Optical method and apparatus for determining a characteristic such as volume and density of an excavated void in a construction material

• US 9,273,951 B2
• Filed: 06/06/2012
• Issued: 03/01/2016
• Est. Priority Date: 06/06/2011
• Status: Active Grant

• Current Assignee: Troxler Electronic Laboratories, Inc.
• Original Assignee: Troxler Electronic Laboratories, Inc.
• Inventors: Troxler, Robert Ernest
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): ROY, PUNAM P
• Application Number:
  US13/490,398
• Publication Number:
  US 20120304763A1
• Time in Patent Office: 1,364 Days
• US Class Current: 1/1
• CPC Class Codes: G01B 11/00 Measuring arrangements characterised by the use of optical techniques
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01N 33/383 Concrete or cement
• CPC Class Codes: G01N 33/42 Road-making materials G01N33/38 takes precedence
• CPC Class Codes: G01N 9/00 Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity

Abstract

One or more methods and apparatuses for determining a characteristic, such as volume, of an excavated void of a construction material are provided. The one or more methods may include excavating a void defined in a construction material, interacting with the void using a material interacting device for determining at least one measurement thereof, manipulating the at least one measurement to determine a characteristic of the void such as the volume thereof, obtaining at least one measurement of the material, and determining a characteristic of the void based on the measurements obtained. The apparatus may include at least one material interacting device configured to interact with a surface of a construction material and a surface of a void defined therein for determining at least one respective measurement thereof and manipulate a plurality of the at least one measurement so as determine a characteristic of the void.

Claims

1. A method comprising:

optically interacting with a void excavated in a construction material using a material interacting device for determining at least one measurement thereof;

manipulating the at least one measurement to determine a dimensional characteristic of the void;

determining mass of material excavated to form the void;

determining a moisture content of the excavated material; and

determining a material characteristic of the construction material prior to the excavation based on the dimensional characteristic of the void and the determined mass of the excavated material, and wherein determining a material characteristic of the excavated material comprises determining the construction characteristic based on the moisture content.

2. The method according to claim 1, further including interacting with the construction material using the material interacting device for determining the at least one measurement thereof.

3. The method according to claim 2, further including manipulating a plurality of the at least one measurements of the construction material for determining a characteristic thereof.

4. The method according to claim 3, further including manipulating the determined characteristic of the construction material and the determined characteristics of the void so as to determine at least one of a volume of the void and to determine density of the construction material prior to excavation.

5. The method according to claim 1, further including projecting one of a light point, a light line, or a wave front on a surface of the construction material for interacting therewith.

6. The method according to claim 1, further including projecting one of a light point, a light line, or a wave front into the void for interacting therewith.

7. The method according to claim 1, further including using one of sound, ultrasound, light, and radiation for interacting with the void or construction material.

8. The method according to claim 1, wherein the material interacting device further comprises at least one sample-imaging device and the characteristic further comprises at least a partial image of the void.

9. The method according to claim 1, wherein, before interacting with the void defined in the construction material, excavating material from the construction material to form the void.

10. The method according to claim 9, further including determining a density of the construction material.

11. The method according to claim 10, wherein the density is one of a wet density and a dry density.

12. The method of claim 10, wherein determining a density comprises determining one of a wet density or a dry density of the material in-situ.

13. The method of claim 12 where obtaining dry density is accomplished by correcting wet density, or directly obtaining dry density with the mass of dry soil and volume of the hole.

14. The method according to claim 1, wherein determining a moisture content comprises determining a moisture content using one of direct heating, a mass measuring device, time-domain reflectometry (TDR), capacitive measurements including DC, AC, single or swept frequency complex impedance, microwave heating, microwave impedance, calcium carbide meters, electromagnetic methods, magnetic resonance, and ground penetrating radar (GPR) techniques.

15. The method of claim 1, further comprising determining the moisture content of the excavated material one of before or after the material is excavated.

16. The method of claim 1, further comprising heating the excavated material.

17. The method of claim 1, further comprising obtaining at least a mass of the excavated material.

18. The method of claim 1, further comprising using one of an electromagnetic technique, time-domain reflectometry (TDR), capacitive measurements including DC measurements, AC, single and swept frequency complex impedance, microwave heating, microwave impedance, calcium carbide meters, a mass measuring device, electromagnetic methods, magnetic resonance, and ground penetrating radar (GPR) techniques.

19. The method of claim 1, wherein optically interacting comprises using an optical technique to determine a dimensional characteristic of the void using at least one of structured light, range finder, confocal scanning, stereo-vision, 3D profiling, scanners, cameras stereo triangulation, light sheet triangulation, time of flight, and coded aperture.

20. An apparatus comprising:

at least one material interacting device configured to;

optically interact with a void in a construction material for determining at least one measurement thereof;

computer hardware configured to;

manipulate a plurality of the at least one measurement so as determine a characteristic of the void;

determine mass of material excavated to form the void; and

determine a material characteristic of the construction material prior to the excavation based on the dimensional characteristic of the void and the determined mass of the excavated material; and

a frame for engaging with the construction material, and the material interacting device is carried by the frame.

21. The apparatus according to claim 20, further configured to interact with the construction material for determining the at least one measurement thereof.

22. The apparatus according to claim 20, wherein the material interacting device is configured for being placed in the void.

23. The apparatus according to claim 20, wherein the material interacting device is configured for interacting with the surface of the void without being placed into the void.

24. The apparatus according to claim 20, wherein the material interacting device is translatable between a first position spaced-apart from the void and a second position in which the material-interacting device is within the void.

25. The apparatus according to claim 20, wherein the material interacting device is translatable between a first position spaced-apart from the void and a second position in which the material-interacting device is not within the void.

26. The apparatus according to claim 20, wherein the material interacting device is configured to determine a characteristic of the void by manipulating a plurality of the at least one measurement, wherein the at least one measurement are captured when the material interacting device is at more than one relative position.

27. The apparatus according to claim 26, further comprising a mass measuring device in communication therewith for determining a density of the excavated material while in situ.

28. The apparatus according to claim 27, wherein the determined density is one of a wet density and a dry density.

29. The apparatus according to claim 20, wherein the material interacting device is configured to determine a moisture characteristic of the excavated material using infrared (IR) measurements, time-domain reflectometry (TDR), capacitance, impedance, electromagnetic, magnetic resonance, volumetric and gravimetric techniques.

30. The apparatus according to claim 20, further configured to interact with the boundary surface of the void defined for determining respective volume defined between about the apparatus and the boundary surface of the void.

31. The apparatus according to claim 20, wherein the material interacting device is configured to determine a characteristic of the void by manipulating a plurality of the at least one measurement, and wherein the material interacting device is configured to capture the at least one measurement when the material interacting device interacts with multiple lenses.

32. The apparatus of claim 20, wherein the at least one material interacting device comprises at least one of an optical projector or receiver configured to determine a dimensional characteristic of the void using at least one of structured light, range finder, confocal scanning, stereo-vision, 3D profiling, scanners, cameras stereo triangulation, light sheet triangulation, time of flight, and coded aperture.

33. A method comprising:

excavating a void defined in a construction material;

interacting with the void using a material interacting device for determining at least one measurement thereof;

manipulating the at least one measurement to determine a characteristic of the void;

obtaining at least one measurement of the material; and

determining a characteristic of the void of the construction material based on a determined dry density of the construction material in-situ.

34. The method according to claim 33, wherein determining a characteristic of the void comprises determining a wet density of the material in-situ.

35. The method according to claim 33, wherein determining a dry density of the material excavated comprises heating the material excavated.

36. The method according to claim 33, wherein, before interacting with the void defined in the construction material, excavating material from the construction material to form the void.

37. The method according to claim 36, further including determining a density of the excavated material in-situ.

38. The method according to claim 37, wherein the density is one of a wet density and a dry density.