Spectrum, the full name of the optical spectrum, is a complex color light through the dispersion system (such as prisms, gratings) after the dispersion of light, the dispersed monochromatic light according to the size of the wavelength (or frequency) and the sequential arrangement of the pattern. Spectrum is not only the distribution of visible light, but also includes ultraviolet, infrared and other multi-wavelength information. Spectral information is unique, like the optical "DNA" of a substance, each substance has its own unique spectral characteristics.

Spectroscopy is useful in several ways:

Substance Identification: The type of substance can be identified by comparing the spectrum emitted, absorbed, or reflected by the substance with the spectrum of a known substance. Historically, scientists have discovered many new elements, such as rubidium, cesium and helium, through spectral analysis.

Component Analysis: The intensity distribution of a spectrum reveals the proportions and concentrations of the components of a substance, which is useful for the analysis of chemical compositions.

Study of the structure of matter: By analyzing specific patterns in a spectrum, the structure and state of motion of atoms or molecules within a substance can be inferred.

The spectral focusing thickness measurement system plays an important role in the thickness measurement of the back cover of a cell phone. The system mainly utilizes the principle of spectral imaging, i.e., the properties of an object in terms of absorption, reflection and transmission of light of different wavelengths. When light strikes the surface of the back cover of a cell phone, part of the light is reflected by the surface of the back cover, part of the light is absorbed, and part of the light may penetrate the back cover. By measuring the reflection, absorption, and transmission spectra of these lights at different wavelengths, the spectral focusing thickness measurement system is able to obtain information about the spectral characteristics of the back cover of the cell phone.

Further, by processing this spectral data using specific algorithms and software, the thickness of the back cover of the cell phone can be calculated. Due to the uniqueness of the spectral information, this measurement method has high accuracy and reliability. In addition, the spectral focusing thickness measurement system has the advantage of non-contact measurement, which can avoid causing damage to the back cover of the cell phone, and at the same time adapt to different materials, colors and surface roughness of the back cover.

The application of POMEAS Spectral Focus Thickness Measurement System in the thickness measurement of cell phone back covers combines spectral imaging technology and image processing technology to realize accurate, fast and non-destructive measurement of the thickness of cell phone back covers, which meets the needs of the cell phone manufacturing industry for high-quality parts.