With technological advancements, the precision requirements for measuring various workpieces and components have become increasingly stringent, placing ever-greater demands on measuring instruments. Non-contact optical measuring instruments represent a revolutionary leap forward from traditional measurement techniques, emerging as the perfect fusion of conventional projection methods and computer technology. As a new term in today's industrial inspection and metrology field, these instruments embody the integration of digital technology into industrial inspection and measurement, enabling advanced spatial geometric calculations.

Non-contact optical measuring instruments are built upon CCD digital imaging technology, leveraging the powerful software capabilities of computer screen measurement techniques and spatial geometric calculations. When equipped with specialized control and graphical measurement software, the computer transforms into the software-driven “measuring brain”—the core of the entire system. It rapidly reads displacement values from optical non-contact scales. Through software module calculations grounded in spatial geometry, it instantly produces results and generates graphical representations on the screen. This allows operators to visually compare images, intuitively identifying potential measurement deviations. All these processes occur in real time, powered by today's formidable computing capabilities, happening so swiftly the operator remains unaware. Only such precision instruments—capable of utilizing CCD digital images and computer software calculations to meet complex measurement demands—constitute true non-contact optical measuring instruments.

Evidently, within non-contact optical measuring instruments, computers perform more than simple image alignment and numerical display. Crucially, they execute fundamental functions including spatial geometric calculations, graphical display, dimensional annotation, and CAD graphic comparison. All these capabilities rely on specialized measurement and control software developed on the foundation of spatial geometry.