Standard calibration target set with protective carrying case

2DCalibration Overview/ 2D Calibration Overview

The calibration process of VIC-2D system is very fast and simple. Simply click the "Calibration Scale" button under the Calibration option in the VIC-2D software to easily complete the task. When absolute scale information is required, it must be referenced and calibrated through images containing known distance points, such as specimens with surface markings of known distancesImages, or images of rulers, calibration plates, and targets located on the same plane as the specimen. At this point, you only need to select a corresponding scale unit (such as millimeters, inches, etc.) to replace pixels as the measurement unit. When using the VIC-3D calibration plate target as a known distance calibration reference, the accuracy can reach sub-pixel level.

The process of calibrating a VIC-2D system is quick and simple. The procedure issoftware basedand can be performed quite easily by clicking the “Calibrate Scale” button under the Calibration option in the VIC-2D program. To calibrate for scale, you must have an image which contains a known distance, either marked on the specimen or on a ruler or target that is in the same plane as the specimen. Here, you simply choose a dimension (mm, inches, etc.) to replace pixels as a form of measurement. If a VIC-3D calibration target is used to define the known distance,subpixel accuracycan be achieved.

3DCalibration Overview/ 3D Calibration Overview

The calibration of VIC-3D system is quite simple and has been optimized to almostAutomatic processThe calibration of this system only requires the arbitrary movement and deflection of a rigid calibration plate target in front of the 3D camera system for imaging, and then it can be doneAnalysis is sufficient. The calibration process will accurately calculate the internal and external parameters of the image collector, while obtaining the triangulation positioning relationship of the image acquisition system andRemove optical distortion from the lensThis ultimately eliminated all measurement deviations and defined a 3D coordinate system on the surface of the specimen. The entire process is typically time-consumingOnly 1-3 minutes are needed.

Calibrating a VIC-3D system is straightforward and has been streamlined to a nearlyautomatic process. The procedure for the 3D system involves moving, imaging, and analyzing a rigid calibration target in front of a stereo camera pair. This precisely calculates the cameras’ intrinsic and extrinsic parameters while triangulating the cameras’ positions and removing lens distortions. This ultimately removes any measurement bias and defines a three-dimensional coordinate system on the specimen’s surface. This entire process typicallytakes 1-3 minutes.

Overview of Calibration Plate Target/ Calibration target Overview

CSI provides various types of calibration plate targets, such as standard plate targets, double-sided plate targets, glass plate targets, microscope plate targets, and infrared plate targets. Each calibration plate target corresponds to a different type of application and field of view. To learn more about the board target dot matrix required for your applicationFor type information, please read the various functions, uses, and corresponding systems of these board targets listed and described below.

There are many types of calibration targets available at Correlated Solutions, such as Standard Targets, Double Sided Targets, Glass Targets, Microscope Targets, and IR Targets. Each calibration target is needed for a different type of application and/or field of view. To find out more information on the type of gird you have or need for your application, we have listed and described each of these target’s features, purposes, and corresponding systems below.

Standard calibration board target/ The Standard Calibration Target (30mm+)

Each VIC-3D ™ The system is equipped with a standard calibration board target kit, coveringField of view of 30mm and aboveEach board target has a super matte surface and a sturdy and durable design, and their unique identifiable coding points between different specifications can also achieve VIC-3D v7 and higher versionsAutomatic spacing detectionFunction. These targets can be used for calibration of high-speed and low-speed systems, as well as high-resolution and low resolution cameras. If precise calibration plate targets are requiredVerification, CSI company also provides traceability certificates from the National Institute of Standards and Technology (NIST) in the United States, and provides detailed measurement reports on lattice spacing parameters.

The Standard Calibration Target set is provided with each VIC-3D™ System and covers fields of view from30mm and up. Each target features an ultra matte finish, a rigid & durable design, and they are specially coded forautomatic spacing detectionin VIC-3D v7 and later. These targets can be used for calibrating high-speed and low-speed systems and for both high and low resolution cameras. If exact calibration target measurements are needed, Correlated Solutions’ can provideNIST traceablecertificates which provide detailed measurements on spacing parameters.

When you encounter boards with special application sizesTarget or need to replace boardWhat should we do when targeting? CSI has givenUser made calibration boardtargetthe abilityThe user-friendly target generator can be downloaded from here:cal_gen.exe（7MB）。 Users must use high-resolution laser printers to print their own targets, ensuring flatness and evenness, and more importantly, using high rigidity boards for production.

Need to replace a target? Users have the ability to create their own standard calibration targets. The user friendly Calibration Target Generator can be downloaded here: cal_gen.exe (7MB). Self-printed targets must utilize a high-resolution laser printer, and must be adhere to a flat, but more importantly, rigid plate.

Large scale calibration/ Large Scale Calibrations (2m+)

The largest calibration plate target (36 "x 24") manufactured by CSI company can calibrate a field of view as large as 2 meters. When a larger field of view needs to be calibrated, the single plate target technology will no longer be applicable (due to insufficient rigidity) or the manufacturing cost will be high. To solve this problem, CSI company has adopted an intelligent calibration technology called "external directional calibration". This is a two-step calibration technique, first using a small standard calibration plate to calibrate the targetCalibrate each camera separatelyThen use the known distance on the surface of the specimen as the scale calibration. This is for oneThe initially serious problem provided a very accurate, low-cost, and practical solution. This technology also demonstrates the robustness of VIC-3D products and the flexibility of calibration procedures.

The largest target (36″ x 24″) made by Correlated Solutions calibrates a field of view up to about two meters. If calibrating a larger field of view is required, a single target is no longer practical to use or cost effective to produce. To handle this problem, Correlated Solutions has implemented an intelligent calibration technique called “External Orientation Calibration.” This is a two step technique that firstcalibrates each camera individuallywith a small standard calibration target, and then uses a known distance on the specimen’s surface to calibrate for scale. This provides a very accurate,low cost, and practical solution to what may initially seem like a “large” problem. Implementing this technique demonstrates the robustness of VIC-3D products and the flexibility of the calibration procedure.

Double sided calibration plate target/ Double Sided Targets (35mm – 1.5m)

The double-sided target is used to calibrate two VIC-3D systems facing each other simultaneously. This board allows for relatively easy placement of data from two DIC systems installed face-to-face in the same coordinate system. When your application requires measuring both sides of the same specimen to analyze thickness or necking, a double-sided plate target can simplify the calibration and coordinate system establishment process.

A double sided target is used to simultaneously calibrate two VIC-3D systems facing each other. The target allows DIC data from oppositely mounted systems to be put into a common coordinate system with relative ease. When your application requires the measurement of two sides of the same specimen to analyze thickness or necking, a double sided target simplifies the calibration process.

The manufacturing method of double-sided panel targets is very similar to standard calibration panel targets, ensuring ultra matte surfaces, high rigidity, and durability in various testing environments. They are also separately calibrated at CSI headquarters to ensure measurement accuracy.

Double sided targets are manufactured in much the same way as standard calibration targets to ensure an ultra-matte finish and high rigidity & durability for a multitude of testing environments. They are also individually calibrated at CSI’s headquarters to ensure accurate measurements are achieved.

When the calibration field of view is less than 30mm, the standard calibration plate target will no longer be applicable. This is because the printing resolution of the manufacturing equipment for standard plate targets can no longer meet the accuracy required for small-scale circular dot arrays. In addition, when the field of view is less than 30 millimeters, it is also difficult to image the standard plate target, and there is a lack of necessary hardware to help the plate target tilt and rotate during the imaging process.

When calibrating fields of view smaller than 30mm, standard calibration targets are no longer ideal to use. This is due to the fact that printing devices limit the size of the elliptical markers printed with acceptable resolution. Furthermore, imaging standard targets at fields of view smaller than 30mm can also prove difficult with no other hardware to provide assistance during the tilt and rotation process.

To achieve from0.7 millimeters to 30 millimetersFor small-scale calibration, CSI company provides calibration plate targets made of sodium calcium glass material with laser etching and blue chrome plating. All calibration lattices of glass target plates are made by photolithography process on the blue chrome plating layer. With appropriate backlighting, these plate target lattices will have very clear and sharp edge contours, which remain clear even at high magnification and are compatible with external hardware such as plate target fixation devices and gooseneck positioning arms. Due to the reduced imaging depth caused by higher optical magnification, these external hardware are needed to help maintain the stability of the small plane of the board targetAnd control its tilt range not to exceed the depth of field.

For small scale calibrations from0.7mm to 30mm, Correlated Solutions provides laser etched, blue chrome plated, sodalime glass calibration targets. All glass targets are created through a photo lithography process which creates a plating of blue chrome over the face of the glass plate. With proper backlighting, these targets provide very sharp edges which are clearly seen at high magnifications and are compatible with external hardware, such as target fixtures and gooseneck positioning arms. Since depth of fields decrease at higher magnifications, external hardware is almost always necessary for stabilizing the target for small out-of-plane tilts.

Small scale calibration/ Small Scale Calibrations (8mm – 30mm)

VIC-3DStandard OpticsSystem ApplicationWhen measuring within a field of view range of 8mm-30mm， There is always one of the two glass plate targets provided by CSI that can meet the demand, whether it is a 1 "plate target available20mm-30mmField of view or 4-in-1 board target (left view) available8mm-20mmField of view.

For fields of view from 8mm-30mm on a VIC-3D system with standard optics, one of two glass targets should be used, either the 1″ Target for fields of view 20mm-30mm or the 4-in-1 Target (seen left) for fields of view 8mm-20mm.

These two board targets are usually delivered to the user together, and as shown in the component photo on the left, this also includes the gooseneck positioning arm, mini ball head hinge, and glass target holder. When calibrating a small field of view, using these components in conjunction can maintain the calibration processStability and flexibility.

Both targets are generally provided together and with the assembly seen on the left, which includes a gooseneck positioning arm, a mini-ball head, and a glass target holder. Using these components together will ensure bothstability and flexibilitywhen calibrating small fields of view.

If the sample is 7mm or smaller a standard system can be used, however, a microscope system should be heavily considered in order to take advantage of camera resolution to maximize your test’s potential data points.

Microscopic calibration plate target/ Microscope Calibration Target (0.7mm – 7mm)

For field of view measurements ranging from 0.7 millimeters to 7 millimeters, the VIC-3D microscopy system is required to achieve this. The calibration microscope system is similar to the calibration standard system, but with a smaller scale. The microscope system provides both small-scale field of view measurements andThe two plate targets shown in the left diagram. The microscope is also equipped with a plate target fixing device with backlight illumination to ensure smooth photography during the calibration process from the first to the last deflection of the plate target.

For fields of view from 0.7mm to 7mm, the VIC-3D Microscope system will be needed. Calibrating the Microscope System is similar to calibrating a standard system, but on an even smaller scale. Both of the targets seen to the left are provided with the microscope system for these fields of view. Aback-lit target fixtureis also provided on the microscope to ensure the calibration process goes smoothly from the first tilt to the last.

Due to the complex optical path and high optical magnification, additional steps need to be taken during the calibration process to completely eliminate optical distortions in the microscope system. When conducting 3D DIC measurements under a microscope, this aspect of CSIExclusive Patent ProcessVery important. Without it, the measurement deviation is about 2000 microstrains. During this process, a series of images of the speckle glass plate target need to be captured. By using VIC-3DThe distortion correction function of patentsAnalyze these image groups and then calculate and correct all optical distortions. By utilizing a precision electric 3-axis worktable, this unique optical distortion correction step has become an automated process, saving time and further simplifying the calibration steps.

Due to a complex optical path and high magnification, one additional step needs to be taken in the calibration procedure to completely remove optical distortions from the microscope system. Thisexclusive patented procedureis essential when performing three-dimension DIC under a microscope. Without it, the measurement bias is on the order of 2,000 microstrain. In this step, a sequence of images is taken of a speckled glass target. By analyzing these image groups with VIC-3D’s patented Distortion Correction feature, all distortions are then computed and corrected. With the motorized 3-axis precision stage, this additional Distortion Sequence becomes an automated process, saving time and further simplifying the calibration process.

Infrared calibration board target/ IR Calibration Targets (50mm – 300mm)

If your application requires synchronous full field temperature measurement as well as strain and deformation measurement, the new VIC-3D IR ™ The system may interest you. If you want to add this feature to an existing system, simply add these hardware: infrared camera, lens, and infrared calibration board target.

If your application requiresfull-field temperaturemeasurements alongside strain and deformation measurements, the new VIC-3D IR™ System may be of interest to you. If you’d like to add this capability to an existing system, only a couple pieces of hardware need to be added: a camera, lens, and calibration target(s).

To calibrate the infrared temperature field camera to the VIC-3D system, a calibration plate target that is visible within both the wavelength range of the infrared temperature field camera and the white light range of the DIC camera is required. The simplest method is to use a slightly heated chrome plated glass plate target or a laser etched anodized aluminum plate target. Chrome plated glass plate targets are used to calibrate smaller fields of view, while laser etched aluminum plates are used to calibrate larger fields of view.

To calibrate athermal camerainto the VIC-3D system, a calibration target visible in the thermal camera’s wavelength range and in the DIC cameras’ white light range is needed. The easiest way to achieve this is to use a slightly heated chrome plated glass target or a laser-etched, anodized, aluminum target. The chrome plated glass targets are used to calibrate smaller fields of view and the laser etched aluminum plates are used to calibrate larger fields of view.

Each infrared calibration board target has its own protective jacket. The protective jacket or target label has calibration parameters for the target, such as point distance (mm), number of points x, number of points y, x-offset, y-offset, x-length, and y-length.

Each IR calibration target comes with its own protective case. The case or target displays the target’s calibration parameters, such as pitch (mm), number of dots in x, number of dots in y, offset in x, offset in y, length in x, and length in y.

VDI/VDE 2626 standard board/A4

If your application requires synchronous full field temperature measurement as well as strain and deformation measurement, the new VIC-3D IR ™ The system may interest you. If you want to add this feature to an existing system, simply add these hardware: infrared camera, lens, and infrared calibration board target.

If your application requiresfull-field temperaturemeasurements alongside strain and deformation measurements, the new VIC-3D IR™ System may be of interest to you. If you’d like to add this capability to an existing system, only a couple pieces of hardware need to be added: a camera, lens, and calibration target(s).

To calibrate the infrared temperature field camera to the VIC-3D system, a calibration plate target that is visible within both the wavelength range of the infrared temperature field camera and the white light range of the DIC camera is required. The simplest method is to use a slightly heated chrome plated glass plate target or a laser etched anodized aluminum plate target. Chrome plated glass plate targets are used to calibrate smaller fields of view, while laser etched aluminum plates are used to calibrate larger fields of view.

To calibrate athermal camerainto the VIC-3D system, a calibration target visible in the thermal camera’s wavelength range and in the DIC cameras’ white light range is needed. The easiest way to achieve this is to use a slightly heated chrome plated glass target or a laser-etched, anodized, aluminum target. The chrome plated glass targets are used to calibrate smaller fields of view and the laser etched aluminum plates are used to calibrate larger fields of view.

Each infrared calibration board target has its own protective jacket. The protective jacket or target label has calibration parameters for the target, such as point distance (mm), number of points x, number of points y, x-offset, y-offset, x-length, and y-length.

Each IR calibration target comes with its own protective case. The case or target displays the target’s calibration parameters, such as pitch (mm), number of dots in x, number of dots in y, offset in x, offset in y, length in x, and length in y.