Active optical detector
AssigneeUniversite Joseph Fourier
InventorsEric Lacot, Frederic Stoeckel
Life of this patent
Estimating the term…
Abstract
Disclosed is a modidied acrylic coating composition cured with melamine characterized by improved inpact resistance which comprises: An acrylic polyol dissolved in a suitable solvent to 40-90% solids; 2 to 50% by weight of said acrylic polyol subatituted with a polytrimethylene carbonate polyol selected from a polytrimethylene carbonate diol, a polytrimethylene carbonate triol, or a higher functionality polytrimethylene carbonate polyol; a melamine crosslinking agent; optionally a catalyst; and optionally pigments and other additives commonly used in coatings. Also disclosed in a related embodiment is a melamine/urea formaldehyde polytrimethylene carbonate coating composition that is prepared without acrylic.
Claims6
An optical sensor, comprising:
- a class B laser source (1) emitting a beam (3) at a first optical frequency;
- means (4) interacting with the beam (3) to provide a radiation (5) at a modified optical frequency, the shifting between the first frequency and the modified frequency being close to a relaxation frequency of the laser:
- means (6) for irradiating a selected area of a medium to be studied with the radiation at the modified frequency;
- means (6;
- 6′;
- 12″) for injecting into the laser the light sent back by the selected area;
- and
- means (9, 14, 15, 16) for detecting the disturbance brought to the laser emission by the reinjected light.
Dependencies are inferred from the claim text.