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Spectral analysis using DMD

Spectral analysis is a powerful non-contact technology that can quickly identify the composition and related characteristics of substances by analyzing the absorption or reflection changes of different wavelengths of light in the entire spectrum.
Spectral analysis identifies a substance and determines its chemical composition and relative content based on its spectrum. According to analysis principles, spectral analysis can be divided into emission spectrum analysis and absorption spectrum analysis. Spectral analysis can support visible, infrared, or UV wavelengths.
When the light source is irradiated onto the DMD array through a light splitting grating, the DMD micromirror can be used as a light splitting filter. This DMD consists of hundreds of thousands to millions of extremely small micro mirror arrays. The unique architecture of DLP DMD is easy to form a spectrometer structure, and can replace expensive array detectors with larger single detectors, while still providing a reliable optical platform.

Why choose DLP technology for spectral analysis

All molecules have a unique response to different wavelengths of light. Spectral analysis is an analytical method that uses these unique answers to identify and describe materials. In spectrometer design, the TI DLP digital micromirror device (DMD) can be used as a programmable wavelength selector. All broadband light sources pass through an optical slit. The light at each wavelength is then dispersed onto the micromirror array using a diffraction grating or prism, allowing a subset of the micromirror array to be mapped to a specific wavelength. You can then switch the light at a specific wavelength to a single element detector. This powerful design architecture eliminates the need for linear array detectors or motors to generate spectral scanned wavelength ranges, resulting in higher performance and smaller package sizes for chemical analysis at lower cost.

Schematic diagram of the principle of DLP technology in spectral analysis