Three-dimensional measurement device
a three-dimensional measurement and triangulation technology, applied in the field of three-dimensional measurement devices, can solve the problems of large amount of sunlight-related optical power reaching photosensitive arrays of handheld 3d scanners, large amount of sunlight-related optical power exceeding the optical power projected by the scanner, and reflected off the object under test. , to achieve the effect of reducing inconsistency, reducing inconsistency, and reducing inconsistency
Inactive Publication Date: 2020-09-17
FARO TECH INC
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Benefits of technology
The patent describes an apparatus and method for calibrating a device that includes two cameras and a projector. The apparatus includes a rigid carrying structure with the cameras and projector, and an enclosure surrounding the carrying structure. The structural element separates the cameras from the projector to provide thermal isolation. The calibration procedure involves comparing measured 3D coordinates of features on a calibration plate to reference 3D coordinates of the features and also mathematically determining new values for the relative poses of the cameras and the projector to reduce inconsistency. The technical effects of this invention include improved accuracy and accuracy of 3D measurements and improved calibration efficiency.
Problems solved by technology
One limitation found in handheld 3D scanners today is their relatively poor performance in sunlight.
In some cases, the amount of sunlight-related optical power reaching photosensitive arrays of handheld 3D scanners greatly exceeds the optical power projected by the scanner and reflected off the object under test.
Another challenge in modern handheld scanners is in obtaining adequate cooling while preventing water and dust from entering the scanner interior.
A further challenge is in obtaining high resolution of measured 3D data points while retaining high accuracy.
Still another challenge is in obtaining accurate 3D values of object edges, such as when the edges are sharp.
Today, processing capability of a handheld scanner is limited by the capability of processors within the handheld scanner.
Method used
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[0089]Embodiments of the invention provide for increased ability to use a handheld scanner in sunlight, improved ability to cool laser scanners while protecting against water and dust, ability to obtain increased density of measured 3D points, improved ability to obtain accurate 3D coordinates of sharp edges, and improved and simplified post-processing ability.
[0090]FIG. 1 is a front isometric view of a handheld 3D triangulation scanner 10, also referred to as a handheld 3D imager. In an embodiment, the scanner 10 includes a first infrared (IR) camera 20, a second IR camera 40, a registration camera 30, a projector 50, an Ethernet cable 60 and a handle 70. In an embodiment, the registration camera 30 is a color camera. Ethernet is a family of computer networking technologies standardized under IEEE 802.3. The enclosure 80 includes the outmost enclosing elements of the scanner 10, as explained in more detail herein below. FIG. 2 is a rear perspective view of the scanner 10 further sh...
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A scanner capable of determining 3D coordinates in the presence of bright background light includes a laser and a camera, the laser emitting light at a wavelength adjusted with a thermoelectric cooler, the camera passing the adjusted wavelength through a bandpass filter.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The Present Application is a nonprovisional of, and claims the benefit of, U.S. Provisional Application Ser. No. 62 / 818,923 filed Mar. 15, 2019, the contents of which are incorporated by reference herein in its entirety.BACKGROUND[0002]The subject matter disclosed herein relates to a handheld three-dimensional (3D) measurement device, and particularly to a handheld 3D triangulation scanner.[0003]A 3D triangulation scanner, also referred to as a 3D imager, is a portable device having a projector that projects light patterns on the surface of an object to be scanned. One (or more) cameras, having a predetermined positions and alignment relative to the projector, records images of the light pattern on the surface of an object. The three-dimensional coordinates of elements in the light pattern can be determined by trigonometric methods, such as by using triangulation. Other types of 3D measuring devices may also be used to measure 3D coordina...
Claims
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Login to View More IPC IPC(8): G01B11/00G01K13/00G01K3/00H01L35/02H01L35/30
CPCG01K3/005H01L35/02G01B11/002G01K13/00H01L35/30G01B11/2545G01B11/25G01B11/245H04N13/271G01B5/0014G01S17/48G01S7/481H04N13/239H04N2013/0081H04N13/257H10N10/13H10N10/80
Inventor ATALA, MARCOSBADER, JONASDÖRING, DANIELGRAMENZ, MATTHIASHEIDEMANN, ROLFHILLEBRAND, GERRITOSSIG, MARTIN
Owner FARO TECH INC