What Is a Monochromator?
monochromator
monochromator
Right!
- Chinese name
- monochromator
- Foreign name
- monochromator
- Attributes
- Monochromatic light components in spectrometers
- Album structure
- Spectrum spectrograph
- monochromator
- A component of a spectrometer that produces monochromatic light.
- The structure of the monochromator is similar to that of the spectrograph. It separates a series of narrow-band electromagnetic radiation from a wide-band radiation beam. It replaces the photosensitive plate on the focal plane of the spectrograph with an exit slit. There are prism monochromator and grating monochromator.
- The grating monochromator is widely used. In research, production, quality control and other links. Whether it is transmission absorption spectrum, fluorescence spectrum, Raman spectrum, how to obtain single wavelength radiation is an indispensable means. Since modern monochromators can have a wide spectral range (UV-IR), high spectral resolution (up to 0.001nm), automatic wavelength scanning, complete computer control functions are easily integrated with other peripheral devices into a high-performance automatic test system The use of a computer to automatically scan a multi-grating monochromator has become the first choice for spectral research.
- When a beam of composite light enters the entrance slit of the monochromator, it is first focused by the optical collimator lens into parallel light, and then dispersed by the diffraction grating to separate wavelengths (colors). With each wavelength leaving the grating at a different angle, the focusing slit is used to re-image the exit slit. Computer control can precisely change the emission wavelength.
- A typical system is as follows:
- The working principle of the planar grating monochromator is that the light emitted by the light source uniformly illuminates the incident slit S1, which is located on the focal plane of the off-axis parabolic lens. The light is irradiated onto the grating in parallel through M1, and returns to M1 after being diffracted by the grating. The light reflected by M1 is condensed on the exit slit of S2 through M2, and finally shines on the photoelectric receiving element. Due to the diffraction effect of the grating, the light coming out of the exit slit is monochromatic light. When the grating rotates clockwise, the light coming out of the exit slit appears in order from short wave to long wave. This optical system is called a Litlow-type optical system.