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The main function of a unidirectional caliper is to measure outer diameter, as we all know. In addition to diameter, it can also measure dimensions such as width, thickness, slit width, depth, and concentricity. Below, we will focus on its ability to measure slit width. Unidirectional caliper: http://www.bdlanpeng.com/repository/image/gkGzTycQTTCsPgI7hfcWIQ.jpg The emitting lens contains a point light source; the light emitted by this source passes through a lens system (i.e., a set of lenses) to produce a collimated parallel light field. Collimated parallel light is directed directly at the receiving lens, where it is focused after passing through the lens system inside the receiving lens. It then passes through an aperture located at the focal point, thereby forming an image on the CCD chip. The CCD chip is the photoelectric conversion element in the probe component, capable of converting the received light signals into electrical signals. The electrical signal is received and amplified by the signal acquisition circuit, digitized, and then transmitted to the upper-level computer. When an object in the field of view blocks the outer part of the parallel light beam, the unblocked area forms a slit. The parallel light beam passing through this slit creates a distinct bright band on the CCD, with a length of L. The width W of the slit can be calculated using L. Measurement schematic: http://www.bdlanpeng.com/repository/image/4_Pqa-wuQ5217Kss9DWXYg.jpg Using this method, the unidirectional diameter meter can be applied for online detection of slit dimensions; it enables real-time measurement of the slit values, which are then displayed. It facilitates the detection of slits.