Method of detecting a level of liquid in a moving cylindrical bo

Details Method of detecting a level of liquid in a moving cylindrical bo Method of detecting a level of liquid in a moving cylindrical bo

1990-12-21

1992-04-21

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

141 95, 264 404, G01N 2902, G01F 2328

Patent

active

051056615

ABSTRACT:
A detection method of a liquid level supplies fluid between a moving cylindrical body such as a parison in a film manufacturing process and an ultrasonic transmitter and receiver or an ultrasonic transmitter-receiver opposite to an outer surface of the cylindrical body to keep acoustic contact between an ultrasonic vibration member and the cylindrical body through the fluid. A level of liquid in the cylindrical body is measured on the basis of whether ultrasonic propagating in the fluid and the liquid in the cylindrical body can be received with a predetermined signal level or not. Since the ultrasonic vibration member is brought into contact with the cylindrical body through the fluid, and the contact state therebetween is kept good, and wear, flaw, deformation, frictional heat or the like is not given to the cylindrical body. Further, even if the surface of the cylindrical body is rugged, good contact can be kept.

REFERENCES:
patent: 3102301 (1963-09-01), Dechene
patent: 3745833 (1973-07-01), Armstrong
patent: 3927569 (1975-12-01), Bergdahl et al.
patent: 4203942 (1980-05-01), Sims, Jr. et al.
patent: 4302623 (1981-11-01), Canfield
patent: 4679430 (1987-07-01), Scott-Kestin et al.
patent: 4976149 (1990-12-01), Ichikawa et al.
patent: 4978484 (1990-12-01), Takashige et al.
Chemical Engineers' Handbook, 5th Ed., Perry et al "Sonic Methods" (Copy AU 135), TP 155 p. 4, (pp. 22-47).

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