978-1-4615-5339-7_250

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

A Novel Non-Contact Ultrasonic System for Liquid Level Measurement in Moving Metallic Containers

La Jolla, CA

The majority of conventional liquid level monitors in industry operate using a gamma-ray absorption technique. Gamma-rays with energies utilised in these machines are strongly absorbed by water/liquids. In a γ -ray measurement a collimated beam is momentarily exposed to the container that is to be measured, with some of the beam below and some above the nominal liquid level. The γ-rays are detected using a scintillation tube after passing through the container and its contents. Thus if more of the γ -ray beam is absorbed by a higher liquid level, the counts drop, and vice-versa. The type of machine is in the main a pass/fail monitor — that is it passes a can if the liquid level is above a predetermined height, and rejects it if it is not. There are several problems associated with the use of γ -ray based systems, most notably environmental considerations, the fact they are potentially hazardous and subject to strict legislation.