Projector is a kind of instrument commonly used to measure length, diameter, distance, outline and other dimensions, and its measurement accuracy directly affects the quality and production efficiency of products. Here is a high-precision measurement method.

First of all, we should ensure that the reference point, objective lens and plane glass of the projector are in the center of the whole measurement system, and optimize the image quality by adjusting the optical elements.

Then, according to the size, shape and surface roughness of the measured object, the appropriate projection mode is selected. For example, for a circular object with a small diameter, a coupled light source (transmission light source) can be selected to ensure a clear image.

Next, measure the actual size of the standard measuring tool (such as micrometer and vernier caliper) and the scale of the projector, and put it on the projector. Enlarge and adjust the image until it matches the actual measurement results.

Then, measure the measured object in the same way and put it on the projector in the same proportion. In this process, it is necessary to ensure that the position, orientation and throwing method of the measured object are the same as those of the standard measuring tool, and then measure on this basis.

Finally, the measurement result of the object to be measured is compared with the measurement result of the standard measuring tool, and the error is corrected to obtain a high-precision measurement result.

Generally speaking, projectors need to pay attention to the adjustment of optical elements, the choice of projection mode, the use of real standard measuring instruments and the accuracy of scales to ensure the most accurate measurement results.