Method and apparatus for determining an ultraviolet (UV) cure level

Patent metadata

Field	Value
Publication number	US-10436758-B2
Application number	US-201715625783-A
Country	US
Kind code	B2
Filing date	Jun 16, 2017
Priority date	Jun 16, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A method for determining an ultraviolet (UV) cure level of a material is disclosed. For example, the method includes receiving an object with the material that is cured via a UV light source, controlling a heat source to heat the material, measuring a parameter of the material in response to the heat, determining the UV cure level of the material based on the parameter that is measured and a predefined response of the material at a temperature associated with the heat, and generating a signal to display the UV cure level in response to the determining.

First claim

What is claimed is:

1. A method for determining an ultraviolet (UV) cure level of a material, comprising:
moving, by a processor, a platform to receive an object with a plurality of layers of the material that is printed in a three-dimensional printer and is cured via a UV light source;
controlling, by the processor, a heat source to heat a point on a top layer of the material;
measuring, by the processor, a parameter of the material in response to the heat;
determining, by the processor, the UV cure level of the material based on the parameter that is measured and a predefined response of the material at a temperature associated with the heat; and
generating, by the processor, a signal to display the UV cure level in response to the determining.

2. The method of claim 1 , wherein the material comprises a photopolymeric material.

3. The method of claim 1 , wherein the heat source comprises a point source.

4. The method of claim 1 , wherein the measuring is performed by an interferometer.

5. The method of claim 1 , wherein the parameter comprises one or more properties of a Rayleigh wave generated in the material in response to the heat.

6. The method of claim 5 , wherein the one or more properties comprise a loss modulus value and a storage modulus value.

7. The method of claim 6 , wherein the predefined response comprises a graph of the loss modulus value of the material that is known to be fully cured at a plurality of different temperatures.

8. The method of claim 6 , wherein the predefined response comprises a graph of the storage modulus value of the material that is known to be fully cured at a plurality of different temperatures.

9. The method of claim 1 , wherein the UV cure level of the material comprises a fully cured level when the parameter that is measured matches the predefined response of the material at the temperature within a predefined threshold.

10. The method of claim 1 , wherein the UV cure level of the material comprises an insufficient cured level when the parameter that is measured does not match the predefined response of the material at the temperature within a predefined threshold.

11. A non-transitory computer-readable medium storing a plurality of instructions, which when executed by a processor, cause the processor to perform operations for determining an ultraviolet (UV) cure level of a material, the operations comprising:
moving a platform to receive an object with a plurality of layers of the material that is printed in a three-dimensional printer and is cured via a UV light source;
controlling a heat source to heat a point on a top layer of the material;
measuring a parameter of the material in response to the heat;
determining the UV cure level of the material based on the parameter that is measured and a predefined response of the material at a temperature associated with the heat; and
generating a signal to display the UV cure level in response to the determining.

12. The non-transitory computer-readable medium of claim 11 , wherein the material comprises a photopolymeric material.

13. The non-transitory computer-readable medium of claim 11 , wherein the heat source comprises a point source.

14. The non-transitory computer-readable medium of claim 11 , wherein the measuring is performed by an interferometer.

15. The non-transitory computer-readable medium of claim 11 , wherein the parameter comprises one or more properties of a Rayleigh wave generated in the material in response to the heat.

16. The non-transitory computer-readable medium of claim 15 , wherein the one or more properties comprise a loss modulus value and a storage modulus value.

17. The non-transitory computer-readable medium of claim 16 , wherein the predefined response comprises a graph of the loss modulus value of the material that is known to be fully cured at a plurality of different temperatures.

18. The non-transitory computer-readable medium of claim 16 , wherein the predefined response comprises a graph of the storage modulus value of the material that is known to be fully cured at a plurality of different temperatures.

19. The non-transitory computer-readable medium of claim 11 , wherein the UV cure level of the material comprises a fully cured level when the parameter that is measured matches the predefined response of the material at the temperature within a predefined threshold.

20. A method for determining an ultraviolet (UV) cure level of a material, comprising:
moving, by a processor, a platform to receive an object with a plurality of layers of the material that is printed in a three-dimensional printer and is cured via a UV light source;
controlling, by the processor, a laser to heat a point of a surface of a top layer of the material;
measuring, by the processor, a loss modulus value and a storage modulus value via a Rayleigh wave of the material caused by the heat;
determining, by the processor, the UV cure level of the material comprises a fully cured level based on the loss modulus value and the storage modulus value matching a known loss modulus value and a known storage modulus value of the material at a temperature associated with the heat; and
generating, by the processor, a signal to display that the material is fully cured in response to the determining.

Assignees

• Xerox Corp

Inventors

• Mcconville Paul
• Lefevre Jason M
• Herrmann Douglas K
• Levy Michael J
• Praharaj Seemit

Classifications

• C08J2300/00

  Characterised by the use of unspecified polymers · CPC title

• G01N33/442

  Resins; Plastics · CPC title

• G01N25/00

  Investigating or analyzing materials by the use of thermal means (G01N3/00 - G01N23/00 take precedence) · CPC title

• G01N2291/02827

  Elastic parameters, strength or force · CPC title

• G01N29/2418

  using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics (photoacoustic cells G01N21/1702; measuring characteristics of vibrations by using radiation-sensitive means G01H9/00; acousto-optical conversion techniques for short-range imaging G01S15/8965; sound-producing devices using laser bundle G10K15/046) · CPC title