Concept of Telecentric Lens Magnification

The magnification of a telecentric lens is the degree of magnification or reduction through the lens, which can be calculated from the ratio of the object distance to the image distance, i.e. Lens Magnification = Image Distance / Object Distance. Telecentric lenses ensure that objects are imaged at the same size at different distances, so their magnification corresponds directly to the ratio of image enlargement.

Relationship between telecentric lens magnification and imaging accuracy 

Affects Resolution: The magnification of a telecentric lens affects the resolution of the imaging system. Ideally, the precision of a single pixel can be thought of as the number of image elements on the sensor occupied by the smallest object detail that the telecentric lens can resolve. As the magnification of the telecentric lens is increased, the resolution of the imaging system may increase as more details are magnified and projected onto the image sensor's image elements. However, this also depends on the resolution of the image sensor and the size of the image elements.

Impact on measurement accuracy: In high-precision measurement systems, the magnification of the telecentric lens has a direct impact on the accuracy of the measurement results. If the magnification of the telecentric lens is inconsistent or in error, then the measurement results will also be affected. Therefore, when designing and using telecentric lenses, you need to ensure the consistency and accuracy of the magnification.

Affects the size of the field of view: The magnification of a telecentric lens also affects the size of the field of view. Generally speaking, the larger the magnification, the smaller the field of view; the smaller the magnification, the larger the field of view. Therefore, when choosing telecentric lenses, you need to choose the appropriate magnification according to the needs of the actual application scene.

Other factors affecting imaging accuracy

1. Telecentricity: Telecentricity refers to the angle of deviation of the optical axis of a telecentric lens from the center of the field of view. If the telecentricity is high, it will lead to different imaging magnification at the center and edge of the field of view, thus affecting the measurement accuracy and image quality.

2. the quality of the optical system: including the manufacturing accuracy of the lens, material selection and coating technology will affect the image quality.

3. the performance of the image sensor: the resolution of the image sensor, the size of the pixel, and the noise level, etc. will also affect the imaging accuracy.

4. lighting conditions: appropriate lighting conditions can improve the image quality, and vice versa, may lead to blurred images or reduced contrast.

The magnification size of the telecentric lens directly affects the resolution, measurement accuracy and field of view size of the imaging system, while factors such as telecentricity, quality of the optical system, performance of the image sensor and illumination conditions also have a significant impact on the imaging accuracy.