Detailed explanation of the field of view in the optical imaging of the image measuring instrument.

Field of View (FOV) refers to the physical size range of the object that the system can observe, that is, the size of the object corresponding to the largest image formed on the CCD chip., The size of the CCD chip is related to the optical imaging schematic diagram as shown in the figure below. Without using the close-up ring, the relationship between the four parameters can be expressed by the following proportional expressions.

For example, the vertical (or horizontal) length of the field of view FOV{v or h) is equal to

Assuming the focal length is 16mm, the vertical size of the 1/3-inch CCD chip is 3.6mm, if the working distance is 200mm, the vertical field of view is equal to 45mm, as shown in the following figure: