Device for evaluating the state of wetting of a surface, evaluation method and associated indication device
First Claim
1. A device for evaluating a state of wetting of a surface, the device comprising:
- at least one emitter able to emit at least one light beam which is incident in a direction of a surface, the surface being able to at least partly reflect the beam;
a single means for receiving the beam reflected by the surface;
means for polarisation comprising at least one first polarisation zone and one second polarisation zone capable of polarising a first part and a second part of the beam in a first polarisation direction and a second polarisation direction respectively, the first part and the second part of the beam having a first wavelength and a second wavelength respectively, the second wavelength being different from the first wavelength, and the means for polarisation being located between the emitter and the surface under analysis;
means for recombining the first part and the second part of the polarized beam in the first polarisation direction and the second polarisation direction respectively in only one beam, the means for recombination being located between the emitter and the surface; and
means for calculation capable of calculating a polarisation ratio between the polarisations of the first part of the reflected beam and the second part of the reflected beam in order to evaluate the state of wetting of the surface.
1 Assignment
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Accused Products
Abstract
A device (2) for evaluating the state of wetting of a surface (8) includes an emitter (4) emitting a beam (F, F1, F2) which is incident in the direction of the surface (8) and a single element (12) for receiving the beam reflected by the surface (8). The device includes: A polarization (10, 13, 14) including a first polarization zone (13) and a second polarization zone (14) designed to polarize a first part (F1) and a second part (F2) of the beam in a first and a second polarization direction; and a evaluation element (28) for calculating a polarization ratio between the polarizations of the first part of the reflected beam and the second part of the reflected beam to evaluate the state of wetting of the surface (8). Also described is an evaluation process and an associated indicator device.
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Citations
12 Claims
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1. A device for evaluating a state of wetting of a surface, the device comprising:
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at least one emitter able to emit at least one light beam which is incident in a direction of a surface, the surface being able to at least partly reflect the beam; a single means for receiving the beam reflected by the surface; means for polarisation comprising at least one first polarisation zone and one second polarisation zone capable of polarising a first part and a second part of the beam in a first polarisation direction and a second polarisation direction respectively, the first part and the second part of the beam having a first wavelength and a second wavelength respectively, the second wavelength being different from the first wavelength, and the means for polarisation being located between the emitter and the surface under analysis; means for recombining the first part and the second part of the polarized beam in the first polarisation direction and the second polarisation direction respectively in only one beam, the means for recombination being located between the emitter and the surface; and means for calculation capable of calculating a polarisation ratio between the polarisations of the first part of the reflected beam and the second part of the reflected beam in order to evaluate the state of wetting of the surface. - View Dependent Claims (2, 3, 4, 8)
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5. A method for evaluating a state of wetting of a surface capable of reflecting at least a part of an incident light beam, comprising:
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emitting at least one incident beam in a direction of the surface by an emitter, polarising at least a first part and a second part of the beam in a first polarisation direction and a second polarisation direction by at least a first polarisation zone and a second polarisation zone respectively, the first part and the second part of the beam having a first wavelength and a second wavelength respectively, the second wavelength being different from the first wavelength, with means for polarisation being located between the emitter and the surface; recombining the first part and the second part of the polarized beam in the first polarisation direction and the second polarisation direction respectively in only one beam, a means for recombining being located between the emitter and the surface; receiving the first part and the second part of the beam polarised by the receiving means; and evaluating the state of wetting of the surface by calculating a polarisation ratio between the polarisation of the first part of the reflected by beam and the second part of the reflected beam by means for calculation. - View Dependent Claims (6, 7)
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9. A device for evaluating a state of wetting of a surface, the device comprising:
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at least one emitter able to emit at least one light beam which is incident in a direction of a surface, the surface being able to at least partly reflect the beam; a single receiver configured to receive the beam reflected by the surface; a polariser comprising at least one first polarisation zone and one second polarisation zone capable of polarising a first part and a second part of the beam in a first polarisation direction and a second polarisation direction respectively, the first part and the second part of the beam having a first wavelength and a second wavelength respectively, the second wavelength being different from the first wavelength, and the polariser being located between the emitter and the surface under analysis; a recombiner of the first part and the second part of the polarized beam in the first polarisation direction and the second polarisation direction respectively in only one beam, the recombiner being located between the emitter and the surface; and a calculator configured for calculating a polarisation ratio between the polarisations of the first part of the reflected beam and the second part of the reflected beam in order to evaluate the state of wetting of the surface. - View Dependent Claims (10, 11, 12)
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Specification