"Metrology is the science of measurement, including theoretical and experimental conclusions at any level of uncertainty in every area of science and technology." Without a doubt, metrology is the foundation of all practical scientific endeavors. Metrology is crucial because of practically every aspect of daily life—including practical science, technology, and engineering. It also consists of the measurements whether it’s video measurements, wire loop height measurements, Die location measurements, or Die shift measurements. Let’s give a broad look at some features of Optical metrology.
Why Wire loop height measurement is important in metrology? A technique and a tool for wire loop height measurements are provided by the invention. The measurement point on the wire loop is placed over a height gauge device. The density of wires used to attach an integrated circuit (IC) chip to a lead frame or packaging board is growing as electronic equipment gets thinner. Multiple chips that are stacked in a package are now connected via a method called wire bonding. In order to help ensure that IC chips fit into packaging as small as a few millimeters thick, it is crucial to control the height and shape of the wire loops that are created during wire bonding. The height gauge device emits incident light to illuminate the location. The height gauge device receives the reflected light created by the incident light, and a processor connected to the height gauge device estimates the height of the said point in relation to a reference surface using a characteristic of the reflected light.