Such concave mirrors—precisely formed glass surfaces coated with a reflective film of metal—are used in spectroscopic instruments to gather light from a sample onto a diffraction grating that then splits the light into its spectral components for analysis. The new scanning mirror micro spectrometer (SMMS) platform developed at Fraunhofer IPMS is based on a single-axis MEMS (micro electro-mechanical system) scanning mirror. It aims for applications in the near infrared (NIR) spectral range up to a wavelength of 1900 nm, 2200 nm or 2500 nm. A spectrometer can be designed and built with a variety of optical configurations. These include the Littrow configuration, the Ebert-Fastie configuration, the Czerny-Turner configuration, and the concave aberration-corrected holographic grating configuration. Many of these configurations are also. Compact and ultra-compact systems for nearinfrared (NIR) spectral analysis enabling the integration into portable devices or even mobile phones may contribute signifi cantly to the development of future systems for sensing and testing applications. The angle of this mirror can be adjusted. This guide provides some simple and easy to use design guidelines and formulas for designing, evaluating and comparing various diode array, diffraction grating based spectrometers designs The input to the design process is the wavelength range you want to cover and the optical resolution by which. Why is a mirror used instead of a lens? In instruments that use light, like an FTIR, it is necessary to process light in various ways, such as focusing it or forcing its rays to travel in parallel. You may think of lenses as objects used for these purposes.
