Theory and Method
The IVP-100 uses transmitted contour illumination to create a precise shadowgraph image of the part under inspection. A green LED light source beneath the stage transmits light upward through the glass table and the part's cross-section. Where the part blocks the light, the camera sees a dark silhouette; where light passes freely, the background is bright. This high-contrast boundary gives the image-processing software a clearly defined edge to locate and measure.
The dual-axis telecentric lens system underpins the measurement accuracy of this image-based approach. A telecentric lens keeps principal light rays parallel to the optical axis, so magnification stays constant regardless of where the part sits within the depth-of-field range. This eliminates the perspective error that affects conventional imaging lenses, where objects at different heights appear at slightly different sizes. The result is measurement accuracy held to ±8 μm and repeatability of 5 μm across the full 115 × 75 mm measuring field.
The IVP-100 captures the full measuring field in a single image pass, the defining characteristic of a flash measurement system. The 20 MP camera records the complete silhouette, and edge-detection software identifies geometric elements such as circles, lines, arcs, and angles. A white LED ring light supplements the green contour source to handle surface-reflective parts.
When the system recognizes a stored part, it calls the corresponding program and outputs the measurement report automatically.
