Fiber optic level alarm

Details Fiber optic level alarm Fiber optic level alarm

1989-06-16

1991-12-17

Will, Thomas B.

Measuring and testing

Liquid level or depth gauge

With illumination

73327, 250577, G01F 2302

Patent

active

050726161

ABSTRACT:
A device for determining the level of water and/or steam in a boiler is disclosed. The device is a liquid level gauge (10) of the Blackburn type and utilizes an optical fiber cable (44) to intercept the light that passes in a relatively straight path through a cross passage (16) in the body (12) of gauge (10). Due to the difference in the indices of refraction of steam and water, the optical fiber cable (44) intercepts the light when steam is present in the gauge (10) but does not intercept the light when water is present.

REFERENCES:
patent: 2024815 (1935-12-01), Blackburn
patent: 2115899 (1938-05-01), Blackburn
patent: 2198443 (1940-04-01), Paul et al.
patent: 2490627 (1949-12-01), Hofberg
patent: 3505868 (1970-04-01), Goellenger
patent: 3510641 (1970-05-01), Reynolds
patent: 3553666 (1971-01-01), Melone
patent: 3713338 (1973-01-01), Kind
patent: 4217778 (1980-08-01), Thayer
patent: 4355238 (1982-10-01), Ruell
patent: 4387594 (1983-06-01), Berthold
patent: 4397182 (1983-08-01), Bakul
patent: 4450722 (1984-05-01), Keyes, IV et al.

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