EP0194732A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Sensor for the measurement of the refractive index of a fluid and/or phase boundary between two fluids by means of visible or invisible light
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1986-03-12
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Granted: —
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Expires: 2006-03-12
Abstract
Abstract A sensor for the measurement of the refractive index of a fluid and/or phase boundary between two fluids comprises a light guide in the form of a rod; one end of the rod is connected to both a light source and a detection element and the other end of the rod is reflective. If the sensor is used in a refractive index gauge the measurement should be independent of the liquid level; if the sensor is used in a level gauge, a digital measurement should be possible. The coating is provided with one or more cut-outs consisting of windows which are in direct contact with the surrouding fluid.
Inventors
- 👤 Pieter Marcus Houpt
- 👤 Wielandt Ralph Tadema
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 05:20
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284; G01F23/292; G01N; G01N21/00; G01N21/17; G01N21/41; G01N21/43; G01N21/431; Y; Y10; Y10S; Y10S250/00; Y10S250/90; Y10S250/904; Y10S250/905; Y10S250/907
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
1 . Sensor for the measurement of the refractive index of a fluid and/or the phase boundary between two fluids with visible or invisible light, which sensor comprises a light guide in the form of a rod with a refractive index greater than that of the fluid or fluids respectively, one end of the rod being connected to both a 4ight source and a detection element sensitive to reflected light and the other end of the rod being reflective, and a cladding around the rod being provided with one or more cut-outs, characterized in that the specified cladding consists of a coating of reflective material bonded to the surface of the rod and that the cut-outs consist of windows which are in direct contact with the surrounding fluid.
Claim 2
Dependent Claim
128 words
1 . Sensor for the measurement of the refractive index of a fluid and/or the phase boundary between two fluids with visible or invisible light, which sensor comprises a light guide in the form of a rod with a refractive index greater than that of the fluid or fluids respectively, one end of the rod being connected to both a 4ight source and a detection element sensitive to reflected light and the other end of the rod being reflective, and a cladding around the rod being provided with one or more cut-outs, characterized in that the specified cladding consists of a coating of reflective material bonded to the surface of the rod and that the cut-outs consist of windows which are in direct contact with the surrounding fluid.
Claim 3
Dependent Claim
25 words
Sensor according to Claim 1, characterized in that a number of windows are provided with a mutual distance in the axial direction of the rod.
Claim 4
Dependent Claim
34 words
Sensor according to Claim 1 or 2 intended for refracted index measurement of a liquid, characterized in that the windows lie below the level at which liquid is located around the rod during operation.
Claim 5
Dependent Claim
46 words
Sensor according to Claim 1 or 2 intended for level measurement of a liquid, characterized in that the windows consist of a number of openings of low height, these openings being located both above and below the distance between which the liquid level fluctuates during use.
Claim 6
Dependent Claim
14 words
Sensor according to Claim 4, characterized in that the openings consist of thin rings.
Claim 7
Dependent Claim
17 words
Sensor according to Claim 4 or 5, characterized in that the windows have a different surface area.
Claim 8
Dependent Claim
81 words
Sensor according to Claim 2 intended both for the measurement of the refracted index of a liquid and for the measurement of the level of a liquid, characterized in that, of a series of windows situated at a distance from each other in the axial direction, only the uppermost windows consist of rings for the determination of the position-of the liquid level and the other windows have a large surface area and are intended for the determination of the refracted index.
Claim 9
Dependent Claim
31 words
Sensor according to one of the preceding claims, characterized in that the rod is fork-shaped, the light source and the detection element being situated on the two teeth of the fork.
Claim 10
Dependent Claim
17 words
Sensor according to one of the preceding claims, characterized in that the coating is a gold layer.
Claim 11
Dependent Claim
17 words
Rechargeable battery, in particular lead/sulphuric acid cell, with built-in sensor according to one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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