How to Choose Bi-Telecentric Lenses in Vision Projects

In the field of machine vision, the performance of lenses plays a crucial role in the accuracy and reliability of detection results. Ordinary FA lenses possess an inherent characteristic of varying image sizes based on distance, akin to a hidden "double-edged sword", which often diminishes the precision of detection in meticulous tasks. This parallax phenomenon is like a thin veil shrouding the detection data, bringing numerous challenges to precise measurement and analysis.

Bi-Telecentric Lens: The Precise Visual Master

In addressing this challenge, the Bi-telecentric lens emerges as an adept "correction master" of vision. With its unique optical design, akin to a cleverly constructed "bridge" of light paths, it ensures that light rays entering and exiting the optical system remain parallel to the optical axis. This distinctive design is like a magical "wand" that, with a wave, ensures a constant magnification rate for the surface of the object captured by the Bi-telecentric lens. As such, it dispels the "haze" caused by parallax, thoroughly resolving the precision detection issues associated with it.

Moreover, the Bi-telecentric lens acts as a diligent "light guardian," effectively preventing stray light from intruding. This characteristic significantly increases the edge sharpness of the measured object, as if delineating clear and distinct "lines" for the image contour, paving a smooth "road" for subsequent image processing, and greatly enhancing the accuracy and efficiency of data handling.

Scenarios for Using Bi-Telecentric Lenses

In practical applications, Bi-telecentric lenses play an indispensable role in critical fields such as precision measurement and defect detection, becoming a reliable assistant in the pursuit of high-precision detection across various industries. When facing complex detection tasks and choosing Bi-telecentric lenses, multiple dimensions typically need to be considered:

When the object to be inspected has significant thickness and requires precise detection across more than one plane, such as everyday items like food boxes and beverage bottles. These objects are not single-plane structures; ordinary lenses would encounter parallax issues when dealing with planes of different depths, leading to measurement data deviations. The Bi-telecentric lens, however, can ensure precise detection data across various planes due to its consistent magnification advantage, like a precise "measuring ruler" tailored for multi-plane detection tasks.

When the placement position of the object to be measured is uncertain and may form a certain angle with the lens. Such angle variation can cause severe image deformation and measurement errors for ordinary lenses, similar to a vehicle struggling to maintain a stable trajectory on a rugged road. However, the Bi-telecentric lens acts like a steady "navigator," unaffected by angle changes, maintaining accurate imaging and measurement effects, and providing reliable image data support for detection work.

When the object being measured is in an unstable state of vertical motion during detection, such as the frequent distance changes caused by vibrations on a production line. Ordinary lenses would experience significant imaging quality degradation and fluctuating measurement results due to working distance variations. Meanwhile, the Bi-telecentric lens, like an unyielding "Sea-Stabilizing Needle," can effectively eliminate measurement errors caused by object distance changes, ensuring stable and precise detection results even in dynamic environments, supporting the efficient and stable operation of production lines.

For objects with apertures or three-dimensional shapes that present complex situations. The structural uniqueness of these objects makes it difficult for ordinary lenses to comprehensively and accurately capture their characteristic information, often leading to partial distortion or inaccurate measurements. The Bi-telecentric lens, however, with its excellent optical performance, works like a skillful "sculptor," meticulously presenting the true form and size of the object, providing strong technical support for the detection of complex objects.

When detection tasks demand low distortion rates and uniform brightness in image effects. Ordinary lenses often struggle to avoid distortion phenomena during imaging, and ensuring uniform image brightness is challenging. It's akin to a painting with twisted lines and patchy colors. The Bi-telecentric lens, however, through its special optical design and light control, can create an almost distortion-free and uniformly bright "visual painting," providing an ideal foundation for high-precision image analysis and measurement.

In situations where specific directional parallel lighting is required to detect defects. The Bi-telecentric lens can perfectly combine with a parallel lighting system, like a harmonious "partnership," accurately capturing defect information. This prevents defect omission or misjudgment caused by mismatches between lighting angles and lens imaging characteristics, greatly enhancing the accuracy and reliability of defect detection.

When detection tasks demand extremely high precision, such as an allowable error of only 1um. Ordinary lenses often fall short when facing such stringent precision requirements, where even the smallest errors could render detection results invalid. The Bi-telecentric lens, however, like a high-precision "measuring microscope", can meet ultra-precise detection needs, providing solid technical backing for microscopic measurement and quality control in high-end manufacturing, scientific research, and other fields.

In conclusion, the Bi-telecentric lens acts as a precise "error eliminator", capable of thoroughly eliminating measurement errors caused by object distance changes, laying a solid foundation for the high-precision operation of measurement systems. It ensures that each measurement accurately reflects the true size and characteristics of the object, shining brightly on the stage of precision visual detection and leading the industry toward higher precision and more reliable detection methods.