Apparatus, systems, and methods for inspecting a part

Patent metadata

Field	Value
Publication number	US-10996162-B2
Application number	US-201816175654-A
Country	US
Kind code	B2
Filing date	Oct 30, 2018
Priority date	Apr 22, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

Described herein is an apparatus, for shielding light generated by a laser during non-destructive inspection of an object. The apparatus includes a light shield at least partially enveloping the laser and defining a first opening through which light generated by the laser passes from the laser to the object. The light shield is opaque and includes at least one first biasing mechanism. The apparatus also includes at least one first light seal coupled to the light shield about the first opening of the light shield. The at least one first biasing mechanism is configured to urge resilient deformation of the at least one first light seal against the object. When the at least one first light seal is resiliently deformed against the object, light generated by the laser is constrained within a light containment space defined between the light shield, the at least one first light seal, and the object.

First claim

What is claimed is:

1. A method of non-destructively inspecting an object, the method comprising:
forming a light containment space adjacent the object;
generating a laser light within the light containment space for transmitting into the object;
while keeping the object stationary, co-moving the light containment space and the laser light relative to the object; and
detecting light escaping from the light containment space at one or more light sensors located at an intersection of the light containment space and a first surface of the object.

2. The method according to claim 1 , further comprising detecting a reflected laser light beam at a light detector located in the light containment space, wherein the reflected laser light beam comprises at least a portion of the laser light, generated within the light containment space, that reflects off of the first surface of the object.

3. The method according to claim 2 , wherein:
the method comprises co-moving the light containment space and the laser light relative to the object; and
the method further comprises co-moving the light detector with the light containment space and the laser light relative to the object.

4. The method according to claim 3 , further comprising
co-moving the one or more light sensors with the light containment space and the light detector relative to the object, wherein the light detector is offset from the first surface of the object.

5. The method according to claim 4 , further comprising disabling generation of the laser light in response to the one or more light sensors detecting a threshold level of light.

6. The method according to claim 4 , further comprising detecting a portion of the laser light, that does not reflect off of the first surface of the object, at a second light sensor located offset from a second surface of the object, opposite the first surface of the object, and located closer to second surface of the object than the first surface of the object.

7. The method according to claim 6 , further comprising disabling generation of the laser light in response to the second light sensor detecting a threshold level of light.

8. The method according to claim 6 , further comprising co-moving the second light sensor with the light containment space, the one or more light sensors, and the laser light relative to the object.

9. The method according to claim 1 , further comprising diagnosing structural health of the object in response to at least one characteristic of reflected laser light beam detected by light detector.

10. The method according to claim 1 , further comprising:
resiliently biasing one or more light seals against the object with at least one biasing mechanism; and
sealing the light containment space against the object with the one or more light seals;
wherein resiliently biasing the one or more light seals against the object with the at least one biasing mechanism causes the one or more light seals to deform against the object.

11. The method according to claim 1 , further comprising resiliently adjusting a volume of the light containment space while the light containment space is adjacent the object.

12. A method of non-destructively inspecting an object, the method comprising:
forming a light containment space adjacent the object;
generating a laser light within the light containment space for transmitting into the object;
detecting a reflected laser light beam at a light detector located in the light containment space, wherein the reflected laser light beam comprises at least a portion of the laser light, generated within the light containment space, that reflects off of a first surface of the object;
while keeping the object stationary, co-moving the laser light and the light detector relative to the object and the light containment space;
detecting light escaping from the light containment space at one or more light sensors located at an intersection of the light containment space and first surface of the object, wherein the light detector is offset from the first surface of the object; and
moving the light detector relative to the one or more light sensors.

13. The method according to claim 12 , further comprising disabling generation of the laser light in response to the one or more light sensors detecting a threshold level of light.

14. The method according to claim 12 , further comprising:
detecting light escaping from the light containment space at one or more second light sensors located at an intersection of the light containment space and a second surface of the object, opposite the first surface of the object; and
co-moving the one or more second light sensors and the light detector relative to the one or more first light sensors.

15. The method according to claim 12 , further comprising:
detecting light escaping from the light containment space at one or more second light sensors located at an intersection of the light containment space and a second surface of the object, opposite the first surface of the object; and
moving the light detector relative to the one or more light sensors and the one or more second light sensors.

16. The method according to claim 12 , further comprising detecting a portion of the laser light, that does not reflect off of the first surface of the object, at a second light sensor located offset from a second surface of the object, opposite the first surface of the object, and located closer to second surface of the object than the first surface of the object.

17. The method according to claim 16 , further comprising disabling generation of the laser light in response to the second light sensor detecting a threshold level of light.

18. The method according to claim 16 , further comprising:
moving the second light sensor relative to the light containment space; and
co-moving the second light sensor and the light detector relative to the one or more light sensors.

19. A method of non-destructively inspecting an object, the method comprising:
forming a light containment space adjacent the object;
generating a laser light within the light containment space for transmitting into the object;
detecting a reflected laser light beam at a light detector located in the light containment space, wherein the reflected laser light beam comprises at least a portion of the laser light, generated within the light containment space, that reflects off of a first surface of the object;
while keeping the object stationary, co-moving the laser light and the light detector relative to the object and the light containment space;
wherein:
the object comprises a hole; and
moving the laser light relative to the object comprises moving the laser light along a circular path about the hole while keeping light containment space stationary relative to the hole.

20. The method according to claim 19 , further comprising:
detecting light escaping from the light containment space at one or more light sensors located at an intersection of the light containment space and first surface of the object; and
disabling generation of the laser light in response to the one or more light sensors detecting a threshold level of light.

Assignees

• Boeing Co

Inventors

• Georgeson Gary E
• Motzer William P
• Garvey Jeffry J
• Lea Scott W
• Kennedy James C
• Brady Steven K
• Stewart Alan F
• Bingham Jill P

Classifications

• G01N29/043 Primary

  in the interior, e.g. by shear waves · CPC title

• G02B7/22

  Extensible connections, e.g. bellows · CPC title

• G01N2201/06113

  Coherent sources; lasers · 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

• G01N21/1702 Primary

  with opto-acoustic detection, e.g. for gases or analysing solids · CPC title