Liquid level detecting device and method for producing the same
US4468567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | May 17, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S250/906
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A liquid level detecting device, which has a low transmission loss and may be miniaturized, comprising a plurality of optical fibers each composed of a core made of a transparent material and a cladding layer covering the core therewith and made of another transparent material having a lower refractive index than that of the former transparent material forming the core, end portions of the optical fibers being placed in adjacent to each other in either parallel arrangement or that attained by making an acute angle with each other, and a detecting portion which is obtained by heating the adjacent end portions of these optical fibers to fuse one another and shaping into a spherical form due to the surface tension of the fused material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.