Oasis Inspection Systems
The OASIS is a premier optical profile inspection system that combines accuracy and precision with a fast, easy to use operator interface created by George Products Company, Inc.
The Oasis works by utilizing an LED light source to collimate
precise rays through a series of specially designed diffusers and
lenses that shine across the part to be inspected. That image is
then captured by a very specific telecentric optical lens, which
results in a perfect monochrome
profile of the inspected part. The part profile is then digitally captured with a specially designed camera system and transferred to the custom onboard computer where the software does the rest. The image is analyzed and measurement data is displayed on-screen.
The Oasis operates by casting a "Shadow" of a part to be inspected and capturing that image in a digital format to be analyzed by an on-board computer. The powerful software behind the scenes converts the captured image into real dimensional data that measures the part to an accuracy of 0.0002-inches!
When a part is placed in the Oasis, the user will see a digital image of the profile of the part to be inspected. Oasis can search and automatically find the appropriate part inspection program that includes the dimensions the user wishes to measure. The Oasis captures images in real-time, so regardless of the number of dimensions, every time another part is placed into the Oasis, each and every measurement is simultaneously and instantly updated.
The software also includes a color-coded display panel that shows the actual measured dimension and the user defined upper and lower limits (tolerances). Pass/Fail indications are easily identifiable for all measurements.
The Oasis features built-in quality control inspection reporting. Measurements taken by the Oasis are recorded in the unit as parts are inspected. Those dimensions can be imported into the Oasis Inspection Reporting feature which will create a custom report that can be printed or saved in the Oasis for future retrieval. The Quality Control report can be created for the dimensions of a single inspected part or for a group of parts in an entire production nun.
- Continuous Image Acquisition for Instant Measurements
- Simultaneous Measure of Multiple Dimensions
- File Linking
- Non-Contact Operation
- Accurate to +/- 0.0001 inches
- Precision Optics
- Powered by User-Friendly, Full-Featured Software
- Measured Dimensions Saved in the OASIS
- Includes Automatic Inspection Reporting
- Quality, Robust Construction
- Complete Turn-Key Package - Ready to Run!
HOW OASIS WORKS
The OASIS operates by casting a "Shadow" of a part to be inspected and capturing that image in a digital format to be analyzed by an on-board computer.
The powerful software behind the scenes converts the captured image into real dimensional data that measures the part to an accuracy of 0.0001-inches!
The process starts when the operator places a part to be measured into the inspection zone of the OASIS. Take a look at the image below...
- Select a part inspection program...
- Oasis can analyze the part's shape and find the
- Place the part in the inspection zone...
- All measurements are instantly displayed on the screen.
- Oasis will store all the measurements
- You can print a QC report or move on to the next part!
The result – Fast, Accurate inspection of your parts. This fully automated non-contact video inspection system is lightning fast and will simultaneously measure multiple dimensions; all in an instant. Our combination of an engineered light source, precision optics, and powerful programming come together to yield an accuracy of 0.0001-inches
SOFTWARE TOOLS & PROGRAMMING
The first time that you inspect a part, you'll have to tell the OASIS which dimensions you want to measure and what the nominal dimension is supposed to be - including adding tolerances so the OASIS can automatically give you not only the actual measurement, but also a Pass/Fail indication and inspection report!
Dimensioning tools are provided to perform various types of measurements. You can drag-and-drop the tools and position them anywhere on the profile image of the part to be inspected. The available tools are shown below...
Each tool can be set with a nominal dimension as well as warning and tolerance limits. The measurements are also shown on the color-coded Status Display Panel. See image above..
Accuracy testing was performed by using the OASIS to measure the diameter of 0.3750" dia gage pins. The testing was performed using 10 Parts, 3 Trials, and 3 Operators. The Parts and Operators were sequenced in random order.
Following are the results of the testing:
- Accuracy = 0.0001" (2.54 microns)
- Repeatability = 0.0001" (2.54 microns)
- Reproducibility = 0.00004" (1.02 microns)
- Resolution = 0.0001" (2.54 microns)
NOTE: These are total values, NOT +/- values.
Speed, Accuracy, Reliability...
These are the features of the OASIS that make it a leader of the pack in the Optical Inspection industry. Don't forget to add Functionality to that list!
Now that you have your data, you want to be able to do something with it! The OASIS includes data acquisition and inspection reporting that's as easy as 1, 2, 3.
1. Acquire the part measurement and save it in the OASIS...
2. Open the built-in reporting program and import your data...
3. Print the inspection report, and/or save it in the OASIS.
Example Report Below...
The optical system is one of the most important components in providing accurate measurements. The video processor relies on a quality and exact image to detect edges with a high degree of accuracy. The OASIS optical system provides the following features:
Ultra Low Distortion - 0.02% Maximum
Round Edge Compensation
Ultra Low Distortion
The ultra low distortion of the OASIS optical system permits accurate measurements anywhere within the field of view.
In other systems that have higher optical distortion, the same measurement may appear larger or smaller in different areas of the screen. Systems with higher distortion require the use of a master grid to measure the error and compensate for it. With Ultra Low Distortion, the Oasis requires no such compensation, providing absolute accuracy.
As the ambient temperature varies, the distance between elements of the optical system changes because of the slight expansion of the metal holding it together. This expansion can cause changes in magnification, focus and distortion, which ultimately affect the accuracy of the measurements.
The OASIS employs a temperature compensated optical system that minimizes the effects of temperature variations to a negligible level, providing accurate results over a broad range of operating temperatures.
Standard lenses have a conical field of view, such that objects appear to be smaller when they are farther away from the camera and larger as they get closer. This means that in order to get exact measurements, the part must be positioned exactly at the focal plane of the lens. Furthermore, if the edges are not at the same focal plane, errors due to magnifications will result.
The OASIS uses telecentric optics, which means that the image is formed only by rays that are perpendicular to the lens. The size of the image is not dependent of the distance to the object. Therefore, accurate readings can be guaranteed for a part position positioned anywhere in the Inspection Zone of the Oasis.
Round Edge Compensation
Edges produced by round surfaces are difficult to image accurately. There are many reasons for this effect, but the worst offender is light reflecting at an angle of the rounded surface that makes it appear smaller than it really is. The error of this effect varies with part position and surface radius, making it almost impossible to compensate for electronically.
A possible alternative would be to use collimated light (a light source that produces a light beam of parallel rays) to eliminate this effect. This works well, but unfortunately it creates a new problem: diffraction. As the parallel rays pass through the edge, they are diffracted into several small angle rays that cause interference fringes at the camera. The interference fringes make it virtually impossible to determine an exact edge position within a pixel.
The OASIS solves these challenges with its Round Edge Compensation technology. The light source of the Oasis produces a beam of light that is collimated in nature, but produces limited angle rays that eliminate the diffraction problems created by pure collimated light.
The result - the Oasis is capable of accurately detecting the edges, and therefore the dimensions, of even the most challenging part profiles.